acronyms.comp revision 1.242
1$NetBSD: acronyms.comp,v 1.242 2019/04/05 15:07:42 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 788LLDP link layer discovery protocol 789LLF low level format 790LLMNR link-local multicast name resolution 791LLVM Low Level Virtual Machine 792LM long mode 793LMM link management mode 794LMP link management protocol 795LNO loop nest optimization 796LOC lines of code 797LOM lights-out management 798LPE Linux performance events 799LPC low pin count 800LPS local positioning system 801LRC longitudinal redundancy check 802LRM left-to-right mark 803LRO left-to-right override 804LRU least recently used 805LSAN Leak Sanitizer 806LSB Linux standards base 807LSB least significant {bit,byte} 808LSI large scale integration 809LSL load segment limit 810LSM log structured merge 811LSN Large Scale NAT 812LSN log sequence number 813LSR label switch router 814LTCC low temperature co-fired ceramic 815LTO linear tape-open 816LTO link time optimization 817LTR left to right 818LTR load task register 819LTR letter(-sized paper) 820LTS long term support 821LUA Lua Uppercase Accident 822LUN logical unit number 823LV logical volume 824LVM logical volume management 825LVT local vector table 826LVDS Low-Voltage Differential Signaling 827LWP light-weight process 828LZW Lempel Ziv Welch 829MAC mandatory access control 830MAC {media,medium} access control 831MAC message authentication {check,code} 832MADT multiple APIC descriptor table 833MB megabyte 834MBA multi-boot agent 835MBR master boot record 836MBS megabits per second 837MC memory controller 838MCA machine check architecture 839MCA MicroChannel architecture 840MCC multiversion concurrency control 841MCE machine check exception 842MCGA Multi-Color Graphics Array 843MCH memory controller hub 844MCM multi-chip module 845MCQ memory controlled queue 846MD machine-dependent 847MD-SAL model-driven service abstraction layer 848MDA mail delivery agent 849MDA Monochrome Display Adapter 850MDC Management Data Clock 851MDI Medium Dependent Interface 852MDI-X Medium Dependent Interface Crossover 853MDIO Management Data Input/Output 854MDMX MIPS Digital Media eXtension 855MDRAM multibank dynamic random access memory 856MESI modified, exclusive, shared, invalid 857MFC merge from current 858MFC Microsoft Foundation Classes 859MFM modified frequency modulation 860MFU most frequently used 861MI machine-independent 862MI machine interface 863MIB management information base 864MIC message integrity {check,code} 865MID mobile Internet device 866MIDI musical instrument digital interface 867MIF management information format 868MII media independent interface 869MIM man in the middle 870MIMD multiple instruction, multiple data 871MIME Multipurpose Internet Mail Extensions 872MIMO multiple input multiple output 873MIPS million instructions per second 874MIPS Microprocessor without Interlocked Pipeline Stages 875MISD multiple instruction, single data 876MIT Massachusetts Institute of Technology 877MITM man in the middle 878ML machine language 879ML machine learning 880ML mailing list 881ML markup language 882ML maximum likelihood 883MLC multi-level cell 884MLD multicast listener discovery 885MLHP micro loop heat pipe 886MMF multi-mode fiber 887MMIC monolithic microwave integrated circuit 888MMIO memory mapped input/output 889MMORPG massive multiplayer online role playing game 890MMU memory management unit 891MMX matrix math extension 892MMX multimedia extension 893MMX multiple math extension 894MO magneto-optical 895MOESI modified, owned, exclusive, shared, invalid 896MOF maximum operating frequency 897MOSFET metal-oxide-semiconductor field-effect transistor 898MOSI modified, owned, shared, invalid 899MP multi-platform 900MP multiplayer 901MP {multiprocessing,multiprocessor} 902MPEG moving picture experts group 903MPI message passing interface 904MPLS Multiprotocol Label Switching 905MPP massively parallel processor 906MPS memory pool system 907MPS multiprocessor specification 908MQTT Message Queuing Telemetry Transport 909MR modem ready 910MRU most recently used 911MS Microsoft 912MSAN Memory Sanitizer 913MSB most significant {bit,byte} 914MSC message sequence chart 915MSE mean square error 916MSF minutes seconds frames 917MSI message signaled interrupt 918MSI modified, shared, invalid 919MSR {machine state,model-specific} register 920MSS maximum segment size 921MSTP Multiple Spanning Tree Protocol 922MT machine translation 923MTA mail transfer agent 924MTBF mean time between failures 925MTP media transfer protocol 926MTRR memory type range register 927MTTF mean time to failure 928MTU maximum transmission unit 929MUA mail user agent 930MUD multi-user domain 931MVCC multiversion concurrency control 932MWE module width encoding 933MX mail exchange 934NACK negative acknowledgement 935NAK negative acknowledgement 936NAN not a number 937NAPT Network Address Port Translation 938NAS network attached storage 939NAT network address translation 940NAV network allocation vector 941NC numerical control 942NCO numerically-controlled oscillator 943NCP Network Control Protocol 944NCQ native command queuing 945ND neighbor discovery 946NDFA nondeterministic finite automaton 947NE numeric error 948NEWS Network extensible Window System 949NFA nondeterministic finite automaton 950NFC near-field communication 951NFCI no functional change intended 952NFS network file system 953NFV network function virtualization 954NIA next instruction address 955NIC network information center 956NIC network interface card 957NIDS network intrusion detection system 958NIP network interface protocol 959NIPS network intrusion prevention system 960NIS network information service 961NIST National Institute of Standards and Technology 962NLS native language support 963NMI non-maskable interrupt 964NNTP Network News Transfer Protocol 965NOC network operations center 966NOP no operation 967NOS network operating system 968NP nondeterministic polynomial time 969NRND not recommended for new designs 970NRZ non-return to zero 971NSA nation-state adversary 972NSA no such agency 973NSA National Security Agency 974NTM non-deterministic Turing machine 975NTP Network Time Protocol 976NUMA non-uniform memory access 977NVRAM non-volatile random access memory 978NW not write-through 979NX no execute 980OAEP optimal asymmetric encryption padding 981OAM operations, administration, and {management,maintenance} 982OBO off by one 983OBOE off by one error 984OCL object constraint language 985OCR optical character recognition 986ODCM on-demand clock modulation 987ODT on-die termination 988OEM original equipment manufacturer 989OFB output feedback 990OFDM orthogonal frequency division multiplexing 991OFET organic field-effect transistor 992OLAP online analytical processing 993OLE object linking and embedding 994OLTP online transaction processing 995ONFI open nand flash interface 996OO OpenOffice 997OO object oriented 998OOB out of band 999OOE out of order execution 1000OOM out of memory 1001OOO OpenOffice.org 1002OOP object oriented programming 1003OOPS object oriented programming systems 1004OOSE object oriented software engineering 1005OPM operations per minute 1006OPS operations per second 1007OQL Object Query Language 1008ORB object request broker 1009ORM object-relational mapping 1010OS operating system 1011OSD open source definition 1012OSF open software foundation 1013OSI Open Source Initiative 1014OSI open systems interconnection 1015OSPF open shortest path first 1016OSPM OS power management 1017OSS open sound system 1018OSS open source software 1019OSVW operating system visible workarounds 1020OTP one time password 1021OTP open telecom platform 1022OU organizational unit 1023OUI organizationally unique identifier 1024OWL Web Ontology Language 1025P2P PCI to PCI 1026P2P peer to peer 1027PA phase accumulator 1028PA physical address 1029PAAS platform as a service 1030PAC phase-amplitude converter 1031PAE physical address extension 1032PAL phase alternating line 1033PAL programmable array logic 1034PAM pluggable authentication modules 1035PAM pulse amplitude modulation 1036PAP password authentication protocol 1037PAT page attribute table 1038PAT port address translation 1039PATA parallel ATA 1040PAX portable archive exchange 1041PBE pending break encoding 1042PBE programming by example 1043PC personal computer 1044PC program counter 1045PCB printed circuit board 1046PCB process control block 1047PCB Protocol Control Block 1048PCC Portable C Compiler 1049PCD page-level cache disable 1050PCE path computation element 1051PCE performance-monitor counter enable 1052PCEP Path Computation Element Protocol 1053PCH platform controller hub 1054PCI peripheral component interconnect 1055PCM phase change memory 1056PCM pulse code modulation 1057PCMCIA Personal Computer Memory Card International Association 1058PCP Port Control Protocol 1059PD public domain 1060PDA personal digital assistant 1061PDA pushdown automaton 1062PDAG propositional directed acyclic graph 1063PDB power distribution board 1064PDF portable document format 1065PDM pulse-duration modulation 1066PDN pull-down network 1067PDP page {descriptor,directory} page 1068PDS product data sheet 1069PDU protocol data unit 1070PE protection enable 1071PEAP Protected EAP 1072PECI platform environment control interface 1073PEP protocol extension protocol 1074PER packed encoding rules 1075PFS perfect forward secrecy 1076PGAS partitioned global address space 1077PGE page global enable 1078PGP Pretty Good Privacy 1079PHB PCI host bridge 1080PHP PHP: Hypertext Preprocessor 1081PIC performance instrumentation counters 1082PIC position independent code 1083PIC programmable interrupt controller 1084PICNIC problem in chair, not in computer 1085PID process id 1086PIE position independent executable 1087PIL Priority Interrupt Level 1088PIM personal information manager 1089PIM platform-independent model 1090PIO programmed input/output 1091PIPT physically indexed, physically tagged 1092PIQ prefetch input queue 1093PIT programmable interrupt timer 1094PIV personal identity verification 1095PIX Private Internet eXchange 1096PKCS public-key cryptography standards 1097PKI public key infrastructure 1098PLC programmable logic controller 1099PLD programmable logic device 1100PLL phase locked loop 1101PLRU pseudo LRU 1102PLTM package level thermal management 1103PM power management 1104PM {phase,pulse} modulation 1105PMC performance monitoring counters 1106PME power management event 1107PMEG page map entry group 1108PMI performance monitoring infrastructure 1109PMI platform management interrupt 1110PMIC power management integrated circut 1111PMIO port-mapped input/output 1112PMT photo-multiplier tube 1113PMU performance monitoring units 1114PMU power management unit 1115PNG portable network graphics 1116PNP plug and play 1117POE power over ethernet 1118POF probability of failure 1119POP Post Office Protocol 1120POP power on password 1121POSIX Portable Operating System Interface [for Unix] 1122POST power on self test 1123POTS plain old telephone system 1124POWER Performance Optimization With Enhanced RISC 1125POWERPC Performance Optimization With Enhanced RISC - Performance Computing 1126PP pair programming 1127PPB PCI [to] PCI bridge 1128PPC PowerPC 1129PPC Power Performance Computing 1130PPI pixels per inch 1131PPM pages per minute 1132PPP Point-to-Point Protocol 1133PPPOA Point-to-Point Protocol over ATM 1134PPPOE Point-to-Point Protocol over Ethernet 1135PPU physics processing unit 1136PRAM Parameter RAM 1137PRBS pseudorandom bit sequence 1138PRG pseudorandom generator 1139PRF pseudorandom function [family] 1140PRML partial response, maximum likelihood 1141PRN pseudorandom {noise,number} 1142PRNG pseudorandom number generator 1143PROM programmable read only memory 1144PRP pseudorandom permutation 1145PRU Programmable Realtime Unit 1146PS PostScript 1147PSD power spectral density 1148PSE page size extensions 1149PSK phase shift keying 1150PSK pre-shared key 1151PSTN public switched telephone network 1152PSW program status word 1153PTE page table entry 1154PTLA pseudo top level aggregator 1155PTP page table page 1156PTV perceived target value 1157PU processing unit 1158PUC personal unblocking code 1159PUN physical unit number 1160PV physical volume 1161PVG physical volume group 1162PVI protected-mode virtual interrupt 1163PVST Per-VLAN Spanning Tree 1164PWM pulse width modulation 1165PXE preboot execution environment 1166QA quality assurance 1167QAM quadrature amplitude modulation 1168QAM quality assurance management 1169QBE query by example 1170QC quality control 1171QDI quasi delay insensitive 1172QCIF quarter common intermediate format 1173QOS quality of service 1174QVL qualified vendor list 1175R/O read only 1176R/W read/write 1177RA receiver address 1178RA remote assistance 1179RA resource affinity 1180RA router advertisement 1181RAD rapid application development 1182RAID redundant array of {independent,inexpensive} disks 1183RAM random access memory 1184RAS reliability, availability and serviceability 1185RAS remote access service 1186RAS restartable atomic sequence 1187RAS row address strobe 1188RBF radial basis function 1189RBNF routing backus-naur form 1190RBT red-black tree 1191RC release candidate 1192RC remote control 1193RC run commands 1194RCS Revision Control System 1195RCS revision control system 1196RCU read, copy, update 1197RDB Rigid Disk Block 1198RDBMS relational database management system 1199RDF Resource Description Framework 1200RDM relational data model 1201RDMA remote direct memory access 1202RDRAM Rambus DRAM 1203RE regular expression 1204REST representational state transfer 1205RF radio frequency 1206RFI radio frequency interference 1207RFO request for ownership 1208RGB red green blue 1209RGBA red green blue alpha 1210RGMII reduced gigabit media independent interface 1211RH read hit 1212RHEL Red Hat Enterprise Linux 1213RHL Red Hat Linux 1214RIB routing information base 1215RIFF Resource Interchange File Format 1216RIP Raster Image Processor 1217RIP Routing Information Protocol 1218RIR regional Internet registry 1219RISC reduced instruction set {computer,computing} 1220RKM ROM Kernel Manual 1221RLE run length encoding 1222RLL run length limited 1223RLO right-to-left override 1224RM read miss 1225RMCP Remote Management Control Protocol 1226RMI remote method invocation 1227RMO Relaxed Memory Ordering 1228RMPM rapid memory power management 1229RMS root mean square 1230RMW read, modify, write 1231RNG random number generator 1232ROM read only memory 1233RPC remote procedure call 1234RPKI resource PKI 1235RPL requested privilege level 1236RPM revolutions per minute 1237RPN reverse Polish notation 1238RPVST Rapid Per-VLAN Spanning Tree 1239RR random replacement 1240RR round robin 1241RS relay station 1242RSA Rivest, Shamir, [and] Adleman 1243RSIP Realm Specific IP 1244RSN Robust Secure Network 1245RSS really simple syndication 1246RSS residual sum of squares 1247RSTP Rapid Spanning Tree Protocol 1248RT real time 1249RTC real time clock 1250RTC real time computing 1251RTF rich text format 1252RTL register transfer language 1253RTL resistor-transistor logic 1254RTL right to left 1255RTOS real time operating system 1256RTS request to send 1257RTT round trip time 1258RUP rational unified process 1259RW Rabin-Williams 1260RWM read-write memory 1261RX {receive,receiver} 1262S/PDIF Sony/Philips Digital Interface Format 1263SA security advisory 1264SA security association 1265SA source address 1266SA structured analysis 1267SAAS software as a service 1268SACD super audio compact disc 1269SAD security association database 1270SAL {service,system} abstraction layer 1271SAM serial access memory 1272SAM sum addressed memory 1273SAML security assertion markup language 1274SAN storage area network 1275SAP service access point 1276SAPIC streamlined advanced programmable interrupt controller 1277SASD structured analysis, structured design 1278SASI Shugart Associates System Interface 1279SASL simple authentication [and] security layer 1280SATA serial advanced technology attachment 1281SAX simple API for XML 1282SB sound blaster 1283SBU standard build unit 1284SC store conditional 1285SCA source code analyzer 1286SCADA supervisory control and data acquisition 1287SCC single chip cloud 1288SCC source code control 1289SCCS Source Code Control System 1290SCI scalable coherent interface 1291SCI system control interrupt 1292SCM software configuration management 1293SCM source code management 1294SCM storage-class memory 1295SCO synchronous connection orientated 1296SCP secure copy 1297SCSI Small Computer System Interface 1298SCTP Stream Control Transmission Protocol 1299SDEI software delegated exception interface 1300SDI symbol deinterleave 1301SDK software development kit 1302SDL Simple Declarative Language 1303SDL Simple Direct-media Layer 1304SDLC {software,system,systems} development life cycle 1305SDN software defined networking 1306SDP Session Description Protocol 1307SDRAM synchronous dynamic random access memory 1308SDS software defined storage 1309SDT syntax-directed translation 1310SEA synchronous external abort 1311SEGV segmentation violation 1312SEO search engine optimization 1313SES SCSI enclosure services 1314SFC sequential function chart 1315SFI simple firmware interface 1316SFI software fault isolation 1317SFTP SSH File Transfer Protocol 1318SFTP Serial File Transfer Protocol 1319SFTP Simple File Transfer Protocol 1320SGMII serial gigabit media independent interface 1321SGRAM synchronous graphics random access memory 1322SHA secure hash algorithm 1323SIDH supersingular isogeny Diffie-Hellman 1324SIEM security information and event management 1325SIF source input format 1326SIFS short inter-frame space 1327SIM subscriber identity module 1328SIMD single instruction, multiple data 1329SIMM single inline memory module 1330SIP Session Initiation Protocol 1331SIR signal-to-interference ratio 1332SIR slow infrared 1333SISD single instruction, single data 1334SLAAC stateless address auto-configuration 1335SLC single-level cell 1336SLDRAM synchronous-link dynamic random access memory 1337SLED single large expensive disk 1338SLI scalable link interface 1339SLI scan-line interleave 1340SLIC system license internal code 1341SLOC source lines of code 1342SLRU segmented LRU 1343SMA smart memory access 1344SMAF system management action field 1345SMAP Simple Mail Access Protocol 1346SMAP supervisor mode access prevention 1347SMART self-monitoring analysis and reporting technology 1348SMB Server Message Block 1349SMB system management bus 1350SMBIOS System Management BIOS 1351SMC system management controller 1352SMD storage module device 1353SMEP supervisor mode execution protection 1354SMF single mode fiber 1355SMI structure of management information 1356SMI system management interrupt 1357SMM system management mode 1358SMP symmetric multiprocessing 1359SMT simultaneous multithreading 1360SMTP Simple Mail Transfer Protocol 1361SMU system management unit 1362SNA systems network architecture 1363SNAP Sub-Network Access Protocol 1364SNIA Storage Networking Industry Association 1365SNMP Simple Network Management Protocol 1366SNR signal-to-noise ratio 1367SOA service oriented architecture 1368SOAP Simple Object Access Protocol 1369SOC system on chip 1370SOF start of frame 1371SOH start of header 1372SOHO small office/home office 1373SOL serial over LAN 1374SOM system on module 1375SP service pack 1376SP stack pointer 1377SPA storage pool allocator 1378SPARC scalable processor architecture 1379SPARQL SPARQL Protocol and RDF Query Language 1380SPD security policy database 1381SPD serial presence detect 1382SPDIF Sony/Philips digital interface format 1383SPI serial peripheral interface 1384SPI stateful packet inspection 1385SPL system interrupt priority level 1386SPL spinlock 1387SPMD single process, multiple data 1388SPR special purpose register 1389SPT sectors per track 1390SQA software quality assurance 1391SQCIF sub quarter common intermediate format 1392SQL Structured Query Language 1393SRAM static random access memory 1394SRC sample rate conversion 1395SRP SCSI RDMA protocol 1396SS self-snoop 1397SS stack segment 1398SSA static single assignment 1399SSAP source service access point 1400SSB single-sideband modulation 1401SSD solid state drive 1402SSE streaming SIMD extensions 1403SSFDC solid state floppy disc card 1404SSH secure shell 1405SSI server side includes 1406SSID service set identifier 1407SSL secure sockets layer 1408SSP stack smashing protection 1409STC software thermal control 1410STD state transition diagram 1411STOMP Streaming Text Oriented Messaging Protocol 1412STP Spanning Tree Protocol 1413STP shielded twisted pair 1414SUN Stanford University Network 1415SUS Single Unix Specification 1416SUT system under test 1417SVG scalable vector graphics 1418SVGA Super Video Graphics Array 1419SVI {switch,switched} virtual interface 1420SVM secure virtual machine 1421SVM support vector machine 1422SVR System V Release 1423SVS Separate Virtual Space 1424SWF Shockwave Flash 1425SWIG simplified wrapper [and] interface generator 1426SYR symbol timing recovery 1427TA test assertion 1428TA transmitter address 1429TAI international atomic time 1430TAO track at once 1431TAOCP The Art of Computer Programming 1432TAP Test Anything Protocol 1433TAS test and set 1434TB terabyte 1435TBNF transitional backus-naur form 1436TCB trace capture buffer 1437TCB trusted computing base 1438TCC thermal control circuit 1439TCL tool command language 1440TCP Transmission Control Protocol 1441TCQ tagged command queueing 1442TDC time [to] digital converter 1443TDD test-driven development 1444TDD time division duplex 1445TDM time division multiplexing 1446TDMA time division multiple access 1447TDOA time difference of arrival 1448TDP thermal design {point,power} 1449TECO Text Editor and Corrector 1450TFT thin film transistor 1451TFTP Trivial File Transfer Protocol 1452TIAS try it and see 1453TIFF tagged image file format 1454TITS try it to see 1455TK temporal key 1456TKIP Temporal Key Integrity Protocol 1457TLA top level aggregator 1458TLB translation lookaside buffer 1459TLD top level domain 1460TLI transport layer interface 1461TLS thread local storage 1462TLS transport layer security 1463TM Turing machine 1464TM thermal monitor 1465TMDS transition minimized differential signaling 1466TMO timeout 1467TOD time of day 1468TOS terms of service 1469TOS trusted operating system 1470TOS type of service 1471TP transaction processing 1472TPI tracks per inch 1473TPM transactions per minute 1474TPM trusted platform module 1475TPR task priority register 1476TPS transactions per second 1477TPS transmission parameters signaling 1478TR task register 1479TR token ring 1480TRL timing recovery loop 1481TRNG true random number generator 1482TS terminal services 1483TS time series 1484TS time stamp 1485TS transport stream 1486TSAN Thread Sanitizer 1487TSC time stamp counter 1488TSD time stamp disable 1489TSDB time series database 1490TSL test, set, lock 1491TSO time sharing option 1492TSO Total Store Ordering 1493TSP Time-Stamp Protocol 1494TSP Tunnel Setup Protocol 1495TSP time synchronization protocol 1496TSP traveling salesman problem 1497TSS task state segment 1498TTL time to live 1499TTL transistor-transistor logic 1500TTM translation table maps 1501TTY teletype 1502TUI {terminal,text-based,textual} user interface 1503TX {transmit out,transmitter} 1504TXG transaction group 1505TZ time zone 1506UAC user {access,account} control 1507UAF use-after-free 1508UART universal asynchronous receiver/transmitter 1509UAT user acceptance testing 1510UB undefined behavior 1511UBSAN Undefined Behavior Sanitizer 1512UC uncacheable 1513UCS uniform-cost search 1514UDMA ultra DMA 1515UDO ultra density optical 1516UDP User Datagram Protocol 1517UEFI unified extensible firmware interface 1518UFS Unix File System 1519UGA universal graphics adapter 1520UI unit interval 1521UI user interface 1522UICC universal integrated circuit card 1523UID unique identifier 1524UID user identifier 1525UL upload 1526UMA uniform memory access 1527UMA upper memory area 1528UMB upper memory block 1529UML unified modeling language 1530UMPC ultra-mobile PC 1531UPNP universal plug and play 1532UPS uninterruptible power supply 1533URI uniform resource identifier 1534URL uniform resource locator 1535URN uniform resource name 1536USART universal synchronous/asynchronous receiver/transmitter 1537USB universal serial bus 1538USWC uncacheable speculative write combining 1539UT unit test 1540UTC coordinated universal time 1541UTP unshielded twisted pair 1542UUCP Unix-to-Unix Copy Protocol 1543UUID universally unique identifier 1544UUOC useless use of cat 1545UUT unit under test 1546UX user experience 1547VA vertical alignment 1548VA virtual address 1549VA volt-ampere 1550VAX virtual address extension 1551VB Visual Basic 1552VCA variable-gain amplifier 1553VCC common collector voltage 1554VCF voltage-controlled filter 1555VCM virtual channel memory 1556VCO voltage-controlled oscillator 1557VCS version control system 1558VESA Video Electronics Standards Association 1559VFO variable-frequency oscillator 1560VFS virtual file system 1561VG volume group 1562VGA Video Graphics Array 1563VHDCI very high density cable interconnect 1564VID {VLAN,voltage level} identifier 1565VIM Vi IMproved 1566VIPT virtually indexed, physically tagged 1567VIVT virtually indexed, virtually tagged 1568VLAN virtual local area network 1569VLIW very long instruction word 1570VLSI very large scale integration 1571VLSM variable length subnet mask 1572VM virtual {machine,memory} 1573VME virtual mode extension 1574VMX vector multimedia extensions 1575VMX virtual machine extensions 1576VOD video on demand 1577VPN virtual private network 1578VR virtual reality 1579VRAM video random access memory 1580VRF virtual routing and forwarding 1581VRM voltage regulator module 1582VRRP Virtual Router Redundancy Protocol 1583VSTP VLAN Spanning Tree Protocol 1584VTP VLAN Trunking Protocol 1585W watt 1586W3C World Wide Web Consortium 1587WAFL write anywhere file layout 1588WAMP Web Application Messaging Protocol 1589WAN wide area network 1590WAP Wireless Application Protocol 1591WAP wireless access point 1592WDM Windows Driver Model 1593WDDM Windows Display Driver Model 1594WDT watchdog timer 1595WEP Wired Equivalent Privacy 1596WFI wait for interrupt 1597WFQ weighted fair queuing 1598WH write hit 1599WIFI wireless fidelity 1600WLAN wireless local area network 1601WM write miss 1602WMI Windows Management Instrumentation 1603WOL Wake-on-LAN 1604WOM Wake-on-Modem 1605WOR Wake-on-Ring 1606WORM write once read many 1607WP WordPerfect 1608WP word processor 1609WP write protect 1610WPA Wi-Fi Protected Access 1611WPA2 Wi-Fi Protected Access II 1612WPS Wi-Fi Protected Setup 1613WRAM window random access memory 1614WS web services 1615WTC write through caching 1616WWAN wireless wide area network 1617WWW world wide web 1618WYSIAYG what you see is all you get 1619WYSIWYG what you see is what you get 1620XBAR crossbar 1621XDMCP X Display Manager control protocol 1622XER XML encoding rules 1623XGA Extended Graphics Array 1624XHR XMLHttpRequest 1625XIP execute in place 1626XML Extensible Markup Language 1627XNA XNA's not acronymed 1628XNS Xerox network systems 1629XOR exclusive or 1630XP extreme programming 1631XSI X/Open System Interface 1632XSL extensible stylesheet language 1633XSS cross site scripting 1634XT extended technology 1635XTI X/Open transport interface 1636XUL XML user interface language 1637YACC yet another compiler compiler 1638YAML YAML ain't markup language 1639YANG yet another next generation 1640YAWPFAPR you are welcome; please file a problem report 1641YP Yellow Pages 1642YTD year to date 1643ZAP ZFS attribute processor 1644ZBR zone bit recording 1645ZFOD zero-filled on demand 1646ZFS zettabyte file system 1647ZIF zero insertion force 1648ZIFS zero insertion force socket 1649ZIL ZFS intent log 1650ZMA zone multicast address 1651ZPL ZFS Posix layer 1652ZVOL ZFS Volume 1653