acronyms.comp revision 1.239
1$NetBSD: acronyms.comp,v 1.239 2019/04/02 11:25:15 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 210CDMA code division multiple access 211CDP Cisco Discovery Protocol 212CDRAM cache dynamic random access memory 213CER canonical encoding rules 214CF compact flash 215CFB cipher feedback 216CFG context-free grammar 217CFG control-flow graph 218CFI control-flow integrity sanitizer 219CG control gate 220CGA Color Graphics Adapter 221CGI common gateway interface 222CGN Carrier-Grade NAT 223CHAP Challenge-Handshake Authentication Protocol 224CHS cylinder/head/sector 225CI continuous integration 226CI {common,component} interface 227CIDR Classless Inter-Domain Routing 228CIF common intermediate format 229CIFS Common Internet File System 230CIL common intermediate language 231CIR carrier-to-interference ratio 232CIS contact image sensor 233CISC complex instruction set {computer,computing} 234CJK Chinese, Japanese, [and] Korean 235CLF common log format 236CLI command line interface 237CLR common language runtime 238CLTT closed loop thermal throttling 239CLUT color look-up table 240CLV constant linear velocity 241CM configuration management 242CMA concert multithread architecture 243CMC chassis management controller 244CMC corrected machine check 245CMS {configuration,content,course} management system 246CMI control {management,method} interface 247CMOS complementary metal-oxide-semiconductor 248CMP chip multi-processing 249CMS content management system 250CMYK cyan magenta yellow black 251CN {common,canonical} name 252CNC computer numerical control 253CNR carrier-to-noise ratio 254COF current operating frequency 255COFDM coded orthogonal frequency division multiplexing 256COFF common object file format 257COM component object model 258COM computer on module 259COMA cache-only memory architecture 260CORBA common object request broker architecture 261COS class of service 262COW copy-on-write 263CP continuous pilot 264CPB core performance boost 265CPC central processor complex 266CPC cpu performance counters 267CPE common phase error 268CPE common platform enumeration 269CPER common platform error record 270CPG clock pulse generator 271CPI cycles per instruction 272CPL current privilege level 273CPLD complex programmable logic device 274CPP C preprocessor 275CPS characters per second 276CPT command pass through 277CPU central processing unit 278CR carriage return 279CRC cyclic redundancy check 280CRL carrier recovery loop 281CRLF carriage return line feed 282CRT cathode ray tube 283CRUD create, read, update, and delete 284CS cable select 285CS chip select 286CS code segment 287CS computer science 288CSDL {common,conceptual} schema definition language 289CSI channel state information 290CSI common system interface 291CSMA carrier sense multiple access 292CSMA/CA carrier sense multiple access with collision avoidance 293CSMA/CD carrier sense multiple access with collision detection 294CSR control [and] status registers 295CSRG Computer Systems Research Group 296CSS cascading style sheets 297CSV comma-separated values 298CTF compact c type format 299CTM close to metal 300CTR counter [mode] 301CTS clear to send 302CUA common user access 303CUT coordinated universal time 304CV control voltage 305CVE common vulnerabilities and exposures 306CVS Concurrent Versions System 307DA destination address 308DAA distributed application architecture 309DAB digital audio broadcasting 310DAC digital [to] analog converter 311DAC discretionary access control 312DAD duplicate address detection 313DANE DNS-based Authentication of Named Entities 314DAO disk at once 315DAP Directory Access Protocol 316DAT digital audio tape 317DAT dynamic acceleration technology 318DB database 319DBA database administrator 320DBA dynamic bandwidth allocation 321DBB data bus buffer 322DBC design by contract 323DBL dynamic buffer limiting 324DBMS database management system 325DBS database server 326DC direct current 327DCC Direct Client-to-Client 328DCC direct cable connect 329DCD data carrier detect 330DCE data control equipment 331DCE distributed computing environment 332DCIM data center infrastructure management 333DCIM digital camera images 334DCL Digital Command Language 335DCOM distributed component object model 336DCOP Desktop COmmunication Protocol 337DCS data collection systems 338DCT discrete cosine transform 339DCU data cache unit 340DDC display data channel 341DDE dynamic data exchange 342DDK device driver kit 343DDL data description language 344DDR double data rate 345DDS direct digital sound 346DDWG Digital Display Working Group 347DE debugging extensions 348DE desktop environment 349DEA data encryption algorithm 350DEC Digital Equipment Corporation 351DEK data encryption key 352DEP data execution prevention 353DER distinguished encoding rules 354DES Data Encryption Standard 355DF don't fragment 356DFA deterministic finite automaton 357DFC data flow control 358DFS depth first search 359DFS distributed file system 360DFSAN Data Flow Sanitizer 361DFT diagnostic function test 362DFT discrete Fourier transform 363DGL data generation language 364DH Diffie-Hellman 365DHCP Dynamic Host Configuration Protocol 366DIFS distributed inter-frame space 367DIMM dual inline memory module 368DIRT design in real time 369DL diode logic 370DL discrete logarithm 371DL download 372DLE data link escape 373DLL dynamic link library 374DLP discrete logarithm problem 375DMA direct memory access 376DMI desktop management interface 377DMS document management system 378DMT discrete multitone modulation 379DMU data management layer 380DNARD Digital network appliance reference design 381DND drag and drop 382DNLC directory name lookup cache 383DNS Domain Name System 384DNSSEC DNS Security Extensions 385DOE distributed object environment 386DOF data over fibre 387DOM document object model 388DOS denial of service 389DOS disk operating system 390DP DisplayPort 391DPC deferred procedure call 392DPCM differential pulse code modulation 393DPD dead peer detection 394DPI deep packet inspection 395DPI dots per inch 396DPL descriptor privilege level 397DPS Display PostScript 398DPST display power savings technology 399DRAAS disaster recovery as a service 400DRAM dynamic random access memory 401DRBG deterministic random bit generator 402DRI direct rendering infrastructure 403DRM digital rights management 404DRRS display refresh rate switching 405DS debug store 406DSA digital signature algorithm 407DSAP destination service access point 408DSB double-sideband modulation 409DSDT differentiated system descriptor table 410DSL dataset and snapshot layer 411DSL digital subscriber line 412DSL domain specific language 413DSLAM digital subscriber line access multiplexer 414DSN delivery status notification 415DSO dynamic shared object 416DSP digital signal processor 417DSSS direct sequence spread spectrum 418DTD document type definition 419DTE data terminal equipment 420DTE dumb terminal emulator 421DTL diode-transistor logic 422DTLS datagram transport layer security 423DTS digital thermal sensor 424DUT device under test 425DVB digital video broadcasting 426DVCS distributed version control system 427DVD digital versatile disc 428DVFS dynamic voltage and frequency scaling 429DVI device independent 430DVI Digital Visual Interface 431DVR digital video recorder 432E-XER extended XML encoding rules 433EABI embedded-application binary interface 434EAI Email Address Internationalization 435EAI Enterprise Application Integration 436EAP Extensible Authentication Protocol 437EAPOL EAP over Lan 438EBCDIC Extended Binary Coded Decimal Interchange Code 439EBDA Extended BIOS Data Area 440EBNF extended backus-naur form 441EBR extended boot record 442EC elliptic curve 443ECC elliptic curve cryptography 444ECC error correction code 445ECDH elliptic curve Diffie-Hellman 446ECDL elliptic curve discrete logarithm 447ECDLP elliptic curve discrete logarithm problem 448ECDSA elliptic curve digital signature algorithm 449ECL emitter-coupled logic 450ECN explicit congestion notification 451ECP enhanced capability port 452ECS enhanced chip set 453ECS extended configuration space 454EDAC error detection and correction 455EDAT enhanced dynamic acceleration technology 456EdDSA Edwards curve digital signature algorithm 457EDGE explicit data graph execution 458EDID extended display identification data 459EDO extended data out 460EDS electronical data sheet 461EEE energy efficient ethernet 462EEPROM electrically erasable programmable read only memory 463EFI extensible firmware interface 464EFL emitter follower logic 465EFM eight to fourteen modulation 466EGA Enhanced Graphics Adapter 467EGP exterior gateway protocol 468EH extension header 469EIDE enhanced IDE 470EISA extended industry standard architecture 471EINJ error injection table 472ELF executable and linking format 473ELS entry level system 474EMI electro-magnetic interference 475EMP electro-magnetic pulse 476EMR electro-magnetic radiation 477EMACS Editor MACroS 478EOF end of file 479EOI end of interrupt 480EOIS end of interactive support 481EOL end of life 482EOL end of line 483EOT end of transmission 484EPIC explicitly parallel instruction computing 485EPP enhanced parallel port 486EPRML extended partial response, maximum likelihood 487EPROM erasable programmable read only memory 488ERD emergency recovery disk 489ERD entity relationship diagram 490ERE extended regular expression 491ERST error record serialization table 492ESAN Efficiency Sanitizer 493ESB enterprise service bus 494ESDI enhanced small disk interface 495ESDRAM enhanced synchronous dynamic random access memory 496ESI enclosure services interface 497ESS electronic switching system 498ESS extended service set 499ESSID extended service set identifier 500EST enhanced speedstep 501ETL extract, transform, load 502EU execution unit 503EULA end user license agreement 504FAT file allocation table 505FBRAM frame buffer random access memory 506FCIF full common intermediate format 507FCL fiber channel loop 508FCS frame check sequence 509FDC floppy disk controller 510FDD floppy disk drive 511FDDI fiber distributed data interface 512FDE full disk encryption 513FDT flattened device tree 514FEA finite element analysis 515FEC forward error correction 516FET field-effect transistor 517FF finite field 518FF form feed 519FFDH finite-field Diffie-Hellman 520FFH functional fixed hardware 521FFI foreign function interface 522FFM focus follows mouse 523FFS Fast File System 524FFS find first set 525FFT fast Fourier transform 526FG floating gate 527FHSS frequency hop spread spectrum 528FID frequency identifier 529FIFO first in, first out 530FILO first in, last out 531FIPS Federal Information Processing Standards 532FIR fast infrared 533FLOPS floating [point] operations per second 534FLOSS free/libre/open source software 535FM frequency modulation 536FMR false match rate 537FOSS free/open source software 538FPGA field programmable gate array 539FPM fast page mode 540FPR floating point register 541FPU floating point unit 542FQDN fully qualified domain name 543FRR false rejection rate 544FRU field replaceable unit 545FS file system 546FSB front side bus 547FSCK file system check 548FSF Free Software Foundation 549FSK frequency shift keying 550FSM finite-state machine 551FTA fault tree analysis 552FTL flash translation layer 553FTP File Transfer Protocol 554FTPS File Transfer Protocol Secure 555FUS fast user switching 556FWH firmware hub 557FWS folding white space 558GAL generic array logic 559GAS generic address structure 560GC garbage collector 561GCM Galois counter mode 562GCR group-coded recording 563GDI Graphics Device Interface 564GDT global descriptor table 565GEM graphics environment manager 566GEM graphics execution manager 567GENA general event notification architecture 568GHC Glasgow Haskell compiler 569GHES generic hardware error source 570GIC generic interrupt controller 571GID group identifier 572GIF graphics interchange format 573GMCH graphics and memory controller hub 574GNU GNU's Not Unix 575GOP graphics output protocol 576GOT global offset table 577GPE general purpose event 578GPF general protection fault 579GPG GNU Privacy Guard 580GPL [GNU] General Public License 581GPR general purpose register 582GPS generalized processor sharing 583GPT GUID partition table 584GPU graphics processing unit 585GR golden ratio 586GRE generic routing encapsulation 587GSI global system interrupt 588GUI graphical user interface 589GUID globally unique identifier 590GVFS git virtual file system 591HA high availability 592HAL hardware abstraction layer 593HAT hashed array tree 594HATEOAS hypermedia as the engine of application state 595HBA host bus adapter 596HCF halt and catch fire 597HCI host controller interface 598HCI human-computer interaction 599HCL hardware compatibility list 600HDCP High-bandwidth Digital Content Protection 601HDD hard disk drive 602HDL hardware description language 603HDMI High-Definition Multimedia Interface 604HDTV high-definition television 605HECI host embedded controller interface 606HEST hardware error source table 607HF high frequency 608HFM highest frequency mode 609HID human interface device 610HKP HTTP Keyserver Protocol 611HLL high-level language 612HMA high memory area 613HMI human-machine interface 614HOOD hierarchical object oriented design 615HP Hewlett-Packard 616HPC high performance computing 617HPET high precision event timer 618HSM hardware security module 619HSM hierarchical storage management 620HT hyper-threading 621HTC hardware thermal control 622HTCC high temperature co-fired ceramic 623HTML HyperText Markup Language 624HTT hyper-threading technology 625HTTP Hypertext Transfer Protocol 626HTTPS Hypertext Transfer Protocol Secure 627HVM hardware virtual machine 628HVDS High-Voltage Differential Signaling 629HWASAN Hardware-assisted Address Sanitizer 630HZ Hertz 631I2O intelligent input/output 632IA information assurance 633IAAS infrastructure as a service 634IANA Internet Assigned Numbers Authority 635IBC iterated block cipher 636IBM International Business Machines 637IBS instruction based sampling 638IBSS independent basic service set 639IC integrated circuit 640ICA independent computer architecture 641ICB Internet Citizen's Band 642ICE in-circuit emulator 643ICE internal compiler error 644ICH I/O controller hub 645ICMP Internet Control Message Protocol 646ICT information and communications technology 647ICW initialization command word 648IDA Intel dynamic acceleration 649IDCMP Intuition direct communication message port 650IDE integrated development environment 651IDE integrated drive electronics 652IDPS intrusion detection [and] prevention system 653IDRP inter-domain routing protocol 654IDS intrusion detection system 655IDT interrupt descriptor table 656IE Internet Explorer 657IEC International Electrotechnical Commission 658IEEE Institute of Electrical and Electronics Engineers 659IESG Internet Engineering Steering Group 660IETF Internet Engineering Task Force 661IF intermediate frequency 662IFCM isochronous flow control mode 663IFF Interchange File Format 664IFS internal field separator 665IGD Internet gateway device 666IGMP Internet Group Management Protocol 667IGP interior gateway protocol 668IHV independent hardware vendor 669IKE Internet key exchange 670ILM internal loopback mode 671ILOM integrated lights-out management 672ILP instruction level parallelism 673IM instant messaging 674IMAP Internet Message Access Protocol 675IMC integrated memory controller 676IMCR interrupt mode configuration register 677IMR interrupt mask register 678IMS information management system 679IMSI international mobile subscriber identity 680INCITS InterNational Committee for Information Technology Standards 681IO input/output 682IOCTL input/output control 683IOM input/output managers 684IOMMU input/output memory management unit 685IOT Internet of Things 686IP Internet Protocol 687IP intellectual property 688IPC instructions per cycle 689IPC interprocess communication 690IPCF interprocess communication facility 691IPE integrated programming environment 692IPI intelligent peripheral interface 693IPI interprocessor interrupt 694IPL Initial Program Load 695IPL Interrupt Priority Level 696IPMB Intelligent Platform Management Bus 697IPMI Intelligent Platform Management Interface 698IPNG Internet Protocol, Next Generation 699IPS in-plane switching 700IPS intrusion prevention system 701IPSEC Internet Protocol Security 702IRC Internet Relay Chat 703IRDA infrared data association 704IRQ interrupt request 705IRQL interrupt request level 706IRR interrupt request register 707IRTF Internet Research Task Force 708IS information system 709ISA industry standard architecture 710ISA instruction set architecture 711ISDN integrated services digital network 712ISI inter-symbol interference 713ISM industrial, scientific, [and] medical 714ISN initial serial number 715ISO International Standards Organization 716ISOC Internet Society 717ISP Internet service provider 718ISR in-service register 719ISR interrupt service routine 720IST interrupt stack table 721ISV independent software vendor 722IT information technology 723ITB Intel Turbo Boost 724ITIL information technology infrastructure library 725ITP in-target probe 726ITSM IT service management 727IV initialization vector 728IVT interrupt vector table 729JBOD just a bunch of disks 730JCL Job Control Language 731JFET junction [gate] field-effect transistor 732JIT just in time 733JPEG Joint Photographic Experts Group 734JRE Java Runtime Environment 735JSON JavaScript Object Notation 736JTAG joint test action group 737KASLR kernel address space layout randomization 738KB keyboard 739KB kilobyte 740KBD keyboard 741KBD kilobaud 742KCS keyboard controller style 743KLOC thousand lines of code 744KMS kernel-mode setting 745KPI kernel programming interface 746KVA kernel virtual address 747KVM kernel virtual machine 748KVM kernel virtual memory 749KVM keyboard, video, [and] mouse 750LAMP Linux Apache MySQL {Perl,PHP,Python} 751LAN local area network 752LAPIC local advanced programmable interrupt controller 753LAR load access rights 754LBA logical block addressing 755LBS location-based service 756LCD liquid crystal display 757LCP link control protocol 758LDA local delivery agent 759LDAP Lightweight Directory Access Protocol 760LDR light-dependent resistor 761LDT local descriptor table 762LE logical extent 763LED light emitting diode 764LELL low energy link layer 765LER label edge router 766LF line feed 767LF low frequency 768LFM lowest frequency mode 769LFN long file names 770LFO low-frequency oscillation 771LFS log-structured file system 772LFU least frequently used 773LHP loop heat pipe 774LIFO last in, first out 775LILO LInux LOader 776LILO last in, last out 777LINT local interrupt 778LIR local Internet registry 779LISP LISt Processor 780LISP Locator/ID Separation Protocol 781LKM {Linux,loadable} kernel module 782LKML Linux kernel mailing list 783LL load linked 784LL/SC load linked/store conditional 785LLC logical link control 786LLDP link layer discovery protocol 787LLF low level format 788LLMNR link-local multicast name resolution 789LLVM Low Level Virtual Machine 790LM long mode 791LMM link management mode 792LMP link management protocol 793LNO loop nest optimization 794LOC lines of code 795LOM lights-out management 796LPE Linux performance events 797LPC low pin count 798LPS local positioning system 799LRC longitudinal redundancy check 800LRM left-to-right mark 801LRO left-to-right override 802LRU least recently used 803LSAN Leak Sanitizer 804LSB Linux standards base 805LSB least significant {bit,byte} 806LSI large scale integration 807LSL load segment limit 808LSM log structured merge 809LSN Large Scale NAT 810LSN log sequence number 811LSR label switch router 812LTCC low temperature co-fired ceramic 813LTO linear tape-open 814LTO link time optimization 815LTR left to right 816LTR load task register 817LTR letter(-sized paper) 818LTS long term support 819LUA Lua Uppercase Accident 820LUN logical unit number 821LV logical volume 822LVM logical volume management 823LVT local vector table 824LVDS Low-Voltage Differential Signaling 825LWP light-weight process 826LZW Lempel Ziv Welch 827MAC mandatory access control 828MAC {media,medium} access control 829MAC message authentication {check,code} 830MADT multiple APIC descriptor table 831MB megabyte 832MBA multi-boot agent 833MBR master boot record 834MBS megabits per second 835MC memory controller 836MCA machine check architecture 837MCA MicroChannel architecture 838MCC multiversion concurrency control 839MCE machine check exception 840MCGA Multi-Color Graphics Array 841MCH memory controller hub 842MCM multi-chip module 843MCQ memory controlled queue 844MD machine-dependent 845MD-SAL model-driven service abstraction layer 846MDA mail delivery agent 847MDA Monochrome Display Adapter 848MDC Management Data Clock 849MDI Medium Dependent Interface 850MDI-X Medium Dependent Interface Crossover 851MDIO Management Data Input/Output 852MDMX MIPS Digital Media eXtension 853MDRAM multibank dynamic random access memory 854MESI modified, exclusive, shared, invalid 855MFC merge from current 856MFC Microsoft Foundation Classes 857MFM modified frequency modulation 858MFU most frequently used 859MI machine-independent 860MI machine interface 861MIB management information base 862MIC message integrity {check,code} 863MID mobile Internet device 864MIDI musical instrument digital interface 865MIF management information format 866MII media independent interface 867MIM man in the middle 868MIMD multiple instruction, multiple data 869MIME Multipurpose Internet Mail Extensions 870MIMO multiple input multiple output 871MIPS million instructions per second 872MIPS Microprocessor without Interlocked Pipeline Stages 873MISD multiple instruction, single data 874MIT Massachusetts Institute of Technology 875MITM man in the middle 876ML machine language 877ML machine learning 878ML mailing list 879ML markup language 880ML maximum likelihood 881MLC multi-level cell 882MLD multicast listener discovery 883MLHP micro loop heat pipe 884MMF multi-mode fiber 885MMIC monolithic microwave integrated circuit 886MMIO memory mapped input/output 887MMORPG massive multiplayer online role playing game 888MMU memory management unit 889MMX matrix math extension 890MMX multimedia extension 891MMX multiple math extension 892MO magneto-optical 893MOESI modified, owned, exclusive, shared, invalid 894MOF maximum operating frequency 895MOSFET metal-oxide-semiconductor field-effect transistor 896MOSI modified, owned, shared, invalid 897MP multi-platform 898MP multiplayer 899MP {multiprocessing,multiprocessor} 900MPEG moving picture experts group 901MPI message passing interface 902MPLS Multiprotocol Label Switching 903MPP massively parallel processor 904MPS memory pool system 905MPS multiprocessor specification 906MQTT Message Queuing Telemetry Transport 907MR modem ready 908MRU most recently used 909MS Microsoft 910MSAN Memory Sanitizer 911MSB most significant {bit,byte} 912MSC message sequence chart 913MSE mean square error 914MSF minutes seconds frames 915MSI message signaled interrupt 916MSI modified, shared, invalid 917MSR {machine state,model-specific} register 918MSS maximum segment size 919MSTP Multiple Spanning Tree Protocol 920MT machine translation 921MTA mail transfer agent 922MTBF mean time between failures 923MTP media transfer protocol 924MTRR memory type range register 925MTTF mean time to failure 926MTU maximum transmission unit 927MUA mail user agent 928MUD multi-user domain 929MVCC multiversion concurrency control 930MWE module width encoding 931MX mail exchange 932NACK negative acknowledgement 933NAK negative acknowledgement 934NAN not a number 935NAPT Network Address Port Translation 936NAS network attached storage 937NAT network address translation 938NAV network allocation vector 939NC numerical control 940NCO numerically-controlled oscillator 941NCP Network Control Protocol 942NCQ native command queuing 943ND neighbor discovery 944NDFA nondeterministic finite automaton 945NE numeric error 946NEWS Network extensible Window System 947NFA nondeterministic finite automaton 948NFC near-field communication 949NFCI no functional change intended 950NFS network file system 951NFV network function virtualization 952NIA next instruction address 953NIC network information center 954NIC network interface card 955NIDS network intrusion detection system 956NIP network interface protocol 957NIPS network intrusion prevention system 958NIS network information service 959NIST National Institute of Standards and Technology 960NLS native language support 961NMI non-maskable interrupt 962NNTP Network News Transfer Protocol 963NOC network operations center 964NOP no operation 965NOS network operating system 966NP nondeterministic polynomial time 967NRND not recommended for new designs 968NRZ non-return to zero 969NSA nation-state adversary 970NSA no such agency 971NSA National Security Agency 972NTM non-deterministic Turing machine 973NTP Network Time Protocol 974NUMA non-uniform memory access 975NVRAM non-volatile random access memory 976NW not write-through 977NX no execute 978OAEP optimal asymmetric encryption padding 979OAM operations, administration, and {management,maintenance} 980OBO off by one 981OBOE off by one error 982OCL object constraint language 983OCR optical character recognition 984ODCM on-demand clock modulation 985ODT on-die termination 986OEM original equipment manufacturer 987OFB output feedback 988OFDM orthogonal frequency division multiplexing 989OFET organic field-effect transistor 990OLAP online analytical processing 991OLE object linking and embedding 992OLTP online transaction processing 993ONFI open nand flash interface 994OO OpenOffice 995OO object oriented 996OOB out of band 997OOE out of order execution 998OOM out of memory 999OOO OpenOffice.org 1000OOP object oriented programming 1001OOPS object oriented programming systems 1002OOSE object oriented software engineering 1003OPM operations per minute 1004OPS operations per second 1005OQL Object Query Language 1006ORB object request broker 1007ORM object-relational mapping 1008OS operating system 1009OSD open source definition 1010OSF open software foundation 1011OSI Open Source Initiative 1012OSI open systems interconnection 1013OSPF open shortest path first 1014OSPM OS power management 1015OSS open sound system 1016OSS open source software 1017OSVW operating system visible workarounds 1018OTP one time password 1019OTP open telecom platform 1020OU organizational unit 1021OUI organizationally unique identifier 1022OWL Web Ontology Language 1023P2P PCI to PCI 1024P2P peer to peer 1025PA phase accumulator 1026PA physical address 1027PAAS platform as a service 1028PAC phase-amplitude converter 1029PAE physical address extension 1030PAL phase alternating line 1031PAL programmable array logic 1032PAM pluggable authentication modules 1033PAM pulse amplitude modulation 1034PAP password authentication protocol 1035PAT page attribute table 1036PAT port address translation 1037PATA parallel ATA 1038PAX portable archive exchange 1039PBE pending break encoding 1040PBE programming by example 1041PC personal computer 1042PC program counter 1043PCB printed circuit board 1044PCB process control block 1045PCB Protocol Control Block 1046PCC Portable C Compiler 1047PCD page-level cache disable 1048PCE path computation element 1049PCE performance-monitor counter enable 1050PCEP Path Computation Element Protocol 1051PCH platform controller hub 1052PCI peripheral component interconnect 1053PCM phase change memory 1054PCM pulse code modulation 1055PCMCIA Personal Computer Memory Card International Association 1056PCP Port Control Protocol 1057PD public domain 1058PDA personal digital assistant 1059PDA pushdown automaton 1060PDAG propositional directed acyclic graph 1061PDB power distribution board 1062PDF portable document format 1063PDM pulse-duration modulation 1064PDN pull-down network 1065PDP page {descriptor,directory} page 1066PDS product data sheet 1067PDU protocol data unit 1068PE protection enable 1069PEAP Protected EAP 1070PECI platform environment control interface 1071PEP protocol extension protocol 1072PER packed encoding rules 1073PFS perfect forward secrecy 1074PGAS partitioned global address space 1075PGE page global enable 1076PGP Pretty Good Privacy 1077PHB PCI host bridge 1078PHP PHP: Hypertext Preprocessor 1079PIC performance instrumentation counters 1080PIC position independent code 1081PIC programmable interrupt controller 1082PICNIC problem in chair, not in computer 1083PID process id 1084PIE position independent executable 1085PIL Priority Interrupt Level 1086PIM personal information manager 1087PIM platform-independent model 1088PIO programmed input/output 1089PIPT physically indexed, physically tagged 1090PIQ prefetch input queue 1091PIT programmable interrupt timer 1092PIV personal identity verification 1093PIX Private Internet eXchange 1094PKCS public-key cryptography standards 1095PKI public key infrastructure 1096PLC programmable logic controller 1097PLD programmable logic device 1098PLL phase locked loop 1099PLRU pseudo LRU 1100PLTM package level thermal management 1101PM power management 1102PM {phase,pulse} modulation 1103PMC performance monitoring counters 1104PME power management event 1105PMEG page map entry group 1106PMI performance monitoring infrastructure 1107PMI platform management interrupt 1108PMIC power management integrated circut 1109PMIO port-mapped input/output 1110PMT photo-multiplier tube 1111PMU performance monitoring units 1112PMU power management unit 1113PNG portable network graphics 1114PNP plug and play 1115POE power over ethernet 1116POF probability of failure 1117POP Post Office Protocol 1118POP power on password 1119POSIX Portable Operating System Interface [for Unix] 1120POST power on self test 1121POTS plain old telephone system 1122POWER Performance Optimization With Enhanced RISC 1123POWERPC Performance Optimization With Enhanced RISC - Performance Computing 1124PP pair programming 1125PPB PCI [to] PCI bridge 1126PPC PowerPC 1127PPC Power Performance Computing 1128PPI pixels per inch 1129PPM pages per minute 1130PPP Point-to-Point Protocol 1131PPPOA Point-to-Point Protocol over ATM 1132PPPOE Point-to-Point Protocol over Ethernet 1133PPU physics processing unit 1134PRAM Parameter RAM 1135PRBS pseudorandom bit sequence 1136PRG pseudorandom generator 1137PRF pseudorandom function [family] 1138PRML partial response, maximum likelihood 1139PRN pseudorandom {noise,number} 1140PRNG pseudorandom number generator 1141PROM programmable read only memory 1142PRP pseudorandom permutation 1143PRU Programmable Realtime Unit 1144PS PostScript 1145PSD power spectral density 1146PSE page size extensions 1147PSK phase shift keying 1148PSK pre-shared key 1149PSTN public switched telephone network 1150PSW program status word 1151PTE page table entry 1152PTLA pseudo top level aggregator 1153PTP page table page 1154PTV perceived target value 1155PU processing unit 1156PUC personal unblocking code 1157PUN physical unit number 1158PV physical volume 1159PVG physical volume group 1160PVI protected-mode virtual interrupt 1161PVST Per-VLAN Spanning Tree 1162PWM pulse width modulation 1163PXE preboot execution environment 1164QA quality assurance 1165QAM quadrature amplitude modulation 1166QAM quality assurance management 1167QBE query by example 1168QC quality control 1169QDI quasi delay insensitive 1170QCIF quarter common intermediate format 1171QOS quality of service 1172QVL qualified vendor list 1173R/O read only 1174R/W read/write 1175RA receiver address 1176RA remote assistance 1177RA resource affinity 1178RA router advertisement 1179RAD rapid application development 1180RAID redundant array of {independent,inexpensive} disks 1181RAM random access memory 1182RAS reliability, availability and serviceability 1183RAS remote access service 1184RAS restartable atomic sequence 1185RAS row address strobe 1186RBF radial basis function 1187RBT red-black tree 1188RC release candidate 1189RC remote control 1190RC run commands 1191RCS Revision Control System 1192RCS revision control system 1193RCU read, copy, update 1194RDB Rigid Disk Block 1195RDBMS relational database management system 1196RDF Resource Description Framework 1197RDM relational data model 1198RDMA remote direct memory access 1199RDRAM Rambus DRAM 1200RE regular expression 1201REST representational state transfer 1202RF radio frequency 1203RFI radio frequency interference 1204RFO request for ownership 1205RGB red green blue 1206RGBA red green blue alpha 1207RGMII reduced gigabit media independent interface 1208RH read hit 1209RHEL Red Hat Enterprise Linux 1210RHL Red Hat Linux 1211RIB routing information base 1212RIFF Resource Interchange File Format 1213RIP Raster Image Processor 1214RIP Routing Information Protocol 1215RIR regional Internet registry 1216RISC reduced instruction set {computer,computing} 1217RKM ROM Kernel Manual 1218RLE run length encoding 1219RLL run length limited 1220RLO right-to-left override 1221RM read miss 1222RMCP Remote Management Control Protocol 1223RMI remote method invocation 1224RMO Relaxed Memory Ordering 1225RMPM rapid memory power management 1226RMS root mean square 1227RMW read, modify, write 1228RNG random number generator 1229ROM read only memory 1230RPC remote procedure call 1231RPKI resource PKI 1232RPL requested privilege level 1233RPM revolutions per minute 1234RPN reverse Polish notation 1235RPVST Rapid Per-VLAN Spanning Tree 1236RR random replacement 1237RR round robin 1238RS relay station 1239RSA Rivest, Shamir, [and] Adleman 1240RSIP Realm Specific IP 1241RSN Robust Secure Network 1242RSS really simple syndication 1243RSS residual sum of squares 1244RSTP Rapid Spanning Tree Protocol 1245RT real time 1246RTC real time clock 1247RTC real time computing 1248RTF rich text format 1249RTL register transfer language 1250RTL resistor-transistor logic 1251RTL right to left 1252RTOS real time operating system 1253RTS request to send 1254RTT round trip time 1255RUP rational unified process 1256RW Rabin-Williams 1257RWM read-write memory 1258RX {receive,receiver} 1259S/PDIF Sony/Philips Digital Interface Format 1260SA security advisory 1261SA security association 1262SA source address 1263SA structured analysis 1264SAAS software as a service 1265SACD super audio compact disc 1266SAD security association database 1267SAL {service,system} abstraction layer 1268SAM serial access memory 1269SAM sum addressed memory 1270SAML security assertion markup language 1271SAN storage area network 1272SAP service access point 1273SAPIC streamlined advanced programmable interrupt controller 1274SASD structured analysis, structured design 1275SASI Shugart Associates System Interface 1276SASL simple authentication [and] security layer 1277SATA serial advanced technology attachment 1278SAX simple API for XML 1279SB sound blaster 1280SBU standard build unit 1281SC store conditional 1282SCA source code analyzer 1283SCADA supervisory control and data acquisition 1284SCC single chip cloud 1285SCC source code control 1286SCCS Source Code Control System 1287SCI scalable coherent interface 1288SCI system control interrupt 1289SCM software configuration management 1290SCM source code management 1291SCM storage-class memory 1292SCO synchronous connection orientated 1293SCP secure copy 1294SCSI Small Computer System Interface 1295SCTP Stream Control Transmission Protocol 1296SDEI software delegated exception interface 1297SDI symbol deinterleave 1298SDK software development kit 1299SDL Simple Declarative Language 1300SDL Simple Direct-media Layer 1301SDLC {software,system,systems} development life cycle 1302SDN software defined networking 1303SDP Session Description Protocol 1304SDRAM synchronous dynamic random access memory 1305SDS software defined storage 1306SDT syntax-directed translation 1307SEA synchronous external abort 1308SEGV segmentation violation 1309SEO search engine optimization 1310SES SCSI enclosure services 1311SFC sequential function chart 1312SFI simple firmware interface 1313SFI software fault isolation 1314SFTP SSH File Transfer Protocol 1315SFTP Serial File Transfer Protocol 1316SFTP Simple File Transfer Protocol 1317SGMII serial gigabit media independent interface 1318SGRAM synchronous graphics random access memory 1319SHA secure hash algorithm 1320SIDH supersingular isogeny Diffie-Hellman 1321SIEM security information and event management 1322SIF source input format 1323SIFS short inter-frame space 1324SIM subscriber identity module 1325SIMD single instruction, multiple data 1326SIMM single inline memory module 1327SIP Session Initiation Protocol 1328SIR signal-to-interference ratio 1329SIR slow infrared 1330SISD single instruction, single data 1331SLAAC stateless address auto-configuration 1332SLC single-level cell 1333SLDRAM synchronous-link dynamic random access memory 1334SLED single large expensive disk 1335SLI scalable link interface 1336SLI scan-line interleave 1337SLIC system license internal code 1338SLOC source lines of code 1339SLRU segmented LRU 1340SMA smart memory access 1341SMAF system management action field 1342SMAP Simple Mail Access Protocol 1343SMAP supervisor mode access prevention 1344SMART self-monitoring analysis and reporting technology 1345SMB Server Message Block 1346SMB system management bus 1347SMBIOS System Management BIOS 1348SMC system management controller 1349SMD storage module device 1350SMEP supervisor mode execution protection 1351SMF single mode fiber 1352SMI structure of management information 1353SMI system management interrupt 1354SMM system management mode 1355SMP symmetric multiprocessing 1356SMT simultaneous multithreading 1357SMTP Simple Mail Transfer Protocol 1358SMU system management unit 1359SNA systems network architecture 1360SNAP Sub-Network Access Protocol 1361SNIA Storage Networking Industry Association 1362SNMP Simple Network Management Protocol 1363SNR signal-to-noise ratio 1364SOA service oriented architecture 1365SOAP Simple Object Access Protocol 1366SOC system on chip 1367SOF start of frame 1368SOH start of header 1369SOHO small office/home office 1370SOL serial over LAN 1371SOM system on module 1372SP service pack 1373SP stack pointer 1374SPA storage pool allocator 1375SPARC scalable processor architecture 1376SPARQL SPARQL Protocol and RDF Query Language 1377SPD security policy database 1378SPD serial presence detect 1379SPDIF Sony/Philips digital interface format 1380SPI serial peripheral interface 1381SPI stateful packet inspection 1382SPL system interrupt priority level 1383SPL spinlock 1384SPMD single process, multiple data 1385SPR special purpose register 1386SPT sectors per track 1387SQA software quality assurance 1388SQCIF sub quarter common intermediate format 1389SQL Structured Query Language 1390SRAM static random access memory 1391SRC sample rate conversion 1392SRP SCSI RDMA protocol 1393SS self-snoop 1394SS stack segment 1395SSA static single assignment 1396SSAP source service access point 1397SSB single-sideband modulation 1398SSD solid state drive 1399SSE streaming SIMD extensions 1400SSFDC solid state floppy disc card 1401SSH secure shell 1402SSI server side includes 1403SSID service set identifier 1404SSL secure sockets layer 1405SSP stack smashing protection 1406STC software thermal control 1407STD state transition diagram 1408STOMP Streaming Text Oriented Messaging Protocol 1409STP Spanning Tree Protocol 1410STP shielded twisted pair 1411SUN Stanford University Network 1412SUS Single Unix Specification 1413SUT system under test 1414SVG scalable vector graphics 1415SVGA Super Video Graphics Array 1416SVI {switch,switched} virtual interface 1417SVM secure virtual machine 1418SVM support vector machine 1419SVR System V Release 1420SVS Separate Virtual Space 1421SWF Shockwave Flash 1422SWIG simplified wrapper [and] interface generator 1423SYR symbol timing recovery 1424TA test assertion 1425TA transmitter address 1426TAI international atomic time 1427TAO track at once 1428TAOCP The Art of Computer Programming 1429TAP Test Anything Protocol 1430TAS test and set 1431TB terabyte 1432TCB trace capture buffer 1433TCB trusted computing base 1434TCC thermal control circuit 1435TCL tool command language 1436TCP Transmission Control Protocol 1437TCQ tagged command queueing 1438TDC time [to] digital converter 1439TDD test-driven development 1440TDD time division duplex 1441TDM time division multiplexing 1442TDMA time division multiple access 1443TDOA time difference of arrival 1444TDP thermal design {point,power} 1445TECO Text Editor and Corrector 1446TFT thin film transistor 1447TFTP Trivial File Transfer Protocol 1448TIAS try it and see 1449TIFF tagged image file format 1450TITS try it to see 1451TK temporal key 1452TKIP Temporal Key Integrity Protocol 1453TLA top level aggregator 1454TLB translation lookaside buffer 1455TLD top level domain 1456TLI transport layer interface 1457TLS thread local storage 1458TLS transport layer security 1459TM Turing machine 1460TM thermal monitor 1461TMDS transition minimized differential signaling 1462TMO timeout 1463TOD time of day 1464TOS terms of service 1465TOS trusted operating system 1466TOS type of service 1467TP transaction processing 1468TPI tracks per inch 1469TPM transactions per minute 1470TPM trusted platform module 1471TPR task priority register 1472TPS transactions per second 1473TPS transmission parameters signaling 1474TR task register 1475TR token ring 1476TRL timing recovery loop 1477TRNG true random number generator 1478TS terminal services 1479TS time series 1480TS time stamp 1481TS transport stream 1482TSAN Thread Sanitizer 1483TSC time stamp counter 1484TSD time stamp disable 1485TSDB time series database 1486TSL test, set, lock 1487TSO time sharing option 1488TSO Total Store Ordering 1489TSP Time-Stamp Protocol 1490TSP Tunnel Setup Protocol 1491TSP time synchronization protocol 1492TSP traveling salesman problem 1493TSS task state segment 1494TTL time to live 1495TTL transistor-transistor logic 1496TTM translation table maps 1497TTY teletype 1498TUI {terminal,text-based,textual} user interface 1499TX {transmit out,transmitter} 1500TXG transaction group 1501TZ time zone 1502UAC user {access,account} control 1503UAF use-after-free 1504UART universal asynchronous receiver/transmitter 1505UAT user acceptance testing 1506UB undefined behavior 1507UBSAN Undefined Behavior Sanitizer 1508UC uncacheable 1509UCS uniform-cost search 1510UDMA ultra DMA 1511UDO ultra density optical 1512UDP User Datagram Protocol 1513UEFI unified extensible firmware interface 1514UFS Unix File System 1515UGA universal graphics adapter 1516UI unit interval 1517UI user interface 1518UICC universal integrated circuit card 1519UID unique identifier 1520UID user identifier 1521UL upload 1522UMA uniform memory access 1523UMA upper memory area 1524UMB upper memory block 1525UML unified modeling language 1526UMPC ultra-mobile PC 1527UPNP universal plug and play 1528UPS uninterruptible power supply 1529URI uniform resource identifier 1530URL uniform resource locator 1531URN uniform resource name 1532USART universal synchronous/asynchronous receiver/transmitter 1533USB universal serial bus 1534USWC uncacheable speculative write combining 1535UT unit test 1536UTC coordinated universal time 1537UTP unshielded twisted pair 1538UUCP Unix-to-Unix Copy Protocol 1539UUID universally unique identifier 1540UUOC useless use of cat 1541UUT unit under test 1542UX user experience 1543VA vertical alignment 1544VA virtual address 1545VA volt-ampere 1546VAX virtual address extension 1547VB Visual Basic 1548VCA variable-gain amplifier 1549VCC common collector voltage 1550VCF voltage-controlled filter 1551VCM virtual channel memory 1552VCO voltage-controlled oscillator 1553VCS version control system 1554VESA Video Electronics Standards Association 1555VFO variable-frequency oscillator 1556VFS virtual file system 1557VG volume group 1558VGA Video Graphics Array 1559VHDCI very high density cable interconnect 1560VID {VLAN,voltage level} identifier 1561VIM Vi IMproved 1562VIPT virtually indexed, physically tagged 1563VIVT virtually indexed, virtually tagged 1564VLAN virtual local area network 1565VLIW very long instruction word 1566VLSI very large scale integration 1567VLSM variable length subnet mask 1568VM virtual {machine,memory} 1569VME virtual mode extension 1570VMX vector multimedia extensions 1571VMX virtual machine extensions 1572VOD video on demand 1573VPN virtual private network 1574VR virtual reality 1575VRAM video random access memory 1576VRF virtual routing and forwarding 1577VRM voltage regulator module 1578VRRP Virtual Router Redundancy Protocol 1579VSTP VLAN Spanning Tree Protocol 1580VTP VLAN Trunking Protocol 1581W watt 1582W3C World Wide Web Consortium 1583WAMP Web Application Messaging Protocol 1584WAN wide area network 1585WAP Wireless Application Protocol 1586WAP wireless access point 1587WDM Windows Driver Model 1588WDDM Windows Display Driver Model 1589WDT watchdog timer 1590WEP Wired Equivalent Privacy 1591WFI wait for interrupt 1592WFQ weighted fair queuing 1593WH write hit 1594WIFI wireless fidelity 1595WLAN wireless local area network 1596WM write miss 1597WMI Windows Management Instrumentation 1598WOL Wake-on-LAN 1599WOM Wake-on-Modem 1600WOR Wake-on-Ring 1601WORM write once read many 1602WP WordPerfect 1603WP word processor 1604WP write protect 1605WPA Wi-Fi Protected Access 1606WPA2 Wi-Fi Protected Access II 1607WPS Wi-Fi Protected Setup 1608WRAM window random access memory 1609WS web services 1610WTC write through caching 1611WWAN wireless wide area network 1612WWW world wide web 1613WYSIAYG what you see is all you get 1614WYSIWYG what you see is what you get 1615XBAR crossbar 1616XDMCP X Display Manager control protocol 1617XER XML encoding rules 1618XGA Extended Graphics Array 1619XHR XMLHttpRequest 1620XIP execute in place 1621XML Extensible Markup Language 1622XNA XNA's not acronymed 1623XNS Xerox network systems 1624XOR exclusive or 1625XP extreme programming 1626XSI X/Open System Interface 1627XSL extensible stylesheet language 1628XSS cross site scripting 1629XT extended technology 1630XTI X/Open transport interface 1631XUL XML user interface language 1632YACC yet another compiler compiler 1633YAML YAML ain't markup language 1634YANG yet another next generation 1635YAWPFAPR you are welcome; please file a problem report 1636YP Yellow Pages 1637YTD year to date 1638ZAP ZFS attribute processor 1639ZBR zone bit recording 1640ZFOD zero-filled on demand 1641ZFS zettabyte file system 1642ZIF zero insertion force 1643ZIFS zero insertion force socket 1644ZIL ZFS intent log 1645ZMA zone multicast address 1646ZPL ZFS Posix layer 1647ZVOL ZFS Volume 1648