acronyms.comp revision 1.243
1$NetBSD: acronyms.comp,v 1.243 2019/04/10 10:57:51 sevan Exp $ 23WHS three-way handshake 38VSB 8-state vestigial side band modulation 4AA anti-aliasing 5AAA authentication, authorization, [and] accounting 6AAT average access time 7ABI application binary interface 8ABNF augmented backus-naur form 9ABR available bit rate 10ABRT automatic bug reporting tool 11AC alternating current 12ACI adjacent channel interferer 13ACID atomicity, consistency, isolation, durability 14ACK Amsterdam compiler kit 15ACK acknowledgement 16ACL access control list 17ACL active current loop 18ACL asynchronous connection less 19ACP auxiliary control {process,program} 20ACPI advanced configuration and power interface 21ACS access control set 22ACU automatic calling unit 23ADB Apple desktop bus 24ADC analog [to] digital converter 25ADD acronym driven development 26ADO active data objects 27ADP automatic data processing 28ADPCM adaptive differential pulse code modulation 29ADS alternate data stream 30ADSL asymmetric digital subscriber line 31ADT abstract data type 32AER advanced error reporting 33AES Advanced Encryption Standard 34AFP Apple Filing Protocol 35AFS Andrew File System 36AGC automatic gain control 37AGP accelerated graphics port 38AI analog input 39AI artificial intelligence 40AL access list 41AL active link 42ALE address latch enable 43ALS ambient light sensor 44ALU arithmetic and logical unit 45ALUA asymmetric logical unit access 46AM access method 47AM alignment mask 48AM amplitude modulation 49AMD Advanced Micro Devices Inc 50AMDD Agile model-driven development 51AMI alternate mark inversion 52AMP asymmetric multiprocessing 53AMQP advanced message queuing protocol 54AMT active management technology 55AN Arabic number 56ANR application not responding 57ANSI American National Standards Institute 58AO analog output 59AOL Alert-on-LAN 60AOS add or subtract 61AP access point 62AP application processor 63API application programming interface 64APEI ACPI platform error interface 65APIC advanced programmable interrupt controller 66APIPA automatic private IP addressing 67APM advanced power management 68APM application performance management 69APU accelerated processing unit 70APT advanced persistent threat 71AQM active queue management 72ARAT always running APIC timer 73ARC adaptive replacement cache 74ARC Advanced RISC Computing 75ARC automatic reference counting 76ARM Advanced RISC Machines 77ARP Address Resolution Protocol 78ARPA Advanced Research Projects Agency 79ARQ automatic repeat request 80ARR address range register 81ARU audio response unit 82AS autonomous system 83ASA Adaptive Security Appliance 84ASAN Address Sanitizer 85ASC advanced smart cache 86ASCII American Standard Code for Information Interchange 87ASD agile software development 88ASE advanced software environment 89ASF alert standard format 90ASIC application-specific integrated circuit 91ASK amplitude shift keying 92ASLR address space layout randomization 93ASN autonomous system number 94ASP active server pages 95ASP auxiliary storage pool 96ASPM active state power management 97ASQ automated software quality 98ASR address space register 99AST abstract syntax tree 100AST asynchronous system trap 101AT access time 102AT advanced technology 103ATA advanced technology attachment 104ATAPI advanced technology attachment packet interface 105ATC address translation cache 106ATM asynchronous transfer mode 107ATX advanced technology extended 108AV anti virus 109AVB audio video bridging 110AVL Adelson-Velsky-Landis 111AVX advanced vector extensions 112BA byte align 113BAL basic assembly language 114BAR base address register 115BBS bulletin board system 116BCC blind carbon copy 117BCD binary coded decimal 118BCR byte count register 119BCS base configuration space 120BD baud 121BDD binary decision diagram 122BDI bit deinterleave 123BDUF big design up front 124BEDO burst extended data output 125BER basic encoding rules 126BER bit error {rate,ratio} 127BERT boot error record table 128BFD binary {file,format} descriptor 129BFKL big fscking kernel lock 130BFS breadth-first search 131BFT binary file transfer 132BGA ball grid array 133BGP Border Gateway Protocol 134BGPSEC BGP Security 135BIND Berkeley Internet Name Daemon 136BIOS Basic Input/Output System 137BIOS built-in operating system 138BIST built-in self-test 139BIU bus interface unit 140BKDG BIOS and kernel developer's guide 141BLAS basic linear algebra subprograms 142BLC back light control 143BLOB binary large object 144BM bus master 145BMC baseboard management controller 146BMIC bus master interface controller 147BN boundary neutral 148BNF Backus-Naur form 149BO binary output 150BOF beginning of file 151BOM beginning of message 152BOM byte order mark 153BP base pointer 154BP boot processor 155BPB BIOS parameter block 156BPDU bridge protocol data unit 157BPF Berkeley Packet Filter 158BPI bits per inch 159BPM business process modelling 160BPS bits per second 161BPSK binary phase shift keying 162BQS Berkeley quality software 163BRE basic regular expression 164BS backspace 165BS binary sequence 166BSA basic service area 167BSD Berkeley Software Distribution 168BSDP Boot Service Discovery Protocol 169BSF bit scan forward 170BSOD blue screen of death 171BSP binary space partition 172BSP board support package 173BSP bootstrap processor 174BSR bit scan reverse 175BSS basic service set 176BSS block started by symbol 177BSSID basic service set identifier 178BT BitTorrent 179BT Bluetooth 180BT bit test 181BTC bit test [and] complement 182BTM bus transport mechanism 183BTR bit test [and] reset 184BTS bit test [and] set 185BTS bug tracking system 186BW bandwidth 187BWM block-write mode 188BUAG big ugly ASCII graphic 189CA certificate authority 190CAD computer-aided design 191CAM computer assisted manufacturing 192CAM conditional access module 193CAM content addressable memory 194CARP Common Address Redundancy Protocol 195CAS column address strobe 196CAS compare and swap 197CAS computer algebra system 198CASE computer aided software engineering 199CAU control access unit 200CAV constant angular velocity 201CBC cipher block chaining 202CBR constant bit rate 203CC carbon copy 204CCD charge coupled device 205CCI co-channel interferer 206CCNUMA cache-coherent non-uniform memory access 207CD cache disable 208CD compact disc 209CDDA compact disc digital audio 210CDL compiler description language 211CDMA code division multiple access 212CDP Cisco Discovery Protocol 213CDRAM cache dynamic random access memory 214CER canonical encoding rules 215CF compact flash 216CFB cipher feedback 217CFG context-free grammar 218CFG control-flow graph 219CFI control-flow integrity sanitizer 220CG control gate 221CGA Color Graphics Adapter 222CGI common gateway interface 223CGN Carrier-Grade NAT 224CHAP Challenge-Handshake Authentication Protocol 225CHS cylinder/head/sector 226CI continuous integration 227CI {common,component} interface 228CIDR Classless Inter-Domain Routing 229CIF common intermediate format 230CIFS Common Internet File System 231CIL common intermediate language 232CIR carrier-to-interference ratio 233CIS contact image sensor 234CISC complex instruction set {computer,computing} 235CJK Chinese, Japanese, [and] Korean 236CLF common log format 237CLI command line interface 238CLR common language runtime 239CLTT closed loop thermal throttling 240CLUT color look-up table 241CLV constant linear velocity 242CM configuration management 243CMA concert multithread architecture 244CMC chassis management controller 245CMC corrected machine check 246CMS {configuration,content,course} management system 247CMI control {management,method} interface 248CMOS complementary metal-oxide-semiconductor 249CMP chip multi-processing 250CMS content management system 251CMYK cyan magenta yellow black 252CN {common,canonical} name 253CNC computer numerical control 254CNR carrier-to-noise ratio 255COF current operating frequency 256COFDM coded orthogonal frequency division multiplexing 257COFF common object file format 258COM component object model 259COM computer on module 260COMA cache-only memory architecture 261CORBA common object request broker architecture 262COS class of service 263COW copy-on-write 264CP continuous pilot 265CPB core performance boost 266CPC central processor complex 267CPC cpu performance counters 268CPE common phase error 269CPE common platform enumeration 270CPER common platform error record 271CPG clock pulse generator 272CPI cycles per instruction 273CPL current privilege level 274CPLD complex programmable logic device 275CPP C preprocessor 276CPS characters per second 277CPT command pass through 278CPU central processing unit 279CR carriage return 280CRC cyclic redundancy check 281CRL carrier recovery loop 282CRLF carriage return line feed 283CRT cathode ray tube 284CRUD create, read, update, and delete 285CS cable select 286CS chip select 287CS code segment 288CS computer science 289CSDL {common,conceptual} schema definition language 290CSI channel state information 291CSI common system interface 292CSMA carrier sense multiple access 293CSMA/CA carrier sense multiple access with collision avoidance 294CSMA/CD carrier sense multiple access with collision detection 295CSR control [and] status registers 296CSRG Computer Systems Research Group 297CSS cascading style sheets 298CSV comma-separated values 299CTF compact c type format 300CTM close to metal 301CTR counter [mode] 302CTS clear to send 303CUA common user access 304CUT coordinated universal time 305CV control voltage 306CVE common vulnerabilities and exposures 307CVS Concurrent Versions System 308DA destination address 309DAA distributed application architecture 310DAB digital audio broadcasting 311DAC digital [to] analog converter 312DAC discretionary access control 313DAD duplicate address detection 314DANE DNS-based Authentication of Named Entities 315DAO disk at once 316DAP Directory Access Protocol 317DAT digital audio tape 318DAT dynamic acceleration technology 319DB database 320DBA database administrator 321DBA dynamic bandwidth allocation 322DBB data bus buffer 323DBC design by contract 324DBL dynamic buffer limiting 325DBMS database management system 326DBS database server 327DC direct current 328DCC Direct Client-to-Client 329DCC direct cable connect 330DCD data carrier detect 331DCE data control equipment 332DCE distributed computing environment 333DCIM data center infrastructure management 334DCIM digital camera images 335DCL Digital Command Language 336DCOM distributed component object model 337DCOP Desktop COmmunication Protocol 338DCS data collection systems 339DCT discrete cosine transform 340DCU data cache unit 341DDC display data channel 342DDE dynamic data exchange 343DDK device driver kit 344DDL data description language 345DDR double data rate 346DDS direct digital sound 347DDWG Digital Display Working Group 348DE debugging extensions 349DE desktop environment 350DEA data encryption algorithm 351DEC Digital Equipment Corporation 352DEK data encryption key 353DEP data execution prevention 354DER distinguished encoding rules 355DES Data Encryption Standard 356DF don't fragment 357DFA deterministic finite automaton 358DFC data flow control 359DFS depth first search 360DFS distributed file system 361DFSAN Data Flow Sanitizer 362DFT diagnostic function test 363DFT discrete Fourier transform 364DGL data generation language 365DH Diffie-Hellman 366DHCP Dynamic Host Configuration Protocol 367DIFS distributed inter-frame space 368DIMM dual inline memory module 369DIRT design in real time 370DL diode logic 371DL discrete logarithm 372DL download 373DLE data link escape 374DLL dynamic link library 375DLP discrete logarithm problem 376DMA direct memory access 377DMI desktop management interface 378DMS document management system 379DMT discrete multitone modulation 380DMU data management layer 381DNARD Digital network appliance reference design 382DND drag and drop 383DNLC directory name lookup cache 384DNS Domain Name System 385DNSSEC DNS Security Extensions 386DOE distributed object environment 387DOF data over fibre 388DOM document object model 389DOS denial of service 390DOS disk operating system 391DP DisplayPort 392DPC deferred procedure call 393DPCM differential pulse code modulation 394DPD dead peer detection 395DPI deep packet inspection 396DPI dots per inch 397DPL descriptor privilege level 398DPS Display PostScript 399DPST display power savings technology 400DRAAS disaster recovery as a service 401DRAM dynamic random access memory 402DRBG deterministic random bit generator 403DRI direct rendering infrastructure 404DRM digital rights management 405DRRS display refresh rate switching 406DS debug store 407DSA digital signature algorithm 408DSAP destination service access point 409DSB double-sideband modulation 410DSDT differentiated system descriptor table 411DSL dataset and snapshot layer 412DSL digital subscriber line 413DSL domain specific language 414DSLAM digital subscriber line access multiplexer 415DSN delivery status notification 416DSO dynamic shared object 417DSP digital signal processor 418DSSS direct sequence spread spectrum 419DTD document type definition 420DTE data terminal equipment 421DTE dumb terminal emulator 422DTL diode-transistor logic 423DTLS datagram transport layer security 424DTS digital thermal sensor 425DUT device under test 426DVB digital video broadcasting 427DVCS distributed version control system 428DVD digital versatile disc 429DVFS dynamic voltage and frequency scaling 430DVI device independent 431DVI Digital Visual Interface 432DVR digital video recorder 433E-XER extended XML encoding rules 434EABI embedded-application binary interface 435EAI Email Address Internationalization 436EAI Enterprise Application Integration 437EAP Extensible Authentication Protocol 438EAPOL EAP over Lan 439EBCDIC Extended Binary Coded Decimal Interchange Code 440EBDA Extended BIOS Data Area 441EBNF extended backus-naur form 442EBR extended boot record 443EC elliptic curve 444ECC elliptic curve cryptography 445ECC error correction code 446ECDH elliptic curve Diffie-Hellman 447ECDL elliptic curve discrete logarithm 448ECDLP elliptic curve discrete logarithm problem 449ECDSA elliptic curve digital signature algorithm 450ECL emitter-coupled logic 451ECN explicit congestion notification 452ECP enhanced capability port 453ECS enhanced chip set 454ECS extended configuration space 455EDAC error detection and correction 456EDAT enhanced dynamic acceleration technology 457EdDSA Edwards curve digital signature algorithm 458EDGE explicit data graph execution 459EDID extended display identification data 460EDO extended data out 461EDS electronical data sheet 462EEE energy efficient ethernet 463EEPROM electrically erasable programmable read only memory 464EFI extensible firmware interface 465EFL emitter follower logic 466EFM eight to fourteen modulation 467EGA Enhanced Graphics Adapter 468EGP exterior gateway protocol 469EH extension header 470EIDE enhanced IDE 471EISA extended industry standard architecture 472EINJ error injection table 473ELF executable and linking format 474ELS entry level system 475EMI electro-magnetic interference 476EMP electro-magnetic pulse 477EMR electro-magnetic radiation 478EMACS Editor MACroS 479EOF end of file 480EOI end of interrupt 481EOIS end of interactive support 482EOL end of life 483EOL end of line 484EOT end of transmission 485EPIC explicitly parallel instruction computing 486EPP enhanced parallel port 487EPRML extended partial response, maximum likelihood 488EPROM erasable programmable read only memory 489ERD emergency recovery disk 490ERD entity relationship diagram 491ERE extended regular expression 492ERST error record serialization table 493ESAN Efficiency Sanitizer 494ESB enterprise service bus 495ESDI enhanced small disk interface 496ESDRAM enhanced synchronous dynamic random access memory 497ESI enclosure services interface 498ESS electronic switching system 499ESS extended service set 500ESSID extended service set identifier 501EST enhanced speedstep 502ETL extract, transform, load 503EU execution unit 504EULA end user license agreement 505FAT file allocation table 506FBRAM frame buffer random access memory 507FCIF full common intermediate format 508FCL fiber channel loop 509FCS frame check sequence 510FDC floppy disk controller 511FDD floppy disk drive 512FDDI fiber distributed data interface 513FDE full disk encryption 514FDT flattened device tree 515FEA finite element analysis 516FEC forward error correction 517FET field-effect transistor 518FF finite field 519FF form feed 520FFDH finite-field Diffie-Hellman 521FFH functional fixed hardware 522FFI foreign function interface 523FFM focus follows mouse 524FFS Fast File System 525FFS find first set 526FFT fast Fourier transform 527FG floating gate 528FHSS frequency hop spread spectrum 529FID frequency identifier 530FIFO first in, first out 531FILO first in, last out 532FIPS Federal Information Processing Standards 533FIR fast infrared 534FLOPS floating [point] operations per second 535FLOSS free/libre/open source software 536FM frequency modulation 537FMR false match rate 538FOSS free/open source software 539FPGA field programmable gate array 540FPM fast page mode 541FPR floating point register 542FPU floating point unit 543FQDN fully qualified domain name 544FRR false rejection rate 545FRU field replaceable unit 546FS file system 547FSB front side bus 548FSCK file system check 549FSF Free Software Foundation 550FSK frequency shift keying 551FSM finite-state machine 552FTA fault tree analysis 553FTL flash translation layer 554FTP File Transfer Protocol 555FTPS File Transfer Protocol Secure 556FUS fast user switching 557FWH firmware hub 558FWS folding white space 559GAL generic array logic 560GAS generic address structure 561GC garbage collector 562GCM Galois counter mode 563GCR group-coded recording 564GDI Graphics Device Interface 565GDT global descriptor table 566GEM graphics environment manager 567GEM graphics execution manager 568GENA general event notification architecture 569GHC Glasgow Haskell compiler 570GHES generic hardware error source 571GIC generic interrupt controller 572GID group identifier 573GIF graphics interchange format 574GMCH graphics and memory controller hub 575GNU GNU's Not Unix 576GOP graphics output protocol 577GOT global offset table 578GPE general purpose event 579GPF general protection fault 580GPG GNU Privacy Guard 581GPL [GNU] General Public License 582GPR general purpose register 583GPS generalized processor sharing 584GPT GUID partition table 585GPU graphics processing unit 586GR golden ratio 587GRE generic routing encapsulation 588GSI global system interrupt 589GUI graphical user interface 590GUID globally unique identifier 591GVFS git virtual file system 592HA high availability 593HAL hardware abstraction layer 594HAT hashed array tree 595HATEOAS hypermedia as the engine of application state 596HBA host bus adapter 597HCF halt and catch fire 598HCI host controller interface 599HCI human-computer interaction 600HCL hardware compatibility list 601HDCP High-bandwidth Digital Content Protection 602HDD hard disk drive 603HDL hardware description language 604HDMI High-Definition Multimedia Interface 605HDTV high-definition television 606HECI host embedded controller interface 607HEST hardware error source table 608HF high frequency 609HFM highest frequency mode 610HID human interface device 611HKP HTTP Keyserver Protocol 612HLL high-level language 613HMA high memory area 614HMI human-machine interface 615HOOD hierarchical object oriented design 616HP Hewlett-Packard 617HPC high performance computing 618HPET high precision event timer 619HSM hardware security module 620HSM hierarchical storage management 621HT hyper-threading 622HTC hardware thermal control 623HTCC high temperature co-fired ceramic 624HTML HyperText Markup Language 625HTT hyper-threading technology 626HTTP Hypertext Transfer Protocol 627HTTPS Hypertext Transfer Protocol Secure 628HVM hardware virtual machine 629HVDS High-Voltage Differential Signaling 630HWASAN Hardware-assisted Address Sanitizer 631HZ Hertz 632I2O intelligent input/output 633IA information assurance 634IAAS infrastructure as a service 635IANA Internet Assigned Numbers Authority 636IBC iterated block cipher 637IBM International Business Machines 638IBS instruction based sampling 639IBSS independent basic service set 640IC integrated circuit 641ICA independent computer architecture 642ICB Internet Citizen's Band 643ICE in-circuit emulator 644ICE internal compiler error 645ICH I/O controller hub 646ICMP Internet Control Message Protocol 647ICT information and communications technology 648ICW initialization command word 649IDA Intel dynamic acceleration 650IDCMP Intuition direct communication message port 651IDE integrated development environment 652IDE integrated drive electronics 653IDPS intrusion detection [and] prevention system 654IDRP inter-domain routing protocol 655IDS intrusion detection system 656IDT interrupt descriptor table 657IE Internet Explorer 658IEC International Electrotechnical Commission 659IEEE Institute of Electrical and Electronics Engineers 660IESG Internet Engineering Steering Group 661IETF Internet Engineering Task Force 662IF intermediate frequency 663IFCM isochronous flow control mode 664IFF Interchange File Format 665IFS internal field separator 666IGD Internet gateway device 667IGMP Internet Group Management Protocol 668IGP interior gateway protocol 669IHV independent hardware vendor 670IKE Internet key exchange 671ILM internal loopback mode 672ILOM integrated lights-out management 673ILP instruction level parallelism 674IM instant messaging 675IMAP Internet Message Access Protocol 676IMC integrated memory controller 677IMCR interrupt mode configuration register 678IMR interrupt mask register 679IMS information management system 680IMSI international mobile subscriber identity 681INCITS InterNational Committee for Information Technology Standards 682IO input/output 683IOCTL input/output control 684IOM input/output managers 685IOMMU input/output memory management unit 686IOT Internet of Things 687IP Internet Protocol 688IP intellectual property 689IPC instructions per cycle 690IPC interprocess communication 691IPCF interprocess communication facility 692IPE integrated programming environment 693IPI intelligent peripheral interface 694IPI interprocessor interrupt 695IPL Initial Program Load 696IPL Interrupt Priority Level 697IPMB Intelligent Platform Management Bus 698IPMI Intelligent Platform Management Interface 699IPNG Internet Protocol, Next Generation 700IPS in-plane switching 701IPS intrusion prevention system 702IPSEC Internet Protocol Security 703IRC Internet Relay Chat 704IRDA infrared data association 705IRQ interrupt request 706IRQL interrupt request level 707IRR interrupt request register 708IRTF Internet Research Task Force 709IS information system 710ISA industry standard architecture 711ISA instruction set architecture 712ISDN integrated services digital network 713ISI inter-symbol interference 714ISM industrial, scientific, [and] medical 715ISN initial serial number 716ISO International Standards Organization 717ISOC Internet Society 718ISP Internet service provider 719ISR in-service register 720ISR interrupt service routine 721IST interrupt stack table 722ISV independent software vendor 723IT information technology 724ITB Intel Turbo Boost 725ITIL information technology infrastructure library 726ITP in-target probe 727ITSM IT service management 728IV initialization vector 729IVT interrupt vector table 730JBOD just a bunch of disks 731JCL Job Control Language 732JFET junction [gate] field-effect transistor 733JIT just in time 734JPEG Joint Photographic Experts Group 735JRE Java Runtime Environment 736JSON JavaScript Object Notation 737JTAG joint test action group 738KASLR kernel address space layout randomization 739KB keyboard 740KB kilobyte 741KBD keyboard 742KBD kilobaud 743KCS keyboard controller style 744KLOC thousand lines of code 745KMS kernel-mode setting 746KPI kernel programming interface 747KVA kernel virtual address 748KVM kernel virtual machine 749KVM kernel virtual memory 750KVM keyboard, video, [and] mouse 751LAMP Linux Apache MySQL {Perl,PHP,Python} 752LAN local area network 753LAPIC local advanced programmable interrupt controller 754LAR load access rights 755LBA logical block addressing 756LBNF labeled backus-naur form 757LBS location-based service 758LCD liquid crystal display 759LCP link control protocol 760LDA local delivery agent 761LDAP Lightweight Directory Access Protocol 762LDR light-dependent resistor 763LDT local descriptor table 764LE logical extent 765LED light emitting diode 766LELL low energy link layer 767LER label edge router 768LF line feed 769LF low frequency 770LFM lowest frequency mode 771LFN long file names 772LFO low-frequency oscillation 773LFS log-structured file system 774LFU least frequently used 775LHP loop heat pipe 776LIFO last in, first out 777LILO LInux LOader 778LILO last in, last out 779LINT local interrupt 780LIR local Internet registry 781LISP LISt Processor 782LISP Locator/ID Separation Protocol 783LKM {Linux,loadable} kernel module 784LKML Linux kernel mailing list 785LL load linked 786LL/SC load linked/store conditional 787LLC logical link control 788LLD low-level design 789LLDD low-level design document 790LLDP link layer discovery protocol 791LLF low level format 792LLMNR link-local multicast name resolution 793LLVM Low Level Virtual Machine 794LM long mode 795LMM link management mode 796LMP link management protocol 797LNO loop nest optimization 798LOC lines of code 799LOM lights-out management 800LPE Linux performance events 801LPC low pin count 802LPS local positioning system 803LRC longitudinal redundancy check 804LRM left-to-right mark 805LRO left-to-right override 806LRU least recently used 807LSAN Leak Sanitizer 808LSB Linux standards base 809LSB least significant {bit,byte} 810LSI large scale integration 811LSL load segment limit 812LSM log structured merge 813LSN Large Scale NAT 814LSN log sequence number 815LSR label switch router 816LTCC low temperature co-fired ceramic 817LTO linear tape-open 818LTO link time optimization 819LTR left to right 820LTR load task register 821LTR letter(-sized paper) 822LTS long term support 823LUA Lua Uppercase Accident 824LUN logical unit number 825LV logical volume 826LVM logical volume management 827LVT local vector table 828LVDS Low-Voltage Differential Signaling 829LWP light-weight process 830LZW Lempel Ziv Welch 831MAC mandatory access control 832MAC {media,medium} access control 833MAC message authentication {check,code} 834MADT multiple APIC descriptor table 835MB megabyte 836MBA multi-boot agent 837MBR master boot record 838MBS megabits per second 839MC memory controller 840MCA machine check architecture 841MCA MicroChannel architecture 842MCC multiversion concurrency control 843MCE machine check exception 844MCGA Multi-Color Graphics Array 845MCH memory controller hub 846MCM multi-chip module 847MCQ memory controlled queue 848MD machine-dependent 849MD-SAL model-driven service abstraction layer 850MDA mail delivery agent 851MDA Monochrome Display Adapter 852MDC Management Data Clock 853MDI Medium Dependent Interface 854MDI-X Medium Dependent Interface Crossover 855MDIO Management Data Input/Output 856MDMX MIPS Digital Media eXtension 857MDRAM multibank dynamic random access memory 858MESI modified, exclusive, shared, invalid 859MFC merge from current 860MFC Microsoft Foundation Classes 861MFM modified frequency modulation 862MFU most frequently used 863MI machine-independent 864MI machine interface 865MIB management information base 866MIC message integrity {check,code} 867MID mobile Internet device 868MIDI musical instrument digital interface 869MIF management information format 870MII media independent interface 871MIM man in the middle 872MIMD multiple instruction, multiple data 873MIME Multipurpose Internet Mail Extensions 874MIMO multiple input multiple output 875MIPS million instructions per second 876MIPS Microprocessor without Interlocked Pipeline Stages 877MISD multiple instruction, single data 878MIT Massachusetts Institute of Technology 879MITM man in the middle 880ML machine language 881ML machine learning 882ML mailing list 883ML markup language 884ML maximum likelihood 885MLC multi-level cell 886MLD multicast listener discovery 887MLHP micro loop heat pipe 888MMF multi-mode fiber 889MMIC monolithic microwave integrated circuit 890MMIO memory mapped input/output 891MMORPG massive multiplayer online role playing game 892MMU memory management unit 893MMX matrix math extension 894MMX multimedia extension 895MMX multiple math extension 896MO magneto-optical 897MOESI modified, owned, exclusive, shared, invalid 898MOF maximum operating frequency 899MOSFET metal-oxide-semiconductor field-effect transistor 900MOSI modified, owned, shared, invalid 901MP multi-platform 902MP multiplayer 903MP {multiprocessing,multiprocessor} 904MPEG moving picture experts group 905MPI message passing interface 906MPLS Multiprotocol Label Switching 907MPP massively parallel processor 908MPS memory pool system 909MPS multiprocessor specification 910MQTT Message Queuing Telemetry Transport 911MR modem ready 912MRU most recently used 913MS Microsoft 914MSAN Memory Sanitizer 915MSB most significant {bit,byte} 916MSC message sequence chart 917MSE mean square error 918MSF minutes seconds frames 919MSI message signaled interrupt 920MSI modified, shared, invalid 921MSR {machine state,model-specific} register 922MSS maximum segment size 923MSTP Multiple Spanning Tree Protocol 924MT machine translation 925MTA mail transfer agent 926MTBF mean time between failures 927MTP media transfer protocol 928MTRR memory type range register 929MTTF mean time to failure 930MTU maximum transmission unit 931MUA mail user agent 932MUD multi-user domain 933MVCC multiversion concurrency control 934MWE module width encoding 935MX mail exchange 936NACK negative acknowledgement 937NAK negative acknowledgement 938NAN not a number 939NAPT Network Address Port Translation 940NAS network attached storage 941NAT network address translation 942NAV network allocation vector 943NC numerical control 944NCO numerically-controlled oscillator 945NCP Network Control Protocol 946NCQ native command queuing 947ND neighbor discovery 948NDFA nondeterministic finite automaton 949NE numeric error 950NEWS Network extensible Window System 951NFA nondeterministic finite automaton 952NFC near-field communication 953NFCI no functional change intended 954NFS network file system 955NFV network function virtualization 956NIA next instruction address 957NIC network information center 958NIC network interface card 959NIDS network intrusion detection system 960NIP network interface protocol 961NIPS network intrusion prevention system 962NIS network information service 963NIST National Institute of Standards and Technology 964NLS native language support 965NMI non-maskable interrupt 966NNTP Network News Transfer Protocol 967NOC network operations center 968NOP no operation 969NOS network operating system 970NP nondeterministic polynomial time 971NRND not recommended for new designs 972NRZ non-return to zero 973NSA nation-state adversary 974NSA no such agency 975NSA National Security Agency 976NTM non-deterministic Turing machine 977NTP Network Time Protocol 978NUMA non-uniform memory access 979NVRAM non-volatile random access memory 980NW not write-through 981NX no execute 982OAEP optimal asymmetric encryption padding 983OAM operations, administration, and {management,maintenance} 984OBO off by one 985OBOE off by one error 986OCL object constraint language 987OCR optical character recognition 988ODCM on-demand clock modulation 989ODT on-die termination 990OEM original equipment manufacturer 991OFB output feedback 992OFDM orthogonal frequency division multiplexing 993OFET organic field-effect transistor 994OLAP online analytical processing 995OLE object linking and embedding 996OLTP online transaction processing 997ONFI open nand flash interface 998OO OpenOffice 999OO object oriented 1000OOB out of band 1001OOE out of order execution 1002OOM out of memory 1003OOO OpenOffice.org 1004OOP object oriented programming 1005OOPS object oriented programming systems 1006OOSE object oriented software engineering 1007OPM operations per minute 1008OPS operations per second 1009OQL Object Query Language 1010ORB object request broker 1011ORM object-relational mapping 1012OS operating system 1013OSD open source definition 1014OSF open software foundation 1015OSI Open Source Initiative 1016OSI open systems interconnection 1017OSPF open shortest path first 1018OSPM OS power management 1019OSS open sound system 1020OSS open source software 1021OSVW operating system visible workarounds 1022OTP one time password 1023OTP open telecom platform 1024OU organizational unit 1025OUI organizationally unique identifier 1026OWL Web Ontology Language 1027P2P PCI to PCI 1028P2P peer to peer 1029PA phase accumulator 1030PA physical address 1031PAAS platform as a service 1032PAC phase-amplitude converter 1033PAE physical address extension 1034PAL phase alternating line 1035PAL programmable array logic 1036PAM pluggable authentication modules 1037PAM pulse amplitude modulation 1038PAP password authentication protocol 1039PAT page attribute table 1040PAT port address translation 1041PATA parallel ATA 1042PAX portable archive exchange 1043PBE pending break encoding 1044PBE programming by example 1045PC personal computer 1046PC program counter 1047PCB printed circuit board 1048PCB process control block 1049PCB Protocol Control Block 1050PCC Portable C Compiler 1051PCD page-level cache disable 1052PCE path computation element 1053PCE performance-monitor counter enable 1054PCEP Path Computation Element Protocol 1055PCH platform controller hub 1056PCI peripheral component interconnect 1057PCM phase change memory 1058PCM pulse code modulation 1059PCMCIA Personal Computer Memory Card International Association 1060PCP Port Control Protocol 1061PD public domain 1062PDA personal digital assistant 1063PDA pushdown automaton 1064PDAG propositional directed acyclic graph 1065PDB power distribution board 1066PDF portable document format 1067PDM pulse-duration modulation 1068PDN pull-down network 1069PDP page {descriptor,directory} page 1070PDS product data sheet 1071PDU protocol data unit 1072PE protection enable 1073PEAP Protected EAP 1074PECI platform environment control interface 1075PEP protocol extension protocol 1076PER packed encoding rules 1077PFS perfect forward secrecy 1078PGAS partitioned global address space 1079PGE page global enable 1080PGP Pretty Good Privacy 1081PHB PCI host bridge 1082PHP PHP: Hypertext Preprocessor 1083PIC performance instrumentation counters 1084PIC position independent code 1085PIC programmable interrupt controller 1086PICNIC problem in chair, not in computer 1087PID process id 1088PIE position independent executable 1089PIL Priority Interrupt Level 1090PIM personal information manager 1091PIM platform-independent model 1092PIO programmed input/output 1093PIPT physically indexed, physically tagged 1094PIQ prefetch input queue 1095PIT programmable interrupt timer 1096PIV personal identity verification 1097PIX Private Internet eXchange 1098PKCS public-key cryptography standards 1099PKI public key infrastructure 1100PLC programmable logic controller 1101PLD programmable logic device 1102PLL phase locked loop 1103PLRU pseudo LRU 1104PLTM package level thermal management 1105PM power management 1106PM {phase,pulse} modulation 1107PMC performance monitoring counters 1108PME power management event 1109PMEG page map entry group 1110PMI performance monitoring infrastructure 1111PMI platform management interrupt 1112PMIC power management integrated circut 1113PMIO port-mapped input/output 1114PMT photo-multiplier tube 1115PMU performance monitoring units 1116PMU power management unit 1117PNG portable network graphics 1118PNP plug and play 1119POE power over ethernet 1120POF probability of failure 1121POP Post Office Protocol 1122POP power on password 1123POSIX Portable Operating System Interface [for Unix] 1124POST power on self test 1125POTS plain old telephone system 1126POWER Performance Optimization With Enhanced RISC 1127POWERPC Performance Optimization With Enhanced RISC - Performance Computing 1128PP pair programming 1129PPB PCI [to] PCI bridge 1130PPC PowerPC 1131PPC Power Performance Computing 1132PPI pixels per inch 1133PPM pages per minute 1134PPP Point-to-Point Protocol 1135PPPOA Point-to-Point Protocol over ATM 1136PPPOE Point-to-Point Protocol over Ethernet 1137PPU physics processing unit 1138PRAM Parameter RAM 1139PRBS pseudorandom bit sequence 1140PRG pseudorandom generator 1141PRF pseudorandom function [family] 1142PRML partial response, maximum likelihood 1143PRN pseudorandom {noise,number} 1144PRNG pseudorandom number generator 1145PROM programmable read only memory 1146PRP pseudorandom permutation 1147PRU Programmable Realtime Unit 1148PS PostScript 1149PSD power spectral density 1150PSE page size extensions 1151PSK phase shift keying 1152PSK pre-shared key 1153PSTN public switched telephone network 1154PSW program status word 1155PTE page table entry 1156PTLA pseudo top level aggregator 1157PTP page table page 1158PTV perceived target value 1159PU processing unit 1160PUC personal unblocking code 1161PUN physical unit number 1162PV physical volume 1163PVG physical volume group 1164PVI protected-mode virtual interrupt 1165PVST Per-VLAN Spanning Tree 1166PWM pulse width modulation 1167PXE preboot execution environment 1168QA quality assurance 1169QAM quadrature amplitude modulation 1170QAM quality assurance management 1171QBE query by example 1172QC quality control 1173QDI quasi delay insensitive 1174QCIF quarter common intermediate format 1175QOS quality of service 1176QVL qualified vendor list 1177R/O read only 1178R/W read/write 1179RA receiver address 1180RA remote assistance 1181RA resource affinity 1182RA router advertisement 1183RAD rapid application development 1184RAID redundant array of {independent,inexpensive} disks 1185RAM random access memory 1186RAS reliability, availability and serviceability 1187RAS remote access service 1188RAS restartable atomic sequence 1189RAS row address strobe 1190RBF radial basis function 1191RBNF routing backus-naur form 1192RBT red-black tree 1193RC release candidate 1194RC remote control 1195RC run commands 1196RCS Revision Control System 1197RCS revision control system 1198RCU read, copy, update 1199RDB Rigid Disk Block 1200RDBMS relational database management system 1201RDF Resource Description Framework 1202RDM relational data model 1203RDMA remote direct memory access 1204RDRAM Rambus DRAM 1205RE regular expression 1206REST representational state transfer 1207RF radio frequency 1208RFI radio frequency interference 1209RFO request for ownership 1210RGB red green blue 1211RGBA red green blue alpha 1212RGMII reduced gigabit media independent interface 1213RH read hit 1214RHEL Red Hat Enterprise Linux 1215RHL Red Hat Linux 1216RIB routing information base 1217RIFF Resource Interchange File Format 1218RIP Raster Image Processor 1219RIP Routing Information Protocol 1220RIR regional Internet registry 1221RISC reduced instruction set {computer,computing} 1222RKM ROM Kernel Manual 1223RLE run length encoding 1224RLL run length limited 1225RLO right-to-left override 1226RM read miss 1227RMCP Remote Management Control Protocol 1228RMI remote method invocation 1229RMO Relaxed Memory Ordering 1230RMPM rapid memory power management 1231RMS root mean square 1232RMW read, modify, write 1233RNG random number generator 1234ROM read only memory 1235RPC remote procedure call 1236RPKI resource PKI 1237RPL requested privilege level 1238RPM revolutions per minute 1239RPN reverse Polish notation 1240RPVST Rapid Per-VLAN Spanning Tree 1241RR random replacement 1242RR round robin 1243RS relay station 1244RSA Rivest, Shamir, [and] Adleman 1245RSIP Realm Specific IP 1246RSN Robust Secure Network 1247RSS really simple syndication 1248RSS residual sum of squares 1249RSTP Rapid Spanning Tree Protocol 1250RT real time 1251RTC real time clock 1252RTC real time computing 1253RTF rich text format 1254RTL register transfer language 1255RTL resistor-transistor logic 1256RTL right to left 1257RTOS real time operating system 1258RTS request to send 1259RTT round trip time 1260RUP rational unified process 1261RW Rabin-Williams 1262RWM read-write memory 1263RX {receive,receiver} 1264S/PDIF Sony/Philips Digital Interface Format 1265SA security advisory 1266SA security association 1267SA source address 1268SA structured analysis 1269SAAS software as a service 1270SACD super audio compact disc 1271SAD security association database 1272SAL {service,system} abstraction layer 1273SAM serial access memory 1274SAM sum addressed memory 1275SAML security assertion markup language 1276SAN storage area network 1277SAP service access point 1278SAPIC streamlined advanced programmable interrupt controller 1279SASD structured analysis, structured design 1280SASI Shugart Associates System Interface 1281SASL simple authentication [and] security layer 1282SATA serial advanced technology attachment 1283SAX simple API for XML 1284SB sound blaster 1285SBU standard build unit 1286SC store conditional 1287SCA source code analyzer 1288SCADA supervisory control and data acquisition 1289SCC single chip cloud 1290SCC source code control 1291SCCS Source Code Control System 1292SCI scalable coherent interface 1293SCI system control interrupt 1294SCM software configuration management 1295SCM source code management 1296SCM storage-class memory 1297SCO synchronous connection orientated 1298SCP secure copy 1299SCSI Small Computer System Interface 1300SCTP Stream Control Transmission Protocol 1301SDEI software delegated exception interface 1302SDI symbol deinterleave 1303SDK software development kit 1304SDL Simple Declarative Language 1305SDL Simple Direct-media Layer 1306SDLC {software,system,systems} development life cycle 1307SDN software defined networking 1308SDP Session Description Protocol 1309SDRAM synchronous dynamic random access memory 1310SDS software defined storage 1311SDT syntax-directed translation 1312SEA synchronous external abort 1313SEGV segmentation violation 1314SEO search engine optimization 1315SES SCSI enclosure services 1316SFC sequential function chart 1317SFI simple firmware interface 1318SFI software fault isolation 1319SFTP SSH File Transfer Protocol 1320SFTP Serial File Transfer Protocol 1321SFTP Simple File Transfer Protocol 1322SGMII serial gigabit media independent interface 1323SGRAM synchronous graphics random access memory 1324SHA secure hash algorithm 1325SIDH supersingular isogeny Diffie-Hellman 1326SIEM security information and event management 1327SIF source input format 1328SIFS short inter-frame space 1329SIM subscriber identity module 1330SIMD single instruction, multiple data 1331SIMM single inline memory module 1332SIP Session Initiation Protocol 1333SIR signal-to-interference ratio 1334SIR slow infrared 1335SISD single instruction, single data 1336SLAAC stateless address auto-configuration 1337SLC single-level cell 1338SLDRAM synchronous-link dynamic random access memory 1339SLED single large expensive disk 1340SLI scalable link interface 1341SLI scan-line interleave 1342SLIC system license internal code 1343SLOC source lines of code 1344SLRU segmented LRU 1345SMA smart memory access 1346SMAF system management action field 1347SMAP Simple Mail Access Protocol 1348SMAP supervisor mode access prevention 1349SMART self-monitoring analysis and reporting technology 1350SMB Server Message Block 1351SMB system management bus 1352SMBIOS System Management BIOS 1353SMC system management controller 1354SMD storage module device 1355SMEP supervisor mode execution protection 1356SMF single mode fiber 1357SMI structure of management information 1358SMI system management interrupt 1359SMM system management mode 1360SMP symmetric multiprocessing 1361SMT simultaneous multithreading 1362SMTP Simple Mail Transfer Protocol 1363SMU system management unit 1364SNA systems network architecture 1365SNAP Sub-Network Access Protocol 1366SNIA Storage Networking Industry Association 1367SNMP Simple Network Management Protocol 1368SNR signal-to-noise ratio 1369SOA service oriented architecture 1370SOAP Simple Object Access Protocol 1371SOC system on chip 1372SOF start of frame 1373SOH start of header 1374SOHO small office/home office 1375SOL serial over LAN 1376SOM system on module 1377SP service pack 1378SP stack pointer 1379SPA storage pool allocator 1380SPARC scalable processor architecture 1381SPARQL SPARQL Protocol and RDF Query Language 1382SPD security policy database 1383SPD serial presence detect 1384SPDIF Sony/Philips digital interface format 1385SPI serial peripheral interface 1386SPI stateful packet inspection 1387SPL system interrupt priority level 1388SPL spinlock 1389SPMD single process, multiple data 1390SPR special purpose register 1391SPT sectors per track 1392SQA software quality assurance 1393SQCIF sub quarter common intermediate format 1394SQL Structured Query Language 1395SRAM static random access memory 1396SRC sample rate conversion 1397SRP SCSI RDMA protocol 1398SS self-snoop 1399SS stack segment 1400SSA static single assignment 1401SSAP source service access point 1402SSB single-sideband modulation 1403SSD solid state drive 1404SSE streaming SIMD extensions 1405SSFDC solid state floppy disc card 1406SSH secure shell 1407SSI server side includes 1408SSID service set identifier 1409SSL secure sockets layer 1410SSP stack smashing protection 1411STC software thermal control 1412STD state transition diagram 1413STOMP Streaming Text Oriented Messaging Protocol 1414STP Spanning Tree Protocol 1415STP shielded twisted pair 1416SUN Stanford University Network 1417SUS Single Unix Specification 1418SUT system under test 1419SVG scalable vector graphics 1420SVGA Super Video Graphics Array 1421SVI {switch,switched} virtual interface 1422SVM secure virtual machine 1423SVM support vector machine 1424SVR System V Release 1425SVS Separate Virtual Space 1426SWF Shockwave Flash 1427SWIG simplified wrapper [and] interface generator 1428SYR symbol timing recovery 1429TA test assertion 1430TA transmitter address 1431TAI international atomic time 1432TAO track at once 1433TAOCP The Art of Computer Programming 1434TAP Test Anything Protocol 1435TAS test and set 1436TB terabyte 1437TBNF transitional backus-naur form 1438TCB trace capture buffer 1439TCB trusted computing base 1440TCC thermal control circuit 1441TCL tool command language 1442TCP Transmission Control Protocol 1443TCQ tagged command queueing 1444TDC time [to] digital converter 1445TDD test-driven development 1446TDD time division duplex 1447TDM time division multiplexing 1448TDMA time division multiple access 1449TDOA time difference of arrival 1450TDP thermal design {point,power} 1451TECO Text Editor and Corrector 1452TFT thin film transistor 1453TFTP Trivial File Transfer Protocol 1454TIAS try it and see 1455TIFF tagged image file format 1456TITS try it to see 1457TK temporal key 1458TKIP Temporal Key Integrity Protocol 1459TLA top level aggregator 1460TLB translation lookaside buffer 1461TLD top level domain 1462TLI transport layer interface 1463TLS thread local storage 1464TLS transport layer security 1465TM Turing machine 1466TM thermal monitor 1467TMDS transition minimized differential signaling 1468TMO timeout 1469TOD time of day 1470TOS terms of service 1471TOS trusted operating system 1472TOS type of service 1473TP transaction processing 1474TPI tracks per inch 1475TPM transactions per minute 1476TPM trusted platform module 1477TPR task priority register 1478TPS transactions per second 1479TPS transmission parameters signaling 1480TR task register 1481TR token ring 1482TRL timing recovery loop 1483TRNG true random number generator 1484TS terminal services 1485TS time series 1486TS time stamp 1487TS transport stream 1488TSAN Thread Sanitizer 1489TSC time stamp counter 1490TSD time stamp disable 1491TSDB time series database 1492TSL test, set, lock 1493TSO time sharing option 1494TSO Total Store Ordering 1495TSP Time-Stamp Protocol 1496TSP Tunnel Setup Protocol 1497TSP time synchronization protocol 1498TSP traveling salesman problem 1499TSS task state segment 1500TTL time to live 1501TTL transistor-transistor logic 1502TTM translation table maps 1503TTY teletype 1504TUI {terminal,text-based,textual} user interface 1505TX {transmit out,transmitter} 1506TXG transaction group 1507TZ time zone 1508UAC user {access,account} control 1509UAF use-after-free 1510UART universal asynchronous receiver/transmitter 1511UAT user acceptance testing 1512UB undefined behavior 1513UBSAN Undefined Behavior Sanitizer 1514UC uncacheable 1515UCS uniform-cost search 1516UDMA ultra DMA 1517UDO ultra density optical 1518UDP User Datagram Protocol 1519UEFI unified extensible firmware interface 1520UFS Unix File System 1521UGA universal graphics adapter 1522UI unit interval 1523UI user interface 1524UICC universal integrated circuit card 1525UID unique identifier 1526UID user identifier 1527UL upload 1528UMA uniform memory access 1529UMA upper memory area 1530UMB upper memory block 1531UML unified modeling language 1532UMPC ultra-mobile PC 1533UPNP universal plug and play 1534UPS uninterruptible power supply 1535URI uniform resource identifier 1536URL uniform resource locator 1537URN uniform resource name 1538USART universal synchronous/asynchronous receiver/transmitter 1539USB universal serial bus 1540USWC uncacheable speculative write combining 1541UT unit test 1542UTC coordinated universal time 1543UTP unshielded twisted pair 1544UUCP Unix-to-Unix Copy Protocol 1545UUID universally unique identifier 1546UUOC useless use of cat 1547UUT unit under test 1548UX user experience 1549VA vertical alignment 1550VA virtual address 1551VA volt-ampere 1552VAX virtual address extension 1553VB Visual Basic 1554VCA variable-gain amplifier 1555VCC common collector voltage 1556VCF voltage-controlled filter 1557VCM virtual channel memory 1558VCO voltage-controlled oscillator 1559VCS version control system 1560VESA Video Electronics Standards Association 1561VFO variable-frequency oscillator 1562VFS virtual file system 1563VG volume group 1564VGA Video Graphics Array 1565VHDCI very high density cable interconnect 1566VID {VLAN,voltage level} identifier 1567VIM Vi IMproved 1568VIPT virtually indexed, physically tagged 1569VIVT virtually indexed, virtually tagged 1570VLAN virtual local area network 1571VLIW very long instruction word 1572VLSI very large scale integration 1573VLSM variable length subnet mask 1574VM virtual {machine,memory} 1575VME virtual mode extension 1576VMX vector multimedia extensions 1577VMX virtual machine extensions 1578VOD video on demand 1579VPN virtual private network 1580VR virtual reality 1581VRAM video random access memory 1582VRF virtual routing and forwarding 1583VRM voltage regulator module 1584VRRP Virtual Router Redundancy Protocol 1585VSTP VLAN Spanning Tree Protocol 1586VTP VLAN Trunking Protocol 1587W watt 1588W3C World Wide Web Consortium 1589WAFL write anywhere file layout 1590WAMP Web Application Messaging Protocol 1591WAN wide area network 1592WAP Wireless Application Protocol 1593WAP wireless access point 1594WDM Windows Driver Model 1595WDDM Windows Display Driver Model 1596WDT watchdog timer 1597WEP Wired Equivalent Privacy 1598WFI wait for interrupt 1599WFQ weighted fair queuing 1600WH write hit 1601WIFI wireless fidelity 1602WLAN wireless local area network 1603WM write miss 1604WMI Windows Management Instrumentation 1605WOL Wake-on-LAN 1606WOM Wake-on-Modem 1607WOR Wake-on-Ring 1608WORM write once read many 1609WP WordPerfect 1610WP word processor 1611WP write protect 1612WPA Wi-Fi Protected Access 1613WPA2 Wi-Fi Protected Access II 1614WPS Wi-Fi Protected Setup 1615WRAM window random access memory 1616WS web services 1617WTC write through caching 1618WWAN wireless wide area network 1619WWW world wide web 1620WYSIAYG what you see is all you get 1621WYSIWYG what you see is what you get 1622XBAR crossbar 1623XDMCP X Display Manager control protocol 1624XER XML encoding rules 1625XGA Extended Graphics Array 1626XHR XMLHttpRequest 1627XIP execute in place 1628XML Extensible Markup Language 1629XNA XNA's not acronymed 1630XNS Xerox network systems 1631XOR exclusive or 1632XP extreme programming 1633XSI X/Open System Interface 1634XSL extensible stylesheet language 1635XSS cross site scripting 1636XT extended technology 1637XTI X/Open transport interface 1638XUL XML user interface language 1639YACC yet another compiler compiler 1640YAML YAML ain't markup language 1641YANG yet another next generation 1642YAWPFAPR you are welcome; please file a problem report 1643YP Yellow Pages 1644YTD year to date 1645ZAP ZFS attribute processor 1646ZBR zone bit recording 1647ZFOD zero-filled on demand 1648ZFS zettabyte file system 1649ZIF zero insertion force 1650ZIFS zero insertion force socket 1651ZIL ZFS intent log 1652ZMA zone multicast address 1653ZPL ZFS Posix layer 1654ZVOL ZFS Volume 1655