acronyms.comp revision 1.238
1$NetBSD: acronyms.comp,v 1.238 2019/04/02 00:48:10 uwe 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 8ABR available bit rate 9ABRT automatic bug reporting tool 10AC alternating current 11ACI adjacent channel interferer 12ACID atomicity, consistency, isolation, durability 13ACK Amsterdam compiler kit 14ACK acknowledgement 15ACL access control list 16ACL active current loop 17ACL asynchronous connection less 18ACP auxiliary control {process,program} 19ACPI advanced configuration and power interface 20ACS access control set 21ACU automatic calling unit 22ADB Apple desktop bus 23ADC analog [to] digital converter 24ADD acronym driven development 25ADO active data objects 26ADP automatic data processing 27ADPCM adaptive differential pulse code modulation 28ADS alternate data stream 29ADSL asymmetric digital subscriber line 30ADT abstract data type 31AER advanced error reporting 32AES Advanced Encryption Standard 33AFP Apple Filing Protocol 34AFS Andrew File System 35AGC automatic gain control 36AGP accelerated graphics port 37AI analog input 38AI artificial intelligence 39AL access list 40AL active link 41ALE address latch enable 42ALS ambient light sensor 43ALU arithmetic and logical unit 44ALUA asymmetric logical unit access 45AM access method 46AM alignment mask 47AM amplitude modulation 48AMD Advanced Micro Devices Inc 49AMDD Agile model-driven development 50AMI alternate mark inversion 51AMP asymmetric multiprocessing 52AMQP advanced message queuing protocol 53AMT active management technology 54AN Arabic number 55ANR application not responding 56ANSI American National Standards Institute 57AO analog output 58AOL Alert-on-LAN 59AOS add or subtract 60AP access point 61AP application processor 62API application programming interface 63APEI ACPI platform error interface 64APIC advanced programmable interrupt controller 65APIPA automatic private IP addressing 66APM advanced power management 67APM application performance management 68APU accelerated processing unit 69APT advanced persistent threat 70AQM active queue management 71ARAT always running APIC timer 72ARC adaptive replacement cache 73ARC Advanced RISC Computing 74ARC automatic reference counting 75ARM Advanced RISC Machines 76ARP Address Resolution Protocol 77ARPA Advanced Research Projects Agency 78ARQ automatic repeat request 79ARR address range register 80ARU audio response unit 81AS autonomous system 82ASA Adaptive Security Appliance 83ASAN Address Sanitizer 84ASC advanced smart cache 85ASCII American Standard Code for Information Interchange 86ASD agile software development 87ASE advanced software environment 88ASF alert standard format 89ASIC application-specific integrated circuit 90ASK amplitude shift keying 91ASLR address space layout randomization 92ASN autonomous system number 93ASP active server pages 94ASP auxiliary storage pool 95ASPM active state power management 96ASQ automated software quality 97ASR address space register 98AST abstract syntax tree 99AST asynchronous system trap 100AT access time 101AT advanced technology 102ATA advanced technology attachment 103ATAPI advanced technology attachment packet interface 104ATC address translation cache 105ATM asynchronous transfer mode 106ATX advanced technology extended 107AV anti virus 108AVB audio video bridging 109AVL Adelson-Velsky-Landis 110AVX advanced vector extensions 111BA byte align 112BAL basic assembly language 113BAR base address register 114BBS bulletin board system 115BCC blind carbon copy 116BCD binary coded decimal 117BCR byte count register 118BCS base configuration space 119BD baud 120BDD binary decision diagram 121BDI bit deinterleave 122BDUF big design up front 123BEDO burst extended data output 124BER basic encoding rules 125BER bit error {rate,ratio} 126BERT boot error record table 127BFD binary {file,format} descriptor 128BFKL big fscking kernel lock 129BFS breadth-first search 130BFT binary file transfer 131BGA ball grid array 132BGP Border Gateway Protocol 133BGPSEC BGP Security 134BIND Berkeley Internet Name Daemon 135BIOS Basic Input/Output System 136BIOS built-in operating system 137BIST built-in self-test 138BIU bus interface unit 139BKDG BIOS and kernel developer's guide 140BLAS basic linear algebra subprograms 141BLC back light control 142BLOB binary large object 143BM bus master 144BMC baseboard management controller 145BMIC bus master interface controller 146BN boundary neutral 147BNF Backus-Naur form 148BO binary output 149BOF beginning of file 150BOM beginning of message 151BOM byte order mark 152BP base pointer 153BP boot processor 154BPB BIOS parameter block 155BPDU bridge protocol data unit 156BPF Berkeley Packet Filter 157BPI bits per inch 158BPM business process modelling 159BPS bits per second 160BPSK binary phase shift keying 161BQS Berkeley quality software 162BRE basic regular expression 163BS backspace 164BS binary sequence 165BSA basic service area 166BSD Berkeley Software Distribution 167BSDP Boot Service Discovery Protocol 168BSF bit scan forward 169BSOD blue screen of death 170BSP binary space partition 171BSP board support package 172BSP bootstrap processor 173BSR bit scan reverse 174BSS basic service set 175BSS block started by symbol 176BSSID basic service set identifier 177BT BitTorrent 178BT Bluetooth 179BT bit test 180BTC bit test [and] complement 181BTM bus transport mechanism 182BTR bit test [and] reset 183BTS bit test [and] set 184BTS bug tracking system 185BW bandwidth 186BWM block-write mode 187BUAG big ugly ASCII graphic 188CA certificate authority 189CAD computer-aided design 190CAM computer assisted manufacturing 191CAM conditional access module 192CAM content addressable memory 193CARP Common Address Redundancy Protocol 194CAS column address strobe 195CAS compare and swap 196CAS computer algebra system 197CASE computer aided software engineering 198CAU control access unit 199CAV constant angular velocity 200CBC cipher block chaining 201CBR constant bit rate 202CC carbon copy 203CCD charge coupled device 204CCI co-channel interferer 205CCNUMA cache-coherent non-uniform memory access 206CD cache disable 207CD compact disc 208CDDA compact disc digital audio 209CDMA code division multiple access 210CDP Cisco Discovery Protocol 211CDRAM cache dynamic random access memory 212CER canonical encoding rules 213CF compact flash 214CFB cipher feedback 215CFG context-free grammar 216CFG control-flow graph 217CFI control-flow integrity sanitizer 218CG control gate 219CGA Color Graphics Adapter 220CGI common gateway interface 221CGN Carrier-Grade NAT 222CHAP Challenge-Handshake Authentication Protocol 223CHS cylinder/head/sector 224CI continuous integration 225CI {common,component} interface 226CIDR Classless Inter-Domain Routing 227CIF common intermediate format 228CIFS Common Internet File System 229CIL common intermediate language 230CIR carrier-to-interference ratio 231CIS contact image sensor 232CISC complex instruction set {computer,computing} 233CJK Chinese, Japanese, [and] Korean 234CLF common log format 235CLI command line interface 236CLR common language runtime 237CLTT closed loop thermal throttling 238CLUT color look-up table 239CLV constant linear velocity 240CM configuration management 241CMA concert multithread architecture 242CMC chassis management controller 243CMC corrected machine check 244CMS {configuration,content,course} management system 245CMI control {management,method} interface 246CMOS complementary metal-oxide-semiconductor 247CMP chip multi-processing 248CMS content management system 249CMYK cyan magenta yellow black 250CN {common,canonical} name 251CNC computer numerical control 252CNR carrier-to-noise ratio 253COF current operating frequency 254COFDM coded orthogonal frequency division multiplexing 255COFF common object file format 256COM component object model 257COM computer on module 258COMA cache-only memory architecture 259CORBA common object request broker architecture 260COS class of service 261COW copy-on-write 262CP continuous pilot 263CPB core performance boost 264CPC central processor complex 265CPC cpu performance counters 266CPE common phase error 267CPE common platform enumeration 268CPER common platform error record 269CPG clock pulse generator 270CPI cycles per instruction 271CPL current privilege level 272CPLD complex programmable logic device 273CPP C preprocessor 274CPS characters per second 275CPT command pass through 276CPU central processing unit 277CR carriage return 278CRC cyclic redundancy check 279CRL carrier recovery loop 280CRLF carriage return line feed 281CRT cathode ray tube 282CRUD create, read, update, and delete 283CS cable select 284CS chip select 285CS code segment 286CS computer science 287CSDL {common,conceptual} schema definition language 288CSI channel state information 289CSI common system interface 290CSMA carrier sense multiple access 291CSMA/CA carrier sense multiple access with collision avoidance 292CSMA/CD carrier sense multiple access with collision detection 293CSR control [and] status registers 294CSRG Computer Systems Research Group 295CSS cascading style sheets 296CSV comma-separated values 297CTF compact c type format 298CTM close to metal 299CTR counter [mode] 300CTS clear to send 301CUA common user access 302CUT coordinated universal time 303CV control voltage 304CVE common vulnerabilities and exposures 305CVS Concurrent Versions System 306DA destination address 307DAA distributed application architecture 308DAB digital audio broadcasting 309DAC digital [to] analog converter 310DAC discretionary access control 311DAD duplicate address detection 312DANE DNS-based Authentication of Named Entities 313DAO disk at once 314DAP Directory Access Protocol 315DAT digital audio tape 316DAT dynamic acceleration technology 317DB database 318DBA database administrator 319DBA dynamic bandwidth allocation 320DBB data bus buffer 321DBC design by contract 322DBL dynamic buffer limiting 323DBMS database management system 324DBS database server 325DC direct current 326DCC Direct Client-to-Client 327DCC direct cable connect 328DCD data carrier detect 329DCE data control equipment 330DCE distributed computing environment 331DCIM data center infrastructure management 332DCIM digital camera images 333DCL Digital Command Language 334DCOM distributed component object model 335DCOP Desktop COmmunication Protocol 336DCS data collection systems 337DCT discrete cosine transform 338DCU data cache unit 339DDC display data channel 340DDE dynamic data exchange 341DDK device driver kit 342DDL data description language 343DDR double data rate 344DDS direct digital sound 345DDWG Digital Display Working Group 346DE debugging extensions 347DE desktop environment 348DEA data encryption algorithm 349DEC Digital Equipment Corporation 350DEK data encryption key 351DEP data execution prevention 352DER distinguished encoding rules 353DES Data Encryption Standard 354DF don't fragment 355DFA deterministic finite automaton 356DFC data flow control 357DFS depth first search 358DFS distributed file system 359DFSAN Data Flow Sanitizer 360DFT diagnostic function test 361DFT discrete Fourier transform 362DGL data generation language 363DH Diffie-Hellman 364DHCP Dynamic Host Configuration Protocol 365DIFS distributed inter-frame space 366DIMM dual inline memory module 367DIRT design in real time 368DL diode logic 369DL discrete logarithm 370DL download 371DLE data link escape 372DLL dynamic link library 373DLP discrete logarithm problem 374DMA direct memory access 375DMI desktop management interface 376DMS document management system 377DMT discrete multitone modulation 378DMU data management layer 379DNARD Digital network appliance reference design 380DND drag and drop 381DNLC directory name lookup cache 382DNS Domain Name System 383DNSSEC DNS Security Extensions 384DOE distributed object environment 385DOF data over fibre 386DOM document object model 387DOS denial of service 388DOS disk operating system 389DP DisplayPort 390DPC deferred procedure call 391DPCM differential pulse code modulation 392DPD dead peer detection 393DPI deep packet inspection 394DPI dots per inch 395DPL descriptor privilege level 396DPS Display PostScript 397DPST display power savings technology 398DRAAS disaster recovery as a service 399DRAM dynamic random access memory 400DRBG deterministic random bit generator 401DRI direct rendering infrastructure 402DRM digital rights management 403DRRS display refresh rate switching 404DS debug store 405DSA digital signature algorithm 406DSAP destination service access point 407DSB double-sideband modulation 408DSDT differentiated system descriptor table 409DSL dataset and snapshot layer 410DSL digital subscriber line 411DSL domain specific language 412DSLAM digital subscriber line access multiplexer 413DSN delivery status notification 414DSO dynamic shared object 415DSP digital signal processor 416DSSS direct sequence spread spectrum 417DTD document type definition 418DTE data terminal equipment 419DTE dumb terminal emulator 420DTL diode-transistor logic 421DTLS datagram transport layer security 422DTS digital thermal sensor 423DUT device under test 424DVB digital video broadcasting 425DVCS distributed version control system 426DVD digital versatile disc 427DVFS dynamic voltage and frequency scaling 428DVI device independent 429DVI Digital Visual Interface 430DVR digital video recorder 431E-XER extended XML encoding rules 432EABI embedded-application binary interface 433EAI Email Address Internationalization 434EAI Enterprise Application Integration 435EAP Extensible Authentication Protocol 436EAPOL EAP over Lan 437EBCDIC Extended Binary Coded Decimal Interchange Code 438EBDA Extended BIOS Data Area 439EBR extended boot record 440EC elliptic curve 441ECC elliptic curve cryptography 442ECC error correction code 443ECDH elliptic curve Diffie-Hellman 444ECDL elliptic curve discrete logarithm 445ECDLP elliptic curve discrete logarithm problem 446ECDSA elliptic curve digital signature algorithm 447ECL emitter-coupled logic 448ECN explicit congestion notification 449ECP enhanced capability port 450ECS enhanced chip set 451ECS extended configuration space 452EDAC error detection and correction 453EDAT enhanced dynamic acceleration technology 454EdDSA Edwards curve digital signature algorithm 455EDGE explicit data graph execution 456EDID extended display identification data 457EDO extended data out 458EDS electronical data sheet 459EEE energy efficient ethernet 460EEPROM electrically erasable programmable read only memory 461EFI extensible firmware interface 462EFL emitter follower logic 463EFM eight to fourteen modulation 464EGA Enhanced Graphics Adapter 465EGP exterior gateway protocol 466EH extension header 467EIDE enhanced IDE 468EISA extended industry standard architecture 469EINJ error injection table 470ELF executable and linking format 471ELS entry level system 472EMI electro-magnetic interference 473EMP electro-magnetic pulse 474EMR electro-magnetic radiation 475EMACS Editor MACroS 476EOF end of file 477EOI end of interrupt 478EOIS end of interactive support 479EOL end of life 480EOL end of line 481EOT end of transmission 482EPIC explicitly parallel instruction computing 483EPP enhanced parallel port 484EPRML extended partial response, maximum likelihood 485EPROM erasable programmable read only memory 486ERD emergency recovery disk 487ERD entity relationship diagram 488ERE extended regular expression 489ERST error record serialization table 490ESAN Efficiency Sanitizer 491ESB enterprise service bus 492ESDI enhanced small disk interface 493ESDRAM enhanced synchronous dynamic random access memory 494ESI enclosure services interface 495ESS electronic switching system 496ESS extended service set 497ESSID extended service set identifier 498EST enhanced speedstep 499ETL extract, transform, load 500EU execution unit 501EULA end user license agreement 502FAT file allocation table 503FBRAM frame buffer random access memory 504FCIF full common intermediate format 505FCL fiber channel loop 506FCS frame check sequence 507FDC floppy disk controller 508FDD floppy disk drive 509FDDI fiber distributed data interface 510FDE full disk encryption 511FDT flattened device tree 512FEA finite element analysis 513FEC forward error correction 514FET field-effect transistor 515FF finite field 516FF form feed 517FFDH finite-field Diffie-Hellman 518FFH functional fixed hardware 519FFI foreign function interface 520FFM focus follows mouse 521FFS Fast File System 522FFS find first set 523FFT fast Fourier transform 524FG floating gate 525FHSS frequency hop spread spectrum 526FID frequency identifier 527FIFO first in, first out 528FILO first in, last out 529FIPS Federal Information Processing Standards 530FIR fast infrared 531FLOPS floating [point] operations per second 532FLOSS free/libre/open source software 533FM frequency modulation 534FMR false match rate 535FOSS free/open source software 536FPGA field programmable gate array 537FPM fast page mode 538FPR floating point register 539FPU floating point unit 540FQDN fully qualified domain name 541FRR false rejection rate 542FRU field replaceable unit 543FS file system 544FSB front side bus 545FSCK file system check 546FSF Free Software Foundation 547FSK frequency shift keying 548FSM finite-state machine 549FTA fault tree analysis 550FTL flash translation layer 551FTP File Transfer Protocol 552FTPS File Transfer Protocol Secure 553FUS fast user switching 554FWH firmware hub 555FWS folding white space 556GAL generic array logic 557GAS generic address structure 558GC garbage collector 559GCM Galois counter mode 560GCR group-coded recording 561GDI Graphics Device Interface 562GDT global descriptor table 563GEM graphics environment manager 564GEM graphics execution manager 565GENA general event notification architecture 566GHC Glasgow Haskell compiler 567GHES generic hardware error source 568GIC generic interrupt controller 569GID group identifier 570GIF graphics interchange format 571GMCH graphics and memory controller hub 572GNU GNU's Not Unix 573GOP graphics output protocol 574GOT global offset table 575GPE general purpose event 576GPF general protection fault 577GPG GNU Privacy Guard 578GPL [GNU] General Public License 579GPR general purpose register 580GPS generalized processor sharing 581GPT GUID partition table 582GPU graphics processing unit 583GR golden ratio 584GRE generic routing encapsulation 585GSI global system interrupt 586GUI graphical user interface 587GUID globally unique identifier 588GVFS git virtual file system 589HA high availability 590HAL hardware abstraction layer 591HAT hashed array tree 592HATEOAS hypermedia as the engine of application state 593HBA host bus adapter 594HCF halt and catch fire 595HCI host controller interface 596HCI human-computer interaction 597HCL hardware compatibility list 598HDCP High-bandwidth Digital Content Protection 599HDD hard disk drive 600HDL hardware description language 601HDMI High-Definition Multimedia Interface 602HDTV high-definition television 603HECI host embedded controller interface 604HEST hardware error source table 605HF high frequency 606HFM highest frequency mode 607HID human interface device 608HKP HTTP Keyserver Protocol 609HLL high-level language 610HMA high memory area 611HMI human-machine interface 612HOOD hierarchical object oriented design 613HP Hewlett-Packard 614HPC high performance computing 615HPET high precision event timer 616HSM hardware security module 617HSM hierarchical storage management 618HT hyper-threading 619HTC hardware thermal control 620HTCC high temperature co-fired ceramic 621HTML HyperText Markup Language 622HTT hyper-threading technology 623HTTP Hypertext Transfer Protocol 624HTTPS Hypertext Transfer Protocol Secure 625HVM hardware virtual machine 626HVDS High-Voltage Differential Signaling 627HWASAN Hardware-assisted Address Sanitizer 628HZ Hertz 629I2O intelligent input/output 630IA information assurance 631IAAS infrastructure as a service 632IANA Internet Assigned Numbers Authority 633IBC iterated block cipher 634IBM International Business Machines 635IBS instruction based sampling 636IBSS independent basic service set 637IC integrated circuit 638ICA independent computer architecture 639ICB Internet Citizen's Band 640ICE in-circuit emulator 641ICE internal compiler error 642ICH I/O controller hub 643ICMP Internet Control Message Protocol 644ICT information and communications technology 645ICW initialization command word 646IDA Intel dynamic acceleration 647IDCMP Intuition direct communication message port 648IDE integrated development environment 649IDE integrated drive electronics 650IDPS intrusion detection [and] prevention system 651IDRP inter-domain routing protocol 652IDS intrusion detection system 653IDT interrupt descriptor table 654IE Internet Explorer 655IEC International Electrotechnical Commission 656IEEE Institute of Electrical and Electronics Engineers 657IESG Internet Engineering Steering Group 658IETF Internet Engineering Task Force 659IF intermediate frequency 660IFCM isochronous flow control mode 661IFF Interchange File Format 662IFS internal field separator 663IGD Internet gateway device 664IGMP Internet Group Management Protocol 665IGP interior gateway protocol 666IHV independent hardware vendor 667IKE Internet key exchange 668ILM internal loopback mode 669ILOM integrated lights-out management 670ILP instruction level parallelism 671IM instant messaging 672IMAP Internet Message Access Protocol 673IMC integrated memory controller 674IMCR interrupt mode configuration register 675IMR interrupt mask register 676IMS information management system 677IMSI international mobile subscriber identity 678INCITS InterNational Committee for Information Technology Standards 679IO input/output 680IOCTL input/output control 681IOM input/output managers 682IOMMU input/output memory management unit 683IOT Internet of Things 684IP Internet Protocol 685IP intellectual property 686IPC instructions per cycle 687IPC interprocess communication 688IPCF interprocess communication facility 689IPE integrated programming environment 690IPI intelligent peripheral interface 691IPI interprocessor interrupt 692IPL Initial Program Load 693IPL Interrupt Priority Level 694IPMB Intelligent Platform Management Bus 695IPMI Intelligent Platform Management Interface 696IPNG Internet Protocol, Next Generation 697IPS in-plane switching 698IPS intrusion prevention system 699IPSEC Internet Protocol Security 700IRC Internet Relay Chat 701IRDA infrared data association 702IRQ interrupt request 703IRQL interrupt request level 704IRR interrupt request register 705IRTF Internet Research Task Force 706IS information system 707ISA industry standard architecture 708ISA instruction set architecture 709ISDN integrated services digital network 710ISI inter-symbol interference 711ISM industrial, scientific, [and] medical 712ISN initial serial number 713ISO International Standards Organization 714ISOC Internet Society 715ISP Internet service provider 716ISR in-service register 717ISR interrupt service routine 718IST interrupt stack table 719ISV independent software vendor 720IT information technology 721ITB Intel Turbo Boost 722ITIL information technology infrastructure library 723ITP in-target probe 724ITSM IT service management 725IV initialization vector 726IVT interrupt vector table 727JBOD just a bunch of disks 728JCL Job Control Language 729JFET junction [gate] field-effect transistor 730JIT just in time 731JPEG Joint Photographic Experts Group 732JRE Java Runtime Environment 733JSON JavaScript Object Notation 734JTAG joint test action group 735KASLR kernel address space layout randomization 736KB keyboard 737KB kilobyte 738KBD keyboard 739KBD kilobaud 740KCS keyboard controller style 741KLOC thousand lines of code 742KMS kernel-mode setting 743KPI kernel programming interface 744KVA kernel virtual address 745KVM kernel virtual machine 746KVM kernel virtual memory 747KVM keyboard, video, [and] mouse 748LAMP Linux Apache MySQL {Perl,PHP,Python} 749LAN local area network 750LAPIC local advanced programmable interrupt controller 751LAR load access rights 752LBA logical block addressing 753LBS location-based service 754LCD liquid crystal display 755LCP link control protocol 756LDA local delivery agent 757LDAP Lightweight Directory Access Protocol 758LDR light-dependent resistor 759LDT local descriptor table 760LE logical extent 761LED light emitting diode 762LELL low energy link layer 763LER label edge router 764LF line feed 765LF low frequency 766LFM lowest frequency mode 767LFN long file names 768LFO low-frequency oscillation 769LFS log-structured file system 770LFU least frequently used 771LHP loop heat pipe 772LIFO last in, first out 773LILO LInux LOader 774LILO last in, last out 775LINT local interrupt 776LIR local Internet registry 777LISP LISt Processor 778LISP Locator/ID Separation Protocol 779LKM {Linux,loadable} kernel module 780LKML Linux kernel mailing list 781LL load linked 782LL/SC load linked/store conditional 783LLC logical link control 784LLDP link layer discovery protocol 785LLF low level format 786LLMNR link-local multicast name resolution 787LLVM Low Level Virtual Machine 788LM long mode 789LMM link management mode 790LMP link management protocol 791LNO loop nest optimization 792LOC lines of code 793LOM lights-out management 794LPE Linux performance events 795LPC low pin count 796LPS local positioning system 797LRC longitudinal redundancy check 798LRM left-to-right mark 799LRO left-to-right override 800LRU least recently used 801LSAN Leak Sanitizer 802LSB Linux standards base 803LSB least significant {bit,byte} 804LSI large scale integration 805LSL load segment limit 806LSM log structured merge 807LSN Large Scale NAT 808LSN log sequence number 809LSR label switch router 810LTCC low temperature co-fired ceramic 811LTO linear tape-open 812LTO link time optimization 813LTR left to right 814LTR load task register 815LTR letter(-sized paper) 816LTS long term support 817LUA Lua Uppercase Accident 818LUN logical unit number 819LV logical volume 820LVM logical volume management 821LVT local vector table 822LVDS Low-Voltage Differential Signaling 823LWP light-weight process 824LZW Lempel Ziv Welch 825MAC mandatory access control 826MAC {media,medium} access control 827MAC message authentication {check,code} 828MADT multiple APIC descriptor table 829MB megabyte 830MBA multi-boot agent 831MBR master boot record 832MBS megabits per second 833MC memory controller 834MCA machine check architecture 835MCA MicroChannel architecture 836MCC multiversion concurrency control 837MCE machine check exception 838MCGA Multi-Color Graphics Array 839MCH memory controller hub 840MCM multi-chip module 841MCQ memory controlled queue 842MD machine-dependent 843MD-SAL model-driven service abstraction layer 844MDA mail delivery agent 845MDA Monochrome Display Adapter 846MDC Management Data Clock 847MDI Medium Dependent Interface 848MDI-X Medium Dependent Interface Crossover 849MDIO Management Data Input/Output 850MDMX MIPS Digital Media eXtension 851MDRAM multibank dynamic random access memory 852MESI modified, exclusive, shared, invalid 853MFC merge from current 854MFC Microsoft Foundation Classes 855MFM modified frequency modulation 856MFU most frequently used 857MI machine-independent 858MI machine interface 859MIB management information base 860MIC message integrity {check,code} 861MID mobile Internet device 862MIDI musical instrument digital interface 863MIF management information format 864MII media independent interface 865MIM man in the middle 866MIMD multiple instruction, multiple data 867MIME Multipurpose Internet Mail Extensions 868MIMO multiple input multiple output 869MIPS million instructions per second 870MIPS Microprocessor without Interlocked Pipeline Stages 871MISD multiple instruction, single data 872MIT Massachusetts Institute of Technology 873MITM man in the middle 874ML machine language 875ML machine learning 876ML mailing list 877ML markup language 878ML maximum likelihood 879MLC multi-level cell 880MLD multicast listener discovery 881MLHP micro loop heat pipe 882MMF multi-mode fiber 883MMIC monolithic microwave integrated circuit 884MMIO memory mapped input/output 885MMORPG massive multiplayer online role playing game 886MMU memory management unit 887MMX matrix math extension 888MMX multimedia extension 889MMX multiple math extension 890MO magneto-optical 891MOESI modified, owned, exclusive, shared, invalid 892MOF maximum operating frequency 893MOSFET metal-oxide-semiconductor field-effect transistor 894MOSI modified, owned, shared, invalid 895MP multi-platform 896MP multiplayer 897MP {multiprocessing,multiprocessor} 898MPEG moving picture experts group 899MPI message passing interface 900MPLS Multiprotocol Label Switching 901MPP massively parallel processor 902MPS memory pool system 903MPS multiprocessor specification 904MQTT Message Queuing Telemetry Transport 905MR modem ready 906MRU most recently used 907MS Microsoft 908MSAN Memory Sanitizer 909MSB most significant {bit,byte} 910MSC message sequence chart 911MSE mean square error 912MSF minutes seconds frames 913MSI message signaled interrupt 914MSI modified, shared, invalid 915MSR {machine state,model-specific} register 916MSS maximum segment size 917MSTP Multiple Spanning Tree Protocol 918MT machine translation 919MTA mail transfer agent 920MTBF mean time between failures 921MTP media transfer protocol 922MTRR memory type range register 923MTTF mean time to failure 924MTU maximum transmission unit 925MUA mail user agent 926MUD multi-user domain 927MVCC multiversion concurrency control 928MWE module width encoding 929MX mail exchange 930NACK negative acknowledgement 931NAK negative acknowledgement 932NAN not a number 933NAPT Network Address Port Translation 934NAS network attached storage 935NAT network address translation 936NAV network allocation vector 937NC numerical control 938NCO numerically-controlled oscillator 939NCP Network Control Protocol 940NCQ native command queuing 941ND neighbor discovery 942NDFA nondeterministic finite automaton 943NE numeric error 944NEWS Network extensible Window System 945NFA nondeterministic finite automaton 946NFC near-field communication 947NFCI no functional change intended 948NFS network file system 949NFV network function virtualization 950NIA next instruction address 951NIC network information center 952NIC network interface card 953NIDS network intrusion detection system 954NIP network interface protocol 955NIPS network intrusion prevention system 956NIS network information service 957NIST National Institute of Standards and Technology 958NLS native language support 959NMI non-maskable interrupt 960NNTP Network News Transfer Protocol 961NOC network operations center 962NOP no operation 963NOS network operating system 964NP nondeterministic polynomial time 965NRND not recommended for new designs 966NRZ non-return to zero 967NSA nation-state adversary 968NSA no such agency 969NSA National Security Agency 970NTM non-deterministic Turing machine 971NTP Network Time Protocol 972NUMA non-uniform memory access 973NVRAM non-volatile random access memory 974NW not write-through 975NX no execute 976OAEP optimal asymmetric encryption padding 977OAM operations, administration, and {management,maintenance} 978OBO off by one 979OBOE off by one error 980OCL object constraint language 981OCR optical character recognition 982ODCM on-demand clock modulation 983ODT on-die termination 984OEM original equipment manufacturer 985OFB output feedback 986OFDM orthogonal frequency division multiplexing 987OFET organic field-effect transistor 988OLAP online analytical processing 989OLE object linking and embedding 990OLTP online transaction processing 991ONFI open nand flash interface 992OO OpenOffice 993OO object oriented 994OOB out of band 995OOE out of order execution 996OOM out of memory 997OOO OpenOffice.org 998OOP object oriented programming 999OOPS object oriented programming systems 1000OOSE object oriented software engineering 1001OPM operations per minute 1002OPS operations per second 1003OQL Object Query Language 1004ORB object request broker 1005ORM object-relational mapping 1006OS operating system 1007OSD open source definition 1008OSF open software foundation 1009OSI Open Source Initiative 1010OSI open systems interconnection 1011OSPF open shortest path first 1012OSPM OS power management 1013OSS open sound system 1014OSS open source software 1015OSVW operating system visible workarounds 1016OTP one time password 1017OTP open telecom platform 1018OU organizational unit 1019OUI organizationally unique identifier 1020OWL Web Ontology Language 1021P2P PCI to PCI 1022P2P peer to peer 1023PA phase accumulator 1024PA physical address 1025PAAS platform as a service 1026PAC phase-amplitude converter 1027PAE physical address extension 1028PAL phase alternating line 1029PAL programmable array logic 1030PAM pluggable authentication modules 1031PAM pulse amplitude modulation 1032PAP password authentication protocol 1033PAT page attribute table 1034PAT port address translation 1035PATA parallel ATA 1036PAX portable archive exchange 1037PBE pending break encoding 1038PBE programming by example 1039PC personal computer 1040PC program counter 1041PCB printed circuit board 1042PCB process control block 1043PCB Protocol Control Block 1044PCC Portable C Compiler 1045PCD page-level cache disable 1046PCE path computation element 1047PCE performance-monitor counter enable 1048PCEP Path Computation Element Protocol 1049PCH platform controller hub 1050PCI peripheral component interconnect 1051PCM phase change memory 1052PCM pulse code modulation 1053PCMCIA Personal Computer Memory Card International Association 1054PCP Port Control Protocol 1055PD public domain 1056PDA personal digital assistant 1057PDA pushdown automaton 1058PDAG propositional directed acyclic graph 1059PDB power distribution board 1060PDF portable document format 1061PDM pulse-duration modulation 1062PDN pull-down network 1063PDP page {descriptor,directory} page 1064PDS product data sheet 1065PDU protocol data unit 1066PE protection enable 1067PEAP Protected EAP 1068PECI platform environment control interface 1069PEP protocol extension protocol 1070PER packed encoding rules 1071PFS perfect forward secrecy 1072PGAS partitioned global address space 1073PGE page global enable 1074PGP Pretty Good Privacy 1075PHB PCI host bridge 1076PHP PHP: Hypertext Preprocessor 1077PIC performance instrumentation counters 1078PIC position independent code 1079PIC programmable interrupt controller 1080PICNIC problem in chair, not in computer 1081PID process id 1082PIE position independent executable 1083PIL Priority Interrupt Level 1084PIM personal information manager 1085PIM platform-independent model 1086PIO programmed input/output 1087PIPT physically indexed, physically tagged 1088PIQ prefetch input queue 1089PIT programmable interrupt timer 1090PIV personal identity verification 1091PIX Private Internet eXchange 1092PKCS public-key cryptography standards 1093PKI public key infrastructure 1094PLC programmable logic controller 1095PLD programmable logic device 1096PLL phase locked loop 1097PLRU pseudo LRU 1098PLTM package level thermal management 1099PM power management 1100PM {phase,pulse} modulation 1101PMC performance monitoring counters 1102PME power management event 1103PMEG page map entry group 1104PMI performance monitoring infrastructure 1105PMI platform management interrupt 1106PMIC power management integrated circut 1107PMIO port-mapped input/output 1108PMT photo-multiplier tube 1109PMU performance monitoring units 1110PMU power management unit 1111PNG portable network graphics 1112PNP plug and play 1113POE power over ethernet 1114POF probability of failure 1115POP Post Office Protocol 1116POP power on password 1117POSIX Portable Operating System Interface [for Unix] 1118POST power on self test 1119POTS plain old telephone system 1120POWER Performance Optimization With Enhanced RISC 1121POWERPC Performance Optimization With Enhanced RISC - Performance Computing 1122PP pair programming 1123PPB PCI [to] PCI bridge 1124PPC PowerPC 1125PPC Power Performance Computing 1126PPI pixels per inch 1127PPM pages per minute 1128PPP Point-to-Point Protocol 1129PPPOA Point-to-Point Protocol over ATM 1130PPPOE Point-to-Point Protocol over Ethernet 1131PPU physics processing unit 1132PRAM Parameter RAM 1133PRBS pseudorandom bit sequence 1134PRG pseudorandom generator 1135PRF pseudorandom function [family] 1136PRML partial response, maximum likelihood 1137PRN pseudorandom {noise,number} 1138PRNG pseudorandom number generator 1139PROM programmable read only memory 1140PRP pseudorandom permutation 1141PRU Programmable Realtime Unit 1142PS PostScript 1143PSD power spectral density 1144PSE page size extensions 1145PSK phase shift keying 1146PSK pre-shared key 1147PSTN public switched telephone network 1148PSW program status word 1149PTE page table entry 1150PTLA pseudo top level aggregator 1151PTP page table page 1152PTV perceived target value 1153PU processing unit 1154PUC personal unblocking code 1155PUN physical unit number 1156PV physical volume 1157PVG physical volume group 1158PVI protected-mode virtual interrupt 1159PVST Per-VLAN Spanning Tree 1160PWM pulse width modulation 1161PXE preboot execution environment 1162QA quality assurance 1163QAM quadrature amplitude modulation 1164QAM quality assurance management 1165QBE query by example 1166QC quality control 1167QDI quasi delay insensitive 1168QCIF quarter common intermediate format 1169QOS quality of service 1170QVL qualified vendor list 1171R/O read only 1172R/W read/write 1173RA receiver address 1174RA remote assistance 1175RA resource affinity 1176RA router advertisement 1177RAD rapid application development 1178RAID redundant array of {independent,inexpensive} disks 1179RAM random access memory 1180RAS reliability, availability and serviceability 1181RAS remote access service 1182RAS restartable atomic sequence 1183RAS row address strobe 1184RBF radial basis function 1185RBT red-black tree 1186RC release candidate 1187RC remote control 1188RC run commands 1189RCS Revision Control System 1190RCS revision control system 1191RCU read, copy, update 1192RDB Rigid Disk Block 1193RDBMS relational database management system 1194RDF Resource Description Framework 1195RDM relational data model 1196RDMA remote direct memory access 1197RDRAM Rambus DRAM 1198RE regular expression 1199REST representational state transfer 1200RF radio frequency 1201RFI radio frequency interference 1202RFO request for ownership 1203RGB red green blue 1204RGBA red green blue alpha 1205RGMII reduced gigabit media independent interface 1206RH read hit 1207RHEL Red Hat Enterprise Linux 1208RHL Red Hat Linux 1209RIB routing information base 1210RIFF Resource Interchange File Format 1211RIP Raster Image Processor 1212RIP Routing Information Protocol 1213RIR regional Internet registry 1214RISC reduced instruction set {computer,computing} 1215RKM ROM Kernel Manual 1216RLE run length encoding 1217RLL run length limited 1218RLO right-to-left override 1219RM read miss 1220RMCP Remote Management Control Protocol 1221RMI remote method invocation 1222RMO Relaxed Memory Ordering 1223RMPM rapid memory power management 1224RMS root mean square 1225RMW read, modify, write 1226RNG random number generator 1227ROM read only memory 1228RPC remote procedure call 1229RPKI resource PKI 1230RPL requested privilege level 1231RPM revolutions per minute 1232RPN reverse Polish notation 1233RPVST Rapid Per-VLAN Spanning Tree 1234RR random replacement 1235RR round robin 1236RS relay station 1237RSA Rivest, Shamir, [and] Adleman 1238RSIP Realm Specific IP 1239RSN Robust Secure Network 1240RSS really simple syndication 1241RSS residual sum of squares 1242RSTP Rapid Spanning Tree Protocol 1243RT real time 1244RTC real time clock 1245RTC real time computing 1246RTF rich text format 1247RTL register transfer language 1248RTL resistor-transistor logic 1249RTL right to left 1250RTOS real time operating system 1251RTS request to send 1252RTT round trip time 1253RUP rational unified process 1254RW Rabin-Williams 1255RWM read-write memory 1256RX {receive,receiver} 1257S/PDIF Sony/Philips Digital Interface Format 1258SA security advisory 1259SA security association 1260SA source address 1261SA structured analysis 1262SAAS software as a service 1263SACD super audio compact disc 1264SAD security association database 1265SAL {service,system} abstraction layer 1266SAM serial access memory 1267SAM sum addressed memory 1268SAML security assertion markup language 1269SAN storage area network 1270SAP service access point 1271SAPIC streamlined advanced programmable interrupt controller 1272SASD structured analysis, structured design 1273SASI Shugart Associates System Interface 1274SASL simple authentication [and] security layer 1275SATA serial advanced technology attachment 1276SAX simple API for XML 1277SB sound blaster 1278SBU standard build unit 1279SC store conditional 1280SCA source code analyzer 1281SCADA supervisory control and data acquisition 1282SCC single chip cloud 1283SCC source code control 1284SCCS Source Code Control System 1285SCI scalable coherent interface 1286SCI system control interrupt 1287SCM software configuration management 1288SCM source code management 1289SCM storage-class memory 1290SCO synchronous connection orientated 1291SCP secure copy 1292SCSI Small Computer System Interface 1293SCTP Stream Control Transmission Protocol 1294SDEI software delegated exception interface 1295SDI symbol deinterleave 1296SDK software development kit 1297SDL Simple Declarative Language 1298SDL Simple Direct-media Layer 1299SDLC {software,system,systems} development life cycle 1300SDN software defined networking 1301SDP Session Description Protocol 1302SDRAM synchronous dynamic random access memory 1303SDS software defined storage 1304SDT syntax-directed translation 1305SEA synchronous external abort 1306SEGV segmentation violation 1307SEO search engine optimization 1308SES SCSI enclosure services 1309SFC sequential function chart 1310SFI simple firmware interface 1311SFI software fault isolation 1312SFTP SSH File Transfer Protocol 1313SFTP Serial File Transfer Protocol 1314SFTP Simple File Transfer Protocol 1315SGMII serial gigabit media independent interface 1316SGRAM synchronous graphics random access memory 1317SHA secure hash algorithm 1318SIDH supersingular isogeny Diffie-Hellman 1319SIEM security information and event management 1320SIF source input format 1321SIFS short inter-frame space 1322SIM subscriber identity module 1323SIMD single instruction, multiple data 1324SIMM single inline memory module 1325SIP Session Initiation Protocol 1326SIR signal-to-interference ratio 1327SIR slow infrared 1328SISD single instruction, single data 1329SLAAC stateless address auto-configuration 1330SLC single-level cell 1331SLDRAM synchronous-link dynamic random access memory 1332SLED single large expensive disk 1333SLI scalable link interface 1334SLI scan-line interleave 1335SLIC system license internal code 1336SLOC source lines of code 1337SLRU segmented LRU 1338SMA smart memory access 1339SMAF system management action field 1340SMAP Simple Mail Access Protocol 1341SMAP supervisor mode access prevention 1342SMART self-monitoring analysis and reporting technology 1343SMB Server Message Block 1344SMB system management bus 1345SMBIOS System Management BIOS 1346SMC system management controller 1347SMD storage module device 1348SMEP supervisor mode execution protection 1349SMF single mode fiber 1350SMI structure of management information 1351SMI system management interrupt 1352SMM system management mode 1353SMP symmetric multiprocessing 1354SMT simultaneous multithreading 1355SMTP Simple Mail Transfer Protocol 1356SMU system management unit 1357SNA systems network architecture 1358SNAP Sub-Network Access Protocol 1359SNIA Storage Networking Industry Association 1360SNMP Simple Network Management Protocol 1361SNR signal-to-noise ratio 1362SOA service oriented architecture 1363SOAP Simple Object Access Protocol 1364SOC system on chip 1365SOF start of frame 1366SOH start of header 1367SOHO small office/home office 1368SOL serial over LAN 1369SOM system on module 1370SP service pack 1371SP stack pointer 1372SPA storage pool allocator 1373SPARC scalable processor architecture 1374SPARQL SPARQL Protocol and RDF Query Language 1375SPD security policy database 1376SPD serial presence detect 1377SPDIF Sony/Philips digital interface format 1378SPI serial peripheral interface 1379SPI stateful packet inspection 1380SPL system interrupt priority level 1381SPL spinlock 1382SPMD single process, multiple data 1383SPR special purpose register 1384SPT sectors per track 1385SQA software quality assurance 1386SQCIF sub quarter common intermediate format 1387SQL Structured Query Language 1388SRAM static random access memory 1389SRC sample rate conversion 1390SRP SCSI RDMA protocol 1391SS self-snoop 1392SS stack segment 1393SSA static single assignment 1394SSAP source service access point 1395SSB single-sideband modulation 1396SSD solid state drive 1397SSE streaming SIMD extensions 1398SSFDC solid state floppy disc card 1399SSH secure shell 1400SSI server side includes 1401SSID service set identifier 1402SSL secure sockets layer 1403SSP stack smashing protection 1404STC software thermal control 1405STD state transition diagram 1406STOMP Streaming Text Oriented Messaging Protocol 1407STP Spanning Tree Protocol 1408STP shielded twisted pair 1409SUN Stanford University Network 1410SUS Single Unix Specification 1411SUT system under test 1412SVG scalable vector graphics 1413SVGA Super Video Graphics Array 1414SVI {switch,switched} virtual interface 1415SVM secure virtual machine 1416SVM support vector machine 1417SVR System V Release 1418SVS Separate Virtual Space 1419SWF Shockwave Flash 1420SWIG simplified wrapper [and] interface generator 1421SYR symbol timing recovery 1422TA test assertion 1423TA transmitter address 1424TAI international atomic time 1425TAO track at once 1426TAOCP The Art of Computer Programming 1427TAP Test Anything Protocol 1428TAS test and set 1429TB terabyte 1430TCB trace capture buffer 1431TCB trusted computing base 1432TCC thermal control circuit 1433TCL tool command language 1434TCP Transmission Control Protocol 1435TCQ tagged command queueing 1436TDC time [to] digital converter 1437TDD test-driven development 1438TDD time division duplex 1439TDM time division multiplexing 1440TDMA time division multiple access 1441TDOA time difference of arrival 1442TDP thermal design {point,power} 1443TECO Text Editor and Corrector 1444TFT thin film transistor 1445TFTP Trivial File Transfer Protocol 1446TIAS try it and see 1447TIFF tagged image file format 1448TITS try it to see 1449TK temporal key 1450TKIP Temporal Key Integrity Protocol 1451TLA top level aggregator 1452TLB translation lookaside buffer 1453TLD top level domain 1454TLI transport layer interface 1455TLS thread local storage 1456TLS transport layer security 1457TM Turing machine 1458TM thermal monitor 1459TMDS transition minimized differential signaling 1460TMO timeout 1461TOD time of day 1462TOS terms of service 1463TOS trusted operating system 1464TOS type of service 1465TP transaction processing 1466TPI tracks per inch 1467TPM transactions per minute 1468TPM trusted platform module 1469TPR task priority register 1470TPS transactions per second 1471TPS transmission parameters signaling 1472TR task register 1473TR token ring 1474TRL timing recovery loop 1475TRNG true random number generator 1476TS terminal services 1477TS time series 1478TS time stamp 1479TS transport stream 1480TSAN Thread Sanitizer 1481TSC time stamp counter 1482TSD time stamp disable 1483TSDB time series database 1484TSL test, set, lock 1485TSO time sharing option 1486TSO Total Store Ordering 1487TSP Time-Stamp Protocol 1488TSP Tunnel Setup Protocol 1489TSP time synchronization protocol 1490TSP traveling salesman problem 1491TSS task state segment 1492TTL time to live 1493TTL transistor-transistor logic 1494TTM translation table maps 1495TTY teletype 1496TUI {terminal,text-based,textual} user interface 1497TX {transmit out,transmitter} 1498TXG transaction group 1499TZ time zone 1500UAC user {access,account} control 1501UAF use-after-free 1502UART universal asynchronous receiver/transmitter 1503UAT user acceptance testing 1504UB undefined behavior 1505UBSAN Undefined Behavior Sanitizer 1506UC uncacheable 1507UCS uniform-cost search 1508UDMA ultra DMA 1509UDO ultra density optical 1510UDP User Datagram Protocol 1511UEFI unified extensible firmware interface 1512UFS Unix File System 1513UGA universal graphics adapter 1514UI unit interval 1515UI user interface 1516UICC universal integrated circuit card 1517UID unique identifier 1518UID user identifier 1519UL upload 1520UMA uniform memory access 1521UMA upper memory area 1522UMB upper memory block 1523UML unified modeling language 1524UMPC ultra-mobile PC 1525UPNP universal plug and play 1526UPS uninterruptible power supply 1527URI uniform resource identifier 1528URL uniform resource locator 1529URN uniform resource name 1530USART universal synchronous/asynchronous receiver/transmitter 1531USB universal serial bus 1532USWC uncacheable speculative write combining 1533UT unit test 1534UTC coordinated universal time 1535UTP unshielded twisted pair 1536UUCP Unix-to-Unix Copy Protocol 1537UUID universally unique identifier 1538UUOC useless use of cat 1539UUT unit under test 1540UX user experience 1541VA vertical alignment 1542VA virtual address 1543VA volt-ampere 1544VAX virtual address extension 1545VB Visual Basic 1546VCA variable-gain amplifier 1547VCC common collector voltage 1548VCF voltage-controlled filter 1549VCM virtual channel memory 1550VCO voltage-controlled oscillator 1551VCS version control system 1552VESA Video Electronics Standards Association 1553VFO variable-frequency oscillator 1554VFS virtual file system 1555VG volume group 1556VGA Video Graphics Array 1557VHDCI very high density cable interconnect 1558VID {VLAN,voltage level} identifier 1559VIM Vi IMproved 1560VIPT virtually indexed, physically tagged 1561VIVT virtually indexed, virtually tagged 1562VLAN virtual local area network 1563VLIW very long instruction word 1564VLSI very large scale integration 1565VLSM variable length subnet mask 1566VM virtual {machine,memory} 1567VME virtual mode extension 1568VMX vector multimedia extensions 1569VMX virtual machine extensions 1570VOD video on demand 1571VPN virtual private network 1572VR virtual reality 1573VRAM video random access memory 1574VRF virtual routing and forwarding 1575VRM voltage regulator module 1576VRRP Virtual Router Redundancy Protocol 1577VSTP VLAN Spanning Tree Protocol 1578VTP VLAN Trunking Protocol 1579W watt 1580W3C World Wide Web Consortium 1581WAMP Web Application Messaging Protocol 1582WAN wide area network 1583WAP Wireless Application Protocol 1584WAP wireless access point 1585WDM Windows Driver Model 1586WDDM Windows Display Driver Model 1587WDT watchdog timer 1588WEP Wired Equivalent Privacy 1589WFI wait for interrupt 1590WFQ weighted fair queuing 1591WH write hit 1592WIFI wireless fidelity 1593WLAN wireless local area network 1594WM write miss 1595WMI Windows Management Instrumentation 1596WOL Wake-on-LAN 1597WOM Wake-on-Modem 1598WOR Wake-on-Ring 1599WORM write once read many 1600WP WordPerfect 1601WP word processor 1602WP write protect 1603WPA Wi-Fi Protected Access 1604WPA2 Wi-Fi Protected Access II 1605WPS Wi-Fi Protected Setup 1606WRAM window random access memory 1607WS web services 1608WTC write through caching 1609WWAN wireless wide area network 1610WWW world wide web 1611WYSIAYG what you see is all you get 1612WYSIWYG what you see is what you get 1613XBAR crossbar 1614XDMCP X Display Manager control protocol 1615XER XML encoding rules 1616XGA Extended Graphics Array 1617XHR XMLHttpRequest 1618XIP execute in place 1619XML Extensible Markup Language 1620XNA XNA's not acronymed 1621XNS Xerox network systems 1622XOR exclusive or 1623XP extreme programming 1624XSI X/Open System Interface 1625XSL extensible stylesheet language 1626XSS cross site scripting 1627XT extended technology 1628XTI X/Open transport interface 1629XUL XML user interface language 1630YACC yet another compiler compiler 1631YAML YAML ain't markup language 1632YANG yet another next generation 1633YAWPFAPR you are welcome; please file a problem report 1634YP Yellow Pages 1635YTD year to date 1636ZAP ZFS attribute processor 1637ZBR zone bit recording 1638ZFOD zero-filled on demand 1639ZFS zettabyte file system 1640ZIF zero insertion force 1641ZIFS zero insertion force socket 1642ZIL ZFS intent log 1643ZMA zone multicast address 1644ZPL ZFS Posix layer 1645ZVOL ZFS Volume 1646