1$NetBSD: acronyms.comp,v 1.150 2015/08/22 19:18:10 dholland 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 9AC alternating current 10ACI adjacent channel interferer 11ACID atomicity, consistency, isolation, durability 12ACK Amsterdam compiler kit 13ACK acknowledgement 14ACL access control list 15ACL active current loop 16ACP auxillary control {process,program} 17ACPI advanced configuration and power interface 18ACS access control set 19ACU automatic calling unit 20ADB Apple desktop bus 21ADC analog [to] digital converter 22ADD acronym driven development 23ADO active data objects 24ADP automatic data processing 25ADPCM adaptive differential pulse code modulation 26ADS alternate data stream 27ADSL asymmetric digital subscriber line 28ADT abstract data type 29AES Advanced Encryption Standard 30AFS Andrew File System 31AGC automatic gain control 32AGP accelerated graphics port 33AI analog input 34AI artificial intelligence 35AL access list 36AL active link 37ALE address latch enable 38ALS ambient light sensor 39ALU arithmetic and logical unit 40AM access method 41AM alignment mask 42AM amplitude modulation 43AMI alternate mark inversion 44AMQP advanced message queuing protocol 45AMT active management technology 46AN Arabic number 47ANSI American National Standards Institute 48AO analog output 49AOL Alert-on-LAN 50AOS add or subtract 51AP access point 52AP application processor 53API application programming interface 54APIC advanced programmable interrupt controller 55APIPA automatic private IP addressing 56APT advanced persistent threat 57AQM active queue management 58ARAT always running APIC timer 59ARC adaptive replacement cache 60ARM Advanced RISC Machines 61ARP Address Resolution Protocol 62ARPA Advanced Research Projects Agency 63ARQ automatic repeat request 64ARR address range register 65ARU audio response unit 66AS autonomous system 67ASC advanced smart cache 68ASCII American Standard Code for Information Interchange 69ASD agile software development 70ASE advanced software environment 71ASIC application-specific integrated circuit 72ASK amplitude shif keying 73ASLR address space layout randomization 74ASN autonomous system number 75ASPM active state power management 76ASQ automated software quality 77ASR address space register 78AST abstract syntax tree 79AST asynchronous trap 80AT access time 81AT advanced technology 82ATA advanced technology attachment 83ATAPI advanced technology attachment packet interface 84ATC address translation cache 85ATM asynchronous transfer mode 86ATX advanced technology extended 87AV anti virus 88AVL Adelson-Velsky-Landis 89AVX advanced vector extensions 90BA byte align 91BAL basic assembly language 92BAR base address register 93BBS bulletin board system 94BCC blind carbon copy 95BCD binary coded decimal 96BCR byte count register 97BCS base configuration space 98BD baud 99BDD binary decision diagram 100BDI bit deinterleave 101BDUF big design up front 102BEDO burst extended data output 103BER basic encoding rules 104BER bit error {rate,ratio} 105BFD binary {file,format} descriptor 106BFKL big fscking kernel lock 107BFS breadth-first search 108BFT binary file transfer 109BGA ball grid array 110BGP Border Gateway Protocol 111BIND Berkeley Internet Name Daemon 112BIOS Basic Input/Output System 113BIOS built-in operating system 114BIST built-in self-test 115BIU bus interface unit 116BKDG BIOS and kernel developer's guide 117BLAS basic linear algebra subprograms 118BLC back light control 119BLOB binary large object 120BM bus master 121BMC baseboard management controller 122BMIC bus master interface controller 123BN boundary neutral 124BNF Backus-Naur form 125BO binary output 126BOF beginning of file 127BOM beginning of message 128BOM byte order mark 129BP base pointer 130BP boot processor 131BPB BIOS parameter block 132BPF Berkeley Packet Filter 133BPI bits per inch 134BPM business process modelling 135BPS bits per second 136BPSK binary phase shift keying 137BQS Berkeley quality software 138BRE basic regular expression 139BS backspace 140BS binary sequence 141BSA basic service area 142BSD Berkeley Software Distribution 143BSF bit scan forward 144BSOD blue screen of death 145BSP binary space partition 146BSP bootstrap processor 147BSR bit scan reverse 148BSS basic service set 149BSS block started by symbol 150BSSID basic service set identifier 151BT BitTorrent 152BT Bluetooth 153BT bit test 154BTC bit test [and] complement 155BTR bit test [and] reset 156BTS bit test [and] set 157BTS bits per second 158BW bandwidth 159BWM block-write mode 160CA certificate authority 161CAD computer-aided design 162CAM computer assisted manufacturing 163CAM conditional access module 164CAM content addressable memory 165CARP Common Address Redundancy Protocol 166CAS column address strobe 167CAS compare and swap 168CAS computer algebra system 169CASE computer aided software engineering 170CAU control access unit 171CAV constant angular velocity 172CBC cipher block chaining 173CBR constant bit rate 174CC carbon coby 175CCD charge coupled device 176CCI co-channel interferer 177CD cache disable 178CD compact disc 179CDDA compact disc digital audio 180CDMA code division multiple access 181CDRAM cache dynamic random access memory 182CER canonical encoding rules 183CF compact flash 184CFG context-free grammar 185CFG control-flow graph 186CG control gate 187CGA Color Graphics Adapter 188CGI common gateway interface 189CGN Carrier-Grade NAT 190CHAP Challenge-Handshake Authentication Protocol 191CHS cylinder/head/sector 192CI continuous integration 193CI {common,component} interface 194CIDR Classless Inter-Domain Routing 195CIFS Common Internet File System 196CIL common intermediate language 197CIR carrier-to-interference ratio 198CIS contact image sensor 199CISC complex instruction set {computer,computing} 200CJK Chinese, Japanese, [and] Korean 201CLF common log format 202CLI command line interface 203CLR common language runtime 204CLTT closed loop thermal throttling 205CLUT color look-up table 206CLV constant linear velocity 207CM configuration management 208CMA concert multithread architecture 209CMI control management interface 210CMI control method interface 211CMOS complementary metal-oxide-semiconductor 212CMP chip multi-processing 213CMS content management system 214CMYK cyan magenta yellow black 215CN {common,canonical} name 216CNC computer numerical control 217CNR carrier-to-noise ratio 218COF current operating frequency 219COFDM coded orthogonal frequency division multiplexing 220COFF common object file format 221COM component object model 222COMA cache-only memory architecture 223CORBA common object request broker architecture 224COW copy-on-write 225CP continuous pilot 226CPB core performance boost 227CPE common phase error 228CPG clock pulse generator 229CPL current privilege level 230CPLD complex programmable logic device 231CPP C preprocessor 232CPS characters per second 233CPT command pass through 234CPU central processing unit 235CR carriage return 236CRC cyclic redundancy check 237CRL carrier recovery loop 238CRLF carriage return line feed 239CRT cathode ray tube 240CS cable select 241CS chip select 242CS code segment 243CS computer science 244CSI channel state information 245CSI common system interface 246CSMA carrier sense multiple access 247CSMA/CA carrier sense multiple access with collision avoidance 248CSMA/CD carrier sense multiple access with collision detection 249CSR control [and] status registers 250CSRG Computer Systems Research Group 251CSS cascading style sheets 252CSV comma-separated values 253CTM close to metal 254CTS clear to send 255CUA common user access 256CUT coordinated universal time 257CV control voltage 258CVS Concurrent Versions System 259DA destination address 260DAA distributed application architecture 261DAB digital audio broadcasting 262DAC digital [to] analog converter 263DAC discretionary access control 264DAD duplicate address detection 265DAO disk at once 266DAP Directory Access Protocol 267DAT digital audio tape 268DAT dynamic acceleration technology 269DB database 270DBA database administrator 271DBA dynamic bandwidth allocation 272DBB data bus buffer 273DBC design by contract 274DBL dynamic buffer limiting 275DBMS database management system 276DBS database server 277DC direct current 278DCC Direct Client-to-Client 279DCC direct cable connect 280DCD data carrier detect 281DCE data control equipment 282DCE distributed computing environment 283DCOM distributed component object model 284DCOP Desktop COmmunication Protocol 285DCS data collection systems 286DCT discrete cosine transform 287DCU data cache unit 288DDC display data channel 289DDE dynamic data exchange 290DDK device driver kit 291DDL data description language 292DDR double data rate 293DDS direct digital sound 294DDWG Digital Display Working Group 295DE debugging extensions 296DE desktop environment 297DEA data encryption algorithm 298DEK data encryption key 299DEP data execution prevention 300DER distinguished encoding rules 301DES Data Encryption Standard 302DF don't fragment 303DFA deterministic finite automaton 304DFC data flow control 305DFS depth first search 306DFS distributed file system 307DFT diagnostic function test 308DFT discrete Fourier transform 309DGL data generation language 310DH Diffie-Hellman 311DHCP Dynamic Host Configuration Protocol 312DIFS distributed inter-frame space 313DIMM dual inline memory module 314DIRT design in real time 315DL diode logic 316DL discrete logarithm 317DL download 318DLE data link escape 319DLL dynamic link library 320DLP discrete logarithm problem 321DMA direct memory access 322DMI desktop management interface 323DMS document management system 324DMT discrete multitone modulation 325DNARD Digital network appliance reference design 326DND drag and drop 327DNS Domain Name System 328DOE distributed object environment 329DOF data over fibre 330DOM document object model 331DOS denial of service 332DOS disk operating system 333DP DisplayPort 334DPC deferred procedure call 335DPCM differential pulse code modulation 336DPD dead peer detection 337DPI deep packet inspection 338DPI dots per inch 339DPL descriptor privilege level 340DPS Display PostScript 341DPST display power savings technology 342DRAM dynamic random access memory 343DRI direct rendering infrastructure 344DRM digital rights management 345DRRS display refresh rate switching 346DS debug store 347DSA digital signature algorithm 348DSB double-sideband modulation 349DSDT differentiated system descriptor table 350DSL digital subscriber line 351DSL domain specific language 352DSLAM digital subscriber line access multiplexer 353DSN delivery status notification 354DSO dynamic shared object 355DSP digital signal processor 356DSSS direct sequence spread spectrum 357DTD document type definition 358DTE data terminal equipment 359DTE dumb terminal emulator 360DTL diode-transistor logic 361DTS digital thermal sensor 362DUT device under test 363DVB digital video broadcasting 364DVCS distributed version control system 365DVD digital versatile disc 366DVFS dynamic voltage and frequency scaling 367DVI device independent 368DVI Digital Visual Interface 369DVR digital video recorder 370E-XER extended XML encoding rules 371EABI embedded-application binary interface 372EAP Extensible Authentication Protocol 373EBR extended boot record 374EC elliptical curve 375ECC error correction code 376ECDL elliptical curve discrete logarithm 377ECDSA elliptical curve digital signature algorithm 378ECL emitter-coupled logic 379ECN explicit congestion notification 380ECP enhanced capability port 381ECS enhanced chip set 382ECS extended configuration space 383EDAT enhanced dynamic acceleration technology 384EDGE explicit data graph execution 385EDID extended display identification data 386EDO extended data out 387EDS electronical data sheet 388EEPROM electrically erasable programmable read only memory 389EFI extensible firmware interface 390EFL emitter follower logic 391EFM eight to fourteen modulation 392EGA Enhanced Graphics Adapter 393EGP exterior gateway protocol 394EH extension header 395EIDE enchanced IDE 396EISA extended industry standard architecture 397ELF executable and linking format 398ELS entry level system 399EMI electro-magnetic interference 400EMP electro-magnetic pulse 401EMR electro-magnetic radiation 402EOF end of file 403EOI end of interrupt 404EOL end of line 405EOT end of transmission 406EPIC explicitly parallel instruction computing 407EPP enhanced parallel port 408EPRML extended partial response, maximum likelihood 409EPROM erasable programmable read only memory 410ERD emergency recovery disk 411ERD entity relationship diagram 412ERE extended regular expression 413ESDRAM enhanced synchronous dynamic random access memory 414ESS electronic switching system 415ESS extended service set 416ESSID extended service set identifier 417EST enhanced speedstep 418ETL extract, transform, load 419EU execution unit 420EULA end user license agreement 421FAT file allocation table 422FBRAM frame buffer random access memory 423FCL fiber channel loop 424FCS frame check sequence 425FDC floppy disk controller 426FDD floppy disk drive 427FDDI fiber distributed data interface 428FDE full disk encryption 429FEA finite element analysis 430FEC forward error correction 431FET field-effect transistor 432FF form feed 433FFH functional fixed hardware 434FFI foreign function interface 435FFM focus follows mouse 436FFS Fast File System 437FFS find first set 438FFT fast Fourier transform 439FG floating gate 440FHSS frequency hop spread spectrum 441FID frequency identifier 442FIFO first in, first out 443FILO first in, last out 444FIR fast infrared 445FLOPS floating [point] operations per second 446FLOSS free/libre/open source software 447FM frequency modulation 448FMR false match rate 449FOSS free/open source software 450FPGA field programmable gate array 451FPM fast page mode 452FPR floating point register 453FPU floating point unit 454FQDN fully qualified domain name 455FRR false rejection rate 456FRU field replaceable unit 457FS file system 458FSB front side bus 459FSCK file system check 460FSF Free Software Foundation 461FSK frequency shift keying 462FSM finite-state machine 463FTA fault tree analysis 464FTL flash translation layer 465FTP File Transfer Protocol 466FTPS File Transfer Protocol Secure 467FUS fast user switching 468FWH firmware hub 469FWS folding white space 470GAL generic array logic 471GAS generic address structure 472GC garbage collector 473GCR group-coded recording 474GDT global descriptor table 475GEM graphics environment manager 476GEM graphics execution manager 477GENA general event notification architecture 478GHC Glasgow Haskell compiler 479GID group identifier 480GIF graphics interchange format 481GMCH graphics and memory controller hub 482GNU GNU's Not Unix 483GOT global offset table 484GPE general purpose event 485GPF general protection fault 486GPG GNU Privacy Guard 487GPL [GNU] General Public License 488GPR general purpose register 489GPS generalized processor sharing 490GPT GUID partition table 491GPU graphics processing unit 492GR golden ratio 493GRE generic routing encapsulation 494GSI global system interrupt 495GUI graphical user interface 496GUID globally unique identifier 497HA high availability 498HAL hardware abstraction layer 499HAT hashed array tree 500HBA host bus adapter 501HCF halt and catch fire 502HCI host controller interface 503HCI human-computer interaction 504HCL hardware compatibility list 505HDCP High-bandwidth Digital Content Protection 506HDD hard disk drive 507HDL hardware description language 508HDMI High-Definition Multimedia Interface 509HDTV high-definition television 510HF high frequency 511HFM highest frequency mode 512HID human interface device 513HLL high-level language 514HMA high memory area 515HMI human-machine interface 516HOOD hierarchical object oriented design 517HP Hewlett-Packard 518HPC high performance computing 519HPET high precision event timer 520HT hyper-threading 521HTC hardware thermal control 522HTCC high temperature co-fired ceramic 523HTML HyperText Markup Language 524HTT hyper-threading technology 525HTTP Hypertext Transfer Protocol 526HTTPS Hypertext Transfer Protocol Secure 527HVM hardware virtual machine 528HZ Hertz 529I2O intelligent input/output 530IA information assurance 531IANA Internet Assigned Numbers Authority 532IBC iterated block cipher 533IBM International Business Machines 534IBS instruction based sampling 535IBSS independent basic service set 536IC integrated circuit 537ICA independent computer architecture 538ICB Internet Citizen's Band 539ICE in-circuit emulator 540ICE internal compiler error 541ICH I/O controller hub 542ICMP Internet Control Message Protocol 543ICT information and communications technology 544ICW initialization command word 545IDA Intel dynamic acceleration 546IDCMP Intuition direct communication message port 547IDE integrated development environment 548IDE integrated drive electronics 549IDPS intrusion detection [and] prevention system 550IDRP inter-domain routing protocol 551IDS intrusion detection system 552IDT interrupt descriptor table 553IE Internet Explorer 554IEC International Electrotechnical Commission 555IEEE Institute of Electrical and Electronics Engineers 556IESG Internet Engineering Steering Group 557IETF Internet Engineering Task Force 558IF intermediate frequency 559IFCM isochronous flow control mode 560IFF Interchange File Format 561IGD Internet gateway device 562IGMP Internet Group Management Protocol 563IGP interior gateway protocol 564IHV independent hardware vendor 565IKE Internet key exchange 566ILM internal loopback mode 567ILOM integrated lights-out management 568ILP instruction level parallelism 569IM instant messaging 570IMAP Internet Message Access Protocol 571IMC integrated memory controller 572IMCR interrupt mode configuration register 573IMR interrupt mask register 574IMS information management system 575INCITS InterNational Committee for Information Technology Standards 576IO input/output 577IOCTL input/output control 578IOMMU input/output memory management unit 579IOT Internet of Things 580IP Internet Protocol 581IP intellectual property 582IPC interprocess communication 583IPE integrated programming environment 584IPI interprocessor interrupt 585IPNG Internet Protocol, Next Generation 586IPS in-plane switching 587IPS intrusion prevention system 588IPSEC Internet Protocol Security 589IRC Internet Relay Chat 590IRDA infrared data association 591IRQ interrupt request 592IRQL interrupt request level 593IRR interrupt request register 594IRTF Internet Research Task Force 595IS information system 596ISA industry standard architecture 597ISA instruction set architecture 598ISDN integrated services digital network 599ISI inter-symbol interference 600ISM industrial, scientific, [and] medical 601ISN initial serial number 602ISO International Standards Organization 603ISOC Internet Society 604ISP Internet service provider 605ISR in-service register 606ISR interrupt service routine 607IST interrupt stack table 608ISV independent software vendor 609IT information technology 610ITB Intel Turbo Boost 611IV initialization vector 612IVT interrupt vector table 613JBOD just a bunch of disks 614JFET junction [gate] field-effect transistor 615JIT just in time 616JPEG Joint Photographic Experts Group 617JRE Java Runtime Environment 618JTAG joint test action group 619KB keyboard 620KB kilobyte 621KBD keyboard 622KBD kilobaud 623KLOC thousand lines of code 624KMS kernel-mode setting 625KPI kernel programming interface 626KVA kernel virtual address 627KVM kernel virtual machine 628KVM kernel virtual memory 629KVM keyboard, video, [and] mouse 630LAMP Linux Apache MySQL {Perl,PHP,Python} 631LAN local area network 632LAPIC local advanced programmable interrupt controller 633LAR load access rights 634LBA logical block addressing 635LBS location-based service 636LCD liquid crystal display 637LCP link control protocol 638LDA local delivery agent 639LDAP Lightweight Directory Access Protocol 640LDR light-dependent resistor 641LDT local descriptor table 642LE logical extent 643LED light emitting diode 644LER label edge router 645LF line feed 646LF low frequency 647LFM lowest frequency mode 648LFN long file names 649LFO low-frequency oscillation 650LFS log-structured file system 651LFU least frequently used 652LHP loop heat pipe 653LIFO last in, first out 654LILO LInux LOader 655LILO last in, last out 656LINT local interrupt 657LIR local Internet registry 658LKM {Linux,loadable} kernel module 659LKML Linux kernel mailing list 660LL load linked 661LL/SC load linked/store conditional 662LLC logical link control 663LLDP link layer discovery protocol 664LLF low level format 665LLMNR link-local multicast name resolution 666LLVM Low Level Virtual Machine 667LM long mode 668LMM link management mode 669LNO loop nest optimization 670LOC lines of code 671LOM lights-out management 672LPC low pin count 673LPS local positioning system 674LRC longitudinal redundancy check 675LRM left-to-right mark 676LRO left-to-right override 677LRU least recently used 678LSB Linux standards base 679LSB least significant {bit,byte} 680LSI large scale integration 681LSL load segment limit 682LSN Large Scale NAT 683LSN log sequence number 684LSR label switch router 685LTCC low temperature co-fired ceramic 686LTO link time optimization 687LTR left to right 688LTR load task register 689LTR letter(-sized paper) 690LUN logical unit number 691LV logical volume 692LVM logical volume management 693LVT local vector table 694LWP light-weight process 695LZW Lempel Ziv Welch 696MAC mandatory access control 697MAC medium access control 698MAC message authentication {check,code} 699MADT multiple APIC descriptor table 700MB megabyte 701MBR master boot record 702MBS megabits per second 703MC memory controller 704MCA machine check architecture 705MCA MicroChannel architecture 706MCC multiversion concurrency control 707MCE machine check exception 708MCGA Multi-Color Graphics Array 709MCH memory controller hub 710MCM multi-chip module 711MCQ memory controlled queue 712MD machine-dependent 713MDA mail delivery agent 714MDA Monochrome Display Adapter 715MDRAM multibank dynamic random access memory 716MESI modified, exclusive, shared, invalid 717MFC merge from current 718MFC Microsoft Foundation Classes 719MFM modified frequency modulation 720MI machine-independent 721MIB management information base 722MIC message integrity {check,code} 723MID mobile Internet device 724MIDI musical instrument digital interface 725MIF management information format 726MIM man in the middle 727MIMD multiple instruction, multiple data 728MIME Multipurpose Internet Mail Extensions 729MIMO multiple input multiple output 730MIPS million instructions per second 731MISD multiple instruction, single data 732MIT Massachusetts Institute of Technology 733MITM man in the middle 734ML machine language 735ML machine learning 736ML mailing list 737ML markup language 738ML maximum likelihood 739MLC multi-level cell 740MLHP micro loop heat pipe 741MMIC monolithic microwave integrated circuit 742MMIO memory mapped input/output 743MMORPG massive multiplayer online role playing game 744MMU memory management unit 745MMX matrix math extension 746MMX multimedia extension 747MMX multiple math extension 748MO magneto-optical 749MOESI modified, owned, exclusive, shared, invalid 750MOF maximum operating frequency 751MOSFET metal-oxide-semiconductor field-effect transistor 752MOSI modified, owned, shared, invalid 753MP multi-platform 754MP multiplayer 755MP {multiprocessing,multiprocessor} 756MPEG moving picture experts group 757MPI message passing interface 758MPLS Multiprotocol Label Switching 759MPP massively parallel processor 760MPS memory pool system 761MPS multiprocessor specification 762MR modem ready 763MRU most recently used 764MS Microsoft 765MSB most significant {bit,byte} 766MSE mean square error 767MSF minutes seconds frames 768MSI message signaled interrupt 769MSI modified, shared, invalid 770MSR machine state register 771MSS maximum segment size 772MT machine translation 773MTA mail transfer agent 774MTBF mean time between failures 775MTP media transfer protocol 776MTRR memory type range register 777MTTF mean time to failure 778MTU maximum transmission unit 779MUA mail user agent 780MUD multi-user domain 781MVCC multiversion concurrency control 782MWE module width encoding 783MX mail exchange 784NACK negative acknowledgement 785NAN not a number 786NAPT Network Address Port Translation 787NAS network attached storage 788NAT network address translation 789NAV network allocation vector 790NC numerical control 791NCO numerically-controlled oscillator 792NCP Network Control Protocol 793NCQ native command queuing 794ND neighbor discovery 795NDFA nondeterministic finite automaton 796NE numeric error 797NFA nondeterministic finite automaton 798NFS network file system 799NIA next instruction address 800NIC network information center 801NIC network interface card 802NIDS network intrusion detection system 803NIP network interface protocol 804NIPS network intrusion prevention system 805NIS network information service 806NLS native language support 807NMI non-maskable interrupt 808NNTP Network News Transfer Protocol 809NOC network operations center 810NOP no operation 811NOS network operating system 812NP nondeterministic polynomial time 813NRZ non-return to zero 814NSA National Security Agency 815NTM non-deterministic Turing machine 816NTP Network Time Protocol 817NUMA non-uniform memory access 818NVRAM non-volatile random access memory 819NW not write-through 820NX no execute 821OAEP optimal asymmetric encryption padding 822OBO off by one 823OBOE off by one error 824OCL object constraint language 825OCR optical character recognition 826ODCM on-demand clock modulation 827ODT on-die termination 828OEM original equipment manufacturer 829OFDM orthogonal frequency division multiplexing 830OFET organic field-effect transistor 831OLAP online analytical processing 832OLE object linking and embedding 833OLTP online transaction processing 834ONFI open nand flash interface 835OO OpenOffice 836OO object oriented 837OOB out of band 838OOE out of order execution 839OOM out of memory 840OOO OpenOffice.org 841OOP object oriented programming 842OOPS object oriented programming systems 843OOSE object oriented software engineering 844OPM operations per minute 845OPS operations per second 846OQL Object Query Language 847ORB object request broker 848ORM object-relational mapping 849OS operating system 850OSD open source definition 851OSF open software foundation 852OSI Open Source Initiative 853OSI open systems interconnection 854OSPF open shortest path first 855OSPM OS power management 856OSS open sound system 857OSS open source software 858OSVW operating system visible workarounds 859OTP one time password 860OTP open telecom platform 861OU organizational unit 862OUI organizationally unique identifier 863OWL Web Ontology Language 864P2P PCI to PCI 865P2P peer to peer 866PA phase accumulator 867PA physical address 868PAC phase-amplitude converter 869PAE physical address extension 870PAL phase alternating line 871PAL programmable array logic 872PAM pluggable authentication modules 873PAM pulse amplitude modulation 874PAP password authentication protocol 875PAT page attribute table 876PAT port address translation 877PATA parallel ATA 878PAX portable archive exchange 879PBE pending break encoding 880PBE programming by example 881PC personal computer 882PC program counter 883PCB printed circuit board 884PCC Portable C Compiler 885PCD page-level cache disable 886PCE performance-monitor counter enable 887PCI peripheral component interconnect 888PCM phase change memory 889PCM pulse code modulation 890PCMCIA Personal Computer Memory Card International Association 891PCP Port Control Protocol 892PD public domain 893PDA personal digital assistant 894PDA pushdown automaton 895PDAG propositional directed acyclic graph 896PDB power distribution board 897PDF portable document format 898PDM pulse-duration modulation 899PDN pull-down network 900PDP page {descriptor,directory} page 901PDS product data sheet 902PDU protocol data unit 903PE protection enable 904PECI platform environment control interface 905PEP protocol extension protocol 906PER packed encoding rules 907PFS perfect forward secrecy 908PGAS partitioned global address space 909PGE page global enable 910PGP Pretty Good Privacy 911PHB PCI host bridge 912PHP PHP: Hypertext Preprocessor 913PIC position independent code 914PIC programmable interrupt controller 915PICNIC problem in chair, not in computer 916PID process id 917PIE position independent executable 918PIM personal information manager 919PIM platform-independent model 920PIO programmed input/output 921PIPT physically indexed, physically tagged 922PIQ prefetch input queue 923PIT programmable interrupt timer 924PIV personal identity verification 925PKCS public-key cryptography standards 926PKI public key infrastructure 927PLC programmable logic controller 928PLD programmable logic device 929PLL phase locked loop 930PLRU pseudo LRU 931PLTM package level thermal management 932PM power management 933PM {phase,pulse} modulation 934PME power management event 935PMI platform management interrupt 936PMIO port-mapped input/output 937PMT photo-multiplier tube 938PMU power management unit 939PNG portable network graphics 940PNP plug and play 941POE power over ethernet 942POF probability of failure 943POP Post Office Protocol 944POP power on password 945POSIX Portable Operating System Interface [for Unix] 946POST power on self test 947POTS plain old telephone system 948PP pair programming 949PPB PCI [to] PCI bridge 950PPC PowerPC 951PPI pixels per inch 952PPM pages per minute 953PPP Point-to-Point Protocol 954PPPOA Point-to-Point Protocol over ATM 955PPPOE Point-to-Point Protocol over Ethernet 956PPU physics processing unit 957PRBS pseudo-random bit sequence 958PRML partial response, maximum likelihood 959PRN pseudo random {noise,number} 960PRNG pseudo random number generator 961PROM programmable read only memory 962PSD power spectral density 963PSE page size extensions 964PSK phase shift keying 965PSK pre-shared key 966PSTN public switched telephone network 967PSW program status word 968PTE page table entry 969PTLA pseudo top level aggregator 970PTP page table page 971PTV perceived target value 972PU processing unit 973PUN physical unit number 974PV physical volume 975PVG physical volume group 976PVI protected-mode virtual interrupt 977PWM pulse width modulation 978PXE preboot execution environment 979QA quality assurance 980QAM quadrature amplitude modulation 981QAM quality assurance management 982QBE query by example 983QC quality control 984QDI quasi delay insensitive 985QOS quality of service 986R/O read only 987R/W read/write 988RA receiver address 989RA remote assistance 990RA resource affinity 991RA router advertisement 992RAD rapid application development 993RAID redundant array of {independent,inexpensive} disks 994RAM random access memory 995RAS reliability, availability and serviceability 996RAS remote access service 997RAS restartable atomic sequence 998RAS row address strobe 999RBF radial basis function 1000RBT red-black tree 1001RC release candidate 1002RC remote control 1003RCS Revision Control System 1004RCS revision control system 1005RCU read, copy, update 1006RDB Rigid Disk Block 1007RDBMS relational database management system 1008RDF Resource Description Framework 1009RDM relational data model 1010RDMA remote direct memory access 1011RE regular expression 1012REST representational state transfer 1013RF radio frequency 1014RFI radio frequency interference 1015RFO request for ownership 1016RGB red green blue 1017RGBA red green blue alpha 1018RH read hit 1019RHEL Red Hat Enterprise Linux 1020RHL Red Hat Linux 1021RIB routing information base 1022RIFF Resource Interchange File Format 1023RIP Routing Information Protocol 1024RIR regional Internet registry 1025RISC reduced instruction set {computer,computing} 1026RKM ROM Kernel Manual 1027RLE run length encoding 1028RLL run length limited 1029RLO right-to-left override 1030RM read miss 1031RMI remote method invocation 1032RMPM rapid memory power management 1033RMS root mean square 1034RMW read, modify, write 1035RNG random number generator 1036ROM read only memory 1037RPC remote procedure call 1038RPL requested privilege level 1039RPM revolutions per minute 1040RPN reverse Polish notation 1041RR random replacement 1042RR round robin 1043RS relay station 1044RSA Rivest, Shamir, [and] Adleman 1045RSIP Realm Specific IP 1046RSS really simple syndication 1047RSS residual sum of squares 1048RT real time 1049RTC real time clock 1050RTC real time computing 1051RTF rich text format 1052RTL register transfer language 1053RTL resistor-transistor logic 1054RTL right to left 1055RTOS real time operating system 1056RTS request to send 1057RTT round trip time 1058RUP rational unified process 1059RWM read-write memory 1060RX {receive,receiver} 1061S/PDIF Sony/Philips Digital Interface Format 1062SA security advisory 1063SA security association 1064SA source address 1065SA structured analysis 1066SAAS software as a service 1067SACD super audio compact disc 1068SAD security association database 1069SAL system abstraction layer 1070SAM serial access memory 1071SAM sum addressed memory 1072SAN storage area network 1073SAPIC streamlined advanced programmable interrupt controller 1074SASD structured analysis, structured design 1075SASI Shugart Associates System Interface 1076SASL simple authentication [and] security layer 1077SATA serial advanced technology attachment 1078SB sound blaster 1079SBU standard build unit 1080SC store conditional 1081SCA source code analyzer 1082SCADA supervisory control and data acquisition 1083SCC single chip cloud 1084SCC source code control 1085SCCS Source Code Control System 1086SCI scalable coherent interface 1087SCI system control interrupt 1088SCM software configuration management 1089SCM source code management 1090SCM storage-class memory 1091SCP secure copy 1092SCSI Small Computer System Interface 1093SCTP Stream Control Transmission Protocol 1094SDI symbol deinterleave 1095SDK software development kit 1096SDL Simple Declarative Language 1097SDL Simple Direct-media Layer 1098SDRAM synchronous dynamic random access memory 1099SDT syntax-directed translation 1100SEGV segmentation violation 1101SEO search engine optimization 1102SFC sequential function chart 1103SFI simple firmware interface 1104SFI software fault isolation 1105SFTP SSH File Transfer Protocol 1106SFTP Serial File Transfer Protocol 1107SFTP Simple File Transfer Protocol 1108SGRAM synchronous graphics random access memory 1109SIFS short inter-frame space 1110SIMD single instruction, multiple data 1111SIMM single inline memory module 1112SIP Session Initiation Protocol 1113SIR signal-to-interference ratio 1114SIR slow infrared 1115SISD single instruction, single data 1116SLC single-level cell 1117SLDRAM synchronous-link dynamic random access memory 1118SLED single large expensive disk 1119SLI scalable link interface 1120SLI scan-line interleave 1121SLOC source lines of code 1122SLRU segmented LRU 1123SMA smart memory access 1124SMAF system management action field 1125SMART self-monitoring analysis and reporting technology 1126SMBIOS System Management BIOS 1127SMC system management controller 1128SMI structure of management information 1129SMI system management interrupt 1130SMM system management mode 1131SMP symmetric multiprocessing 1132SMT simultaneous multithreading 1133SMTP Simple Mail Transfer Protocol 1134SMU system management unit 1135SNMP Simple Network Management Protocol 1136SNR signal-to-noise ratio 1137SOA service oriented architecture 1138SOAP Simple Object Access Protocol 1139SOC system on chip 1140SOF start of frame 1141SOH start of header 1142SOHO small office/home office 1143SOL serial over LAN 1144SP service pack 1145SP stack pointer 1146SPARC scalable processor architecture 1147SPARQL SPARQL Protocol and RDF Query Language 1148SPD security policy database 1149SPD serial presence detect 1150SPDIF Sony/Philips digital interface format 1151SPI serial peripheral interface 1152SPI stateful packet inspection 1153SPMD single process, multiple data 1154SPR special purpose register 1155SPT sectors per track 1156SQA software quality assurance 1157SQL Structured Query Language 1158SRAM static random access memory 1159SRC sample rate conversion 1160SS self-snoop 1161SS stack segment 1162SSB single-sideband modulation 1163SSD solid state drive 1164SSE streaming SIMD extensions 1165SSFDC solid state floppy disc card 1166SSH secure shell 1167SSI server side includes 1168SSID service set identifier 1169SSL secure sockets layer 1170SSP stack smashing protection 1171STC software thermal control 1172STD state transition diagram 1173STP Spanning Tree Protocol 1174STP shielded twisted pair 1175SUS Single Unix Specification 1176SUT system under test 1177SVG scalable vector graphics 1178SVGA Super Video Graphics Array 1179SVM secure virtual machine 1180SVM support vector machine 1181SVR System V Release 1182SWF Shockwave Flash 1183SWIG simplified wrapper [and] interface generator 1184SYR symbol timing recovery 1185TA test assertion 1186TA transmitter address 1187TAI international atomic time 1188TAO track at once 1189TAOCP The Art of Computer Programming 1190TAP Test Anything Protocol 1191TAS test and set 1192TB terabyte 1193TCB trace capture buffer 1194TCB trusted computing base 1195TCC thermal control circuit 1196TCL tool command language 1197TCP Transmission Control Protocol 1198TCQ tagged command queueing 1199TDC time [to] digital converter 1200TDD test driven development 1201TDD time division duplex 1202TDM time division multiplexing 1203TDMA time division multiple access 1204TDOA time difference of arrival 1205TDP thermal design {point,power} 1206TECO Text Editor and Corrector 1207TFT thin film transistor 1208TFTP Trivial File Transfer Protocol 1209TIAS try it and see 1210TIFF tagged image file format 1211TITS try it to see 1212TK temporal key 1213TKIP Temporal Key Integrity Protocol 1214TLA top level aggregator 1215TLB translation lookaside buffer 1216TLD top level domain 1217TLS thread local storage 1218TLS transport layer security 1219TM Turing machine 1220TM thermal monitor 1221TMDS transition minimized differential signaling 1222TMO timeout 1223TOD time of day 1224TOS terms of service 1225TOS trusted operating system 1226TOS type of service 1227TP transaction processing 1228TPI tracks per inch 1229TPM transactions per minute 1230TPM trusted platform module 1231TPR task priority register 1232TPS transactions per second 1233TPS transmission parameters signaling 1234TR task register 1235TR token ring 1236TRL timing recovery loop 1237TRNG true random number generator 1238TS terminal services 1239TS time series 1240TS time stamp 1241TS transport stream 1242TSC time stamp counter 1243TSD time stamp disable 1244TSL test, set, lock 1245TSO time sharing option 1246TSP Time-Stamp Protocol 1247TSP Tunnel Setup Protocol 1248TSP time synchronization protocol 1249TSP traveling salesman problem 1250TSS task state segment 1251TTL time to live 1252TTL transistor-transistor logic 1253TTM translation table maps 1254TTY teletype 1255TUI {terminal,text-based,textual} user interface 1256TX {transmit out,transmitter} 1257TZ time zone 1258UAC user {access,account} control 1259UART universal asynchronous receiver/transmitter 1260UAT user acceptance testing 1261UC uncacheable 1262UCS uniform-cost search 1263UDMA ultra DMA 1264UDO ultra density optical 1265UDP User Datagram Protocol 1266UFS Unix File System 1267UI unit interval 1268UI user interface 1269UID unique identifier 1270UID user identifier 1271UL upload 1272UMA uniform memory access 1273UMA upper memory area 1274UMB upper memory block 1275UML unified modeling language 1276UMPC ultra-mobile PC 1277UPNP universal plug and play 1278UPS uninterruptible power supply 1279URI uniform resource identifier 1280URL uniform resource locator 1281URN uniform resource name 1282USART universal synchronous/asynchronous receiver/transmitter 1283USB universal serial bus 1284USWC uncacheable speculative write combining 1285UT unit test 1286UTC coordinated universal time 1287UTP unshielded twisted pair 1288UUCP Unix-to-Unix Copy Protocol 1289UUID universally unique identifier 1290UUOC useless use of cat 1291UUT unit under test 1292UX user experience 1293VA vertical alignment 1294VA virtual address 1295VA volt-ampere 1296VAX virtual address extension 1297VB Visual Basic 1298VCA variable-gain amplifier 1299VCC common collector voltage 1300VCF voltage-controlled filter 1301VCM virtual channel memory 1302VCO voltage-controlled oscillator 1303VCS version control system 1304VESA Video Electronics Standards Association 1305VFO variable-frequency oscillator 1306VG volume group 1307VGA Video Graphics Array 1308VHDCI very high density cable interconnect 1309VID voltage level identifier 1310VIPT virtually indexed, physically tagged 1311VIVT virtually indexed, virtually tagged 1312VLAN virtual local area network 1313VLIW very long instruction word 1314VLSI very large scale integration 1315VLSM variable length subnet mask 1316VM virtual {machine,memory} 1317VME virtual mode extension 1318VMX vector multimedia extensions 1319VMX virtual machine extensions 1320VOD video on demand 1321VPN virtual private network 1322VR virtual reality 1323VRAM video random access memory 1324VRM voltage regulator module 1325VRRP Virtual Router Redundancy Protocol 1326W watt 1327W3C World Wide Web Consortium 1328WAN wide area network 1329WAP Wireless Application Protocol 1330WAP wireless access point 1331WDT watchdog timer 1332WEP Wired Equivalent Privacy 1333WFI wait for interrupt 1334WFQ weighted fair queuing 1335WH write hit 1336WIFI wireless fidelity 1337WLAN wireless local area network 1338WM write miss 1339WMI Windows Management Instrumentation 1340WOL Wake-on-LAN 1341WOM Wake-on-Modem 1342WOR Wake-on-Ring 1343WORM write once read many 1344WP WordPerfect 1345WP word processor 1346WP write protect 1347WPA Wi-Fi Protected Access 1348WPA2 Wi-Fi Protected Access II 1349WPS Wi-Fi Protected Setup 1350WRAM window random access memory 1351WS web services 1352WTC write through caching 1353WWAN wireless wide area network 1354WWW world wide web 1355WYSIWYG what you see is what you get 1356XBAR crossbar 1357XDMCP X Display Manager control protocol 1358XER XML encoding rules 1359XGA Extended Graphics Array 1360XIP execute in place 1361XML Extensible Markup Language 1362XOR exclusive or 1363XP extreme programming 1364XSI X/Open System Interface 1365XSL extensible stylesheet language 1366XSS cross site scripting 1367XT extended technology 1368XUL XML user interface language 1369YACC yet another compiler compiler 1370YAWPFAPR you are welcome; please file a problem report 1371YP Yellow Pages 1372YTD year to date 1373ZBR zone bit recording 1374ZFOD zero-filled on demand 1375ZIF zero insertion force 1376ZIFS zero insertion force socket 1377ZMA zone multicast address 1378