1$NetBSD: acronyms.comp,v 1.139 2013/08/07 05:19:40 agc 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 56AQM active queue management 57ARAT always running APIC timer 58ARC adaptive replacement cache 59ARM Advanced RISC Machines 60ARP Address Resolution Protocol 61ARPA Advanced Research Projects Agency 62ARQ automatic repeat request 63ARR address range register 64ARU audio response unit 65AS autonomous system 66ASC advanced smart cache 67ASCII American Standard Code for Information Interchange 68ASD agile software development 69ASE advanced software environment 70ASIC application-specific integrated circuit 71ASK amplitude shif keying 72ASLR address space layout randomization 73ASN autonomous system number 74ASPM active state power management 75ASQ automated software quality 76ASR address space register 77AST abstract syntax tree 78AST asynchronous trap 79AT access time 80AT advanced technology 81ATA advanced technology attachment 82ATAPI advanced technology attachment packet interface 83ATC address translation cache 84ATM asynchronous transfer mode 85ATX advanced technology extended 86AV anti virus 87AVL Adelson-Velsky-Landis 88AVX advanced vector extensions 89BA byte align 90BAL basic assembly language 91BAR base address register 92BBS bulletin board system 93BCC blind carbon copy 94BCD binary coded decimal 95BCR byte counte register 96BCS base configuration space 97BD baud 98BDD binary decision diagram 99BDI bit deinterleave 100BDUF big design up front 101BEDO burst extended data output 102BER basic encoding rules 103BER bit error {rate,ratio} 104BFD binary {file,format} descriptor 105BFKL big fscking kernel lock 106BFS breadth-first search 107BFT binary file transfer 108BGA ball grid array 109BGP Border Gateway Protocol 110BIND Berkeley Internet Name Daemon 111BIOS Basic Input/Output System 112BIOS built-in operating system 113BIST built-in self-test 114BIU bus interface unit 115BKDG BIOS and kernel developer's guide 116BLAS basic linear algebra subprograms 117BLC back light control 118BLOB binary large object 119BM bus master 120BMC baseboard management controller 121BMIC bus master interface controller 122BN boundary neutral 123BNF Backus-Naur form 124BO binary output 125BOF beginning of file 126BOM beginning of message 127BOM byte order mark 128BP base pointer 129BP boot processor 130BPB BIOS parameter block 131BPF Berkeley Packet Filter 132BPI bits per inch 133BPM business process modelling 134BPS bits per second 135BPSK binary phase shift keying 136BQS Berkeley quality software 137BRE basic regular expression 138BS binary sequence 139BSA basic service area 140BSD Berkeley Software Distribution 141BSF bit scan forward 142BSOD blue screen of death 143BSP binary space partition 144BSP bootstrap processor 145BSR bit scan reverse 146BSS basic service set 147BSS block started by symbol 148BSSID basic service set identifier 149BT BitTorrent 150BT Bluetooth 151BT bit test 152BTC bit test [and] complement 153BTR bit test [and] reset 154BTS bit test [and] set 155BTS bits per second 156BW bandwidth 157BWM block-write mode 158CA certificate authority 159CAD computer-aided design 160CAM computer assisted manufacturing 161CAM conditional access module 162CAM content addressable memory 163CARP Common Address Redundancy Protocol 164CAS column address strobe 165CAS compare and swap 166CAS computer algebra system 167CASE computer aided software engineering 168CAU control access unit 169CAV constant angular velocity 170CBC cipher block chaining 171CBR constant bit rate 172CC carbon coby 173CCD charge coupled device 174CCI co-channel interferer 175CD cache disable 176CD compact disc 177CDDA compact disc digital audio 178CDMA code division multiple access 179CDRAM cache dynamic random access memory 180CER canonical encoding rules 181CF compact flash 182CFG context-free grammar 183CFG control-flow graph 184CG control gate 185CGA Color Graphics Adapter 186CGI common gateway interface 187CGN Carrier-Grade NAT 188CHAP Challenge-Handshake Authentication Protocol 189CHS cylinder/head/sector 190CI continuous integration 191CI {common,component} interface 192CIDR Classless Inter-Domain Routing 193CIFS Common Internet File System 194CIL common intermediate language 195CIR carrier-to-interference ratio 196CIS contact image sensor 197CJK Chinese, Japanese, [and] Korean 198CLF common log format 199CLI command line interface 200CLR common language runtime 201CLTT closed loop thermal throttling 202CLUT color look-up table 203CLV constant linear velocity 204CM configuration management 205CMA concert multithread architecture 206CMI control management interface 207CMI control method interface 208CMOS complementary metal-oxide-semiconductor 209CMP chip multi-processing 210CMS content management system 211CMYK cyan magenta yellow black 212CN {common,canonical} name 213CNC computer numerical control 214CNR carrier-to-noise ratio 215COF current operating frequency 216COFDM coded orthogonal frequency division multiplexing 217COFF common object file format 218COM component object model 219COMA cache-only memory architecture 220CORBA common object request broker architecture 221COW copy-on-write 222CP continuous pilot 223CPB core performance boost 224CPE common phase error 225CPG clock pulse generator 226CPL current privilege level 227CPLD complex programmable logic device 228CPS characters per second 229CPT command pass through 230CPU central processing unit 231CR carriage return 232CRC cyclic redundancy check 233CRL carrier recovery loop 234CRLF carriage return line feed 235CRT cathode ray tube 236CS cable select 237CS chip select 238CS code segment 239CS computer science 240CSI channel state information 241CSI common system interface 242CSMA carrier sense multiple access 243CSMA/CA carrier sense multiple access with collision avoidance 244CSMA/CD carrier sense multiple access with collision detection 245CSR control [and] status registers 246CSS cascading style sheets 247CSV comma-separated values 248CTM close to metal 249CTS clear to send 250CUA common user access 251CUT coordinated universal time 252CV control voltage 253CVS Concurrent Versions System 254DA destination address 255DAA distributed application architecture 256DAB digital audio broadcasting 257DAC digital [to] analog converter 258DAC discretionary access control 259DAD duplicate address detection 260DAO disk at once 261DAP Directory Access Protocol 262DAT digital audio tape 263DAT dynamic acceleration technology 264DB database 265DBA dynamic bandwidth allocation 266DBB data bus buffer 267DBC design by contract 268DBL dynamic buffer limiting 269DBMS database management system 270DBS database server 271DC direct current 272DCC Direct Client-to-Client 273DCC direct cable connect 274DCD data carrier detect 275DCE data control equipment 276DCE distributed computing environment 277DCOM distributed component object model 278DCOP Desktop COmmunication Protocol 279DCS data collection systems 280DCT discrete cosine transform 281DCU data cache unit 282DDC display data channel 283DDE dynamic data exchange 284DDK device driver kit 285DDL data description language 286DDR double data rate 287DDS direct digital sound 288DDWG Digital Display Working Group 289DE debugging extensions 290DE desktop environment 291DEA data encryption algorithm 292DEK data encryption key 293DEP data execution prevention 294DER distinguished encoding rules 295DES Data Encryption Standard 296DF don't fragment 297DFA deterministic finite automaton 298DFC data flow control 299DFS depth first search 300DFS distributed file system 301DFT diagnostic function test 302DFT discrete Fourier transform 303DGL data generation language 304DH Diffie-Hellman 305DHCP Dynamic Host Configuration Protocol 306DIFS distributed inter-frame space 307DIMM dual inline memory module 308DIRT design in real time 309DL diode logic 310DL discrete logarithm 311DL download 312DLE data link escape 313DLL dynamic link library 314DLP discrete logarithm problem 315DMA direct memory access 316DMI desktop management interface 317DMS document management system 318DMT discrete multitone modulation 319DNARD Digital network appliance reference design 320DNS Domain Name System 321DOE distributed object environment 322DOF data over fibre 323DOM document object model 324DOS denial of service 325DOS disk operating system 326DP DisplayPort 327DPC deferred procedure call 328DPCM differential pulse code modulation 329DPD dead peer detection 330DPI deep packet inspection 331DPI dots per inch 332DPL descriptor privilege level 333DPST display power savings technology 334DRAM dynamic random access memory 335DRI direct rendering infrastructure 336DRM digital rights management 337DRRS display refresh rate switching 338DS debug store 339DSA digital signature algorithm 340DSB double-sideband modulation 341DSDT differentiated system descriptor table 342DSL digital subscriber line 343DSL domain specific language 344DSLAM digital subscriber line access multiplexer 345DSN delivery status notification 346DSO dynamic shared object 347DSP digital signal processor 348DSSS direct sequence spread spectrum 349DTD document type definition 350DTE data terminal equipment 351DTE dumb terminal emulator 352DTL diode-transistor logic 353DTS digital thermal sensor 354DUT device under test 355DVB digital video broadcasting 356DVCS distributed version control system 357DVD digital versatile disc 358DVFS dynamic voltage and frequency scaling 359DVI device independent 360DVI Digital Visual Interface 361DVR digital video recorder 362E-XER extended XML encoding rules 363EABI embedded-application binary interface 364EAP Extensible Authentication Protocol 365EBR extended boot record 366EC elliptical curve 367ECC error correction code 368ECDL elliptical curve discrete logarithm 369ECDSA elliptical curve digital signature algorithm 370ECL emitter-coupled logic 371ECN explicit congestion notification 372ECP enhanced capability port 373ECS enhanced chip set 374ECS extended configuration space 375EDAT enhanced dynamic acceleration technology 376EDGE explicit data graph execution 377EDID extended display identification data 378EDO extended data out 379EDS electronical data sheet 380EEPROM electrically erasable programmable read only memory 381EFI extensible firmware interface 382EFL emitter follower logic 383EFM eight to fourteen modulation 384EGA Enhanced Graphics Adapter 385EGP exterior gateway protocol 386EH extension header 387EIDE enchanced IDE 388EISA extended industry standard architecture 389ELF executable and linking format 390ELS entry level system 391EMI electro-magnetic interference 392EMP electro-magnetic pulse 393EMR electro-magnetic radiation 394EOF end of file 395EOI end of interrupt 396EOL end of line 397EOT end of transmission 398EPIC explicitly parallel instruction computing 399EPP enhanced parallel port 400EPRML extended partial response, maximum likelihood 401EPROM erasable programmable read only memory 402ERD emergency recovery disk 403ERE extended regular expression 404ESDRAM enhanced synchronous dynamic random access memory 405ESS electronic switching system 406ESS extended service set 407ESSID extended service set identifier 408EST enhanced speedstep 409ETL extract, transform, load 410EU execution unit 411EULA end user license agreement 412FAT file allocation table 413FBRAM frame buffer random access memory 414FCL fiber channel loop 415FCS frame check sequence 416FDC floppy disk controller 417FDD floppy disk drive 418FDDI fiber distributed data interface 419FDE full disk encryption 420FEA finite element analysis 421FEC forward error correction 422FET field-effect transistor 423FFH functional fixed hardware 424FFI foreign function interface 425FFM focus follows mouse 426FFS Fast File System 427FFS find first set 428FFT fast Fourier transform 429FG floating gate 430FHSS frequency hop spread spectrum 431FID frequency identifier 432FIFO first in, first out 433FILO first in, last out 434FIR fast infrared 435FLOPS floating [point] operations per second 436FLOSS free/libre/open source software 437FM frequency modulation 438FMR false match rate 439FOSS free/open source software 440FPGA field programmable gate array 441FPM fast page mode 442FPR floating point register 443FPU floating point unit 444FQDN fully qualified domain name 445FRR false rejection rate 446FRU field replaceable unit 447FS file system 448FSB front side bus 449FSCK file system check 450FSF Free Software Foundation 451FSK frequency shift keying 452FSM finite-state machine 453FTA fault tree analysis 454FTL flash translation layer 455FTP File Transfer Protocol 456FTPS File Transfer Protocol Secure 457FUS fast user switching 458FWH firmware hub 459FWS folding white space 460GAL generic array logic 461GAS generic address structure 462GC garbage collector 463GCR group-coded recording 464GDT global descriptor table 465GEM graphics environment manager 466GEM graphics execution manager 467GENA general event notification architecture 468GHC Glasgow Haskell compiler 469GID group identifier 470GIF graphics interchange format 471GMCH graphics and memory controller hub 472GNU GNU's Not Unix 473GOT global offset table 474GPE general purpose event 475GPF general protection fault 476GPG GNU Privacy Guard 477GPL [GNU] General Public License 478GPR general purpose register 479GPS generalized processor sharing 480GPT GUID partition table 481GPU graphics processing unit 482GR golden ratio 483GRE generic routing encapsulation 484GSI global system interrupt 485GUI graphical user interface 486GUID globally unique identifier 487HA high availability 488HAL hardware abstraction layer 489HAT hashed array tree 490HBA host bus adapter 491HCF halt and catch fire 492HCI host controller interface 493HCI human-computer interaction 494HCL hardware compatibility list 495HDCP High-bandwidth Digital Content Protection 496HDD hard disk drive 497HDL hardware description language 498HDMI High-Definition Multimedia Interface 499HDTV high-definition television 500HF high frequency 501HFM highest frequency mode 502HID human interface device 503HLL high-level language 504HMA high memory area 505HMI human-machine interface 506HOOD hierarchical object oriented design 507HP Hewlett-Packard 508HPC high performance computing 509HPET high precision event timer 510HT hyper-threading 511HTC hardware thermal control 512HTCC high temperature co-fired ceramic 513HTML HyperText Markup Language 514HTT hyper-threading technology 515HTTP Hypertext Transfer Protocol 516HTTPS Hypertext Transfer Protocol Secure 517HVM hardware virtual machine 518HZ Hertz 519I2O intelligent input/output 520IA information assurance 521IANA Internet Assigned Numbers Authority 522IBC iterated block cipher 523IBM International Business Machines 524IBS instruction based sampling 525IBSS independent basic service set 526IC integrated circuit 527ICA independent computer architecture 528ICB Internet Citizen's Band 529ICE in-circuit emulator 530ICE internal compiler error 531ICH I/O controller hub 532ICMP Internet Control Message Protocol 533ICT information and communications technology 534ICW initialization command word 535IDA Intel dynamic acceleration 536IDE integrated development environment 537IDE integrated drive electronics 538IDPS intrusion detection [and] prevention system 539IDRP inter-domain routing protocol 540IDS intrusion detection system 541IDT interrupt descriptor table 542IE Internet Explorer 543IEC International Electrotechnical Commission 544IEEE Institute of Electrical and Electronics Engineers 545IESG Internet Engineering Steering Group 546IETF Internet Engineering Task Force 547IF intermediate frequency 548IFCM isochronous flow control mode 549IGD Internet gateway device 550IGMP Internet Group Management Protocol 551IGP interior gateway protocol 552IHV independent hardware vendor 553IKE Internet key exchange 554ILM internal loopback mode 555ILP instruction level parallelism 556IM instant messaging 557IMAP Internet Message Access Protocol 558IMC integrated memory controller 559IMCR interrupt mode configuration register 560IMR interrupt mask register 561IMS information management system 562INCITS InterNational Committee for Information Technology Standards 563IO input/output 564IOCTL input/output control 565IOMMU input/output memory management unit 566IP Internet Protocol 567IP intellectual property 568IPC interprocess communication 569IPE integrated programming environment 570IPI interprocessor interrupt 571IPNG Internet Protocol, Next Generation 572IPS in-plane switching 573IPS intrusion prevention system 574IPSEC Internet Protocol Security 575IRC Internet Relay Chat 576IRDA infrared data association 577IRQ interrupt request 578IRQL interrupt request level 579IRR interrupt request register 580IRTF Internet Research Task Force 581IS information system 582ISA industry standard architecture 583ISA instruction set architecture 584ISDN integrated services digital network 585ISI inter-symbol interference 586ISM industrial, scientific, [and] medical 587ISN initial serial number 588ISO International Standards Organization 589ISOC Internet Society 590ISP Internet service provider 591ISR in-service register 592ISR interrupt service routine 593IST interrupt stack table 594ISV independent software vendor 595IT information technology 596ITB Intel Turbo Boost 597IV initialization vector 598IVT interrupt vector table 599JBOD just a bunch of disks 600JFET junction [gate] field-effect transistor 601JIT just in time 602JPEG Joint Photographic Experts Group 603JRE Java Runtime Environment 604JTAG joint test action group 605KB keyboard 606KB kilobyte 607KBD keyboard 608KBD kilobaud 609KLOC thousand lines of code 610KMS kernel-mode setting 611KPI kernel programming interface 612KVA kernel virtual address 613KVM kernel virtual memory 614KVM keyboard, video, [and] mouse 615LAMP Linux Apache MySQL {Perl,PHP,Python} 616LAN local area network 617LAPIC local advanced programmable interrupt controller 618LAR load access rights 619LBA logical block addressing 620LBS location-based service 621LCD liquid crystal display 622LCP link control protocol 623LDA local delivery agent 624LDAP Lightweight Directory Access Protocol 625LDR light-dependent resistor 626LDT local descriptor table 627LE logical extent 628LED light emitting diode 629LER label edge router 630LF line feed 631LF low frequency 632LFM lowest frequency mode 633LFN long file names 634LFO low-frequency oscillation 635LFS log-structured file system 636LFU least frequently used 637LHP loop heat pipe 638LIFO last in, first out 639LILO LInux LOader 640LILO last in, last out 641LINT local interrupt 642LIR local Internet registry 643LKM {Linux,loadable} kernel module 644LKML Linux kernel mailing list 645LL load linked 646LL/SC load linked/store conditional 647LLC logical link control 648LLF low level format 649LLMNR link-local multicast name resolution 650LLVM Low Level Virtual Machine 651LM long mode 652LMM link management mode 653LNO loop nest optimization 654LOC lines of code 655LPC low pin count 656LPS local positioning system 657LRC longitudinal redundancy check 658LRM left-to-right mark 659LRO left-to-right override 660LRU least recently used 661LSB Linux standards base 662LSB least significant {bit,byte} 663LSI large scale integration 664LSL load segment limit 665LSN Large Scale NAT 666LSR label switch router 667LTCC low temperature co-fired ceramic 668LTR left to right 669LTR load task register 670LUN logical unit number 671LV logical volume 672LVM logical volume management 673LVT local vector table 674LWP light-weight process 675LZW Lempel Ziv Welch 676MAC mandatory access control 677MAC medium access control 678MADT multiple APIC descriptor table 679MB megabyte 680MBR master boot record 681MBS megabits per second 682MC memory controller 683MCA machine check architecture 684MCC multiversion concurrency control 685MCE machine check exception 686MCGA Multi-Color Graphics Array 687MCH memory controller hub 688MCM multi-chip module 689MCQ memory controlled queue 690MD machine-dependent 691MDA mail delivery agent 692MDA Monochrome Display Adapter 693MDRAM multibank dynamic random access memory 694MESI modified, exclusive, shared, invalid 695MFC merge from current 696MFM modified frequency modulation 697MI machine-independent 698MIB management information base 699MID mobile Internet device 700MIDI musical instrument digital interface 701MIF management information format 702MIM man in the middle 703MIMD multiple instruction, multiple data 704MIME Multipurpose Internet Mail Extensions 705MIMO multiple input multiple output 706MIPS million instructions per second 707MISD multiple instruction, single data 708MIT Massachusetts Institute of Technology 709MITM man in the middle 710ML machine language 711ML machine learning 712ML mailing list 713ML markup language 714ML maximum likelihood 715MLC multi-level cell 716MLHP micro loop heat pipe 717MMIC monolithic microwave integrated circuit 718MMIO memory mapped input/output 719MMU memory management unit 720MMX matrix math extension 721MMX multimedia extension 722MMX multiple math extension 723MO magneto-optical 724MOESI modified, owned, exclusive, shared, invalid 725MOF maximum operating frequency 726MOSFET metal-oxide-semiconductor field-effect transistor 727MOSI modified, owned, shared, invalid 728MP multi-platform 729MP multiplayer 730MP {multiprocessing,multiprocessor} 731MPEG moving picture experts group 732MPI message passing interface 733MPLS Multiprotocol Label Switching 734MPP massively parallel processor 735MPS memory pool system 736MPS multiprocessor specification 737MR modem ready 738MRU most recently used 739MS Microsoft 740MSB most significant {bit,byte} 741MSE mean square error 742MSF minutes seconds frames 743MSI message signaled interrupt 744MSI modified, shared, invalid 745MSR machine state register 746MSS maximum segment size 747MT machine translation 748MTA mail transfer agent 749MTBF mean time between failures 750MTRR memory type range register 751MTTF mean time to failure 752MTU maximum transmission unit 753MUA mail user agent 754MUD multi-user domain 755MVCC multiversion concurrency control 756MWE module width encoding 757MX mail exchange 758NACK negative acknowledgement 759NAN not a number 760NAPT Network Address Port Translation 761NAS network attached storage 762NAT network address translation 763NAV network allocation vector 764NC numerical control 765NCO numerically-controlled oscillator 766NCP Network Control Protocol 767NCQ native command queuing 768ND neighbor discovery 769NE numeric error 770NFA nondeterministic finite automaton 771NFS network file system 772NIA next instruction address 773NIC network interface card 774NIDS network intrusion detection system 775NIP network interface protocol 776NIPS network intrusion prevention system 777NIS network information service 778NLS native language support 779NMI non-maskable interrupt 780NNTP Network News Transfer Protocol 781NOP no operation 782NP nondeterministic polynomial time 783NRZ non-return to zero 784NSA National Security Agency 785NTM non-deterministic Turing machine 786NTP Network Time Protocol 787NUMA non-uniform memory access 788NVRAM non-volatile random access memory 789NW not write-through 790NX no execute 791OAEP optimal asymmetric encryption padding 792OBO off by one 793OBOE off by one error 794OCL object constraint language 795OCR optical character recognition 796ODCM on-demand clock modulation 797ODT on-die termination 798OEM original equipment manufacturer 799OFDM orthogonal frequency division multiplexing 800OFET organic field-effect transistor 801OLE object linking and embedding 802ONFI open nand flash interface 803OO OpenOffice 804OO object oriented 805OOB out of band 806OOE out of order execution 807OOM out of memory 808OOO OpenOffice.org 809OOP object oriented programming 810OOSE object oriented software engineering 811OPM operations per minute 812OPS operations per second 813OQL Object Query Language 814ORM object-relational mapping 815OS operating system 816OSD open source definition 817OSF open software foundation 818OSI Open Source Initiative 819OSI open systems interconnection 820OSPF open shortest path first 821OSPM OS power management 822OSS open sound system 823OSS open source software 824OSVW operating system visible workarounds 825OTP one time password 826OTP open telecom platform 827OU organizational unit 828OUI organizationally unique identifier 829OWL Web Ontology Language 830P2P PCI to PCI 831P2P peer to peer 832PA phase accumulator 833PA physical address 834PAC phase-amplitude converter 835PAE physical address extension 836PAL phase alternating line 837PAL programmable array logic 838PAM pluggable authentication modules 839PAM pulse amplitude modulation 840PAP password authentication protocol 841PAT page attribute table 842PAT port address translation 843PATA parallel ATA 844PAX portable archive exchange 845PBE pending break encoding 846PBE programming by example 847PC personal computer 848PC program counter 849PCB printed circuit board 850PCC Portable C Compiler 851PCD page-level cache disable 852PCE performance-monitor counter enable 853PCI peripheral component interconnect 854PCM phase change memory 855PCM pulse code modulation 856PCMCIA Personal Computer Memory Card International Association 857PD public domain 858PDA personal digital assistant 859PDA pushdown automaton 860PDAG propositional directed acyclic graph 861PDB power distribution board 862PDF portable document format 863PDM pulse-duration modulation 864PDN pull-down network 865PDP page descriptor page 866PDS product data sheet 867PDU protocol data unit 868PE protection enable 869PECI platform environment control interface 870PEP protocol extension protocol 871PER packed encoding rules 872PFS perfect forward secrecy 873PGAS partitioned global address space 874PGE page global enable 875PGP Pretty Good Privacy 876PHB PCI host bridge 877PHP PHP: Hypertext Preprocessor 878PIC position independent code 879PIC programmable interrupt controller 880PICNIC problem in chair, not in computer 881PID process id 882PIE position independent executable 883PIM personal information manager 884PIM platform-independent model 885PIO programmed input/output 886PIPT physically indexed, physically tagged 887PIQ prefetch input queue 888PIT programmable interrupt timer 889PIV personal identity verification 890PKCS public-key cryptography standards 891PKI public key infrastructure 892PLC programmable logic controller 893PLD programmable logic device 894PLL phase locked loop 895PLRU pseudo LRU 896PLTM package level thermal management 897PM power management 898PM {phase,pulse} modulation 899PME power management event 900PMI platform management interrupt 901PMIO port-mapped input/output 902PMT photo-multiplier tube 903PMU power management unit 904PNG portable network graphics 905PNP plug and play 906POE power over ethernet 907POF probability of failure 908POP Post Office Protocol 909POP power on password 910POSIX Portable Operating System Interface [for Unix] 911POST power on self test 912POTS plain old telephone system 913PP pair programming 914PPB PCI [to] PCI bridge 915PPC PowerPC 916PPI pixels per inch 917PPM pages per minute 918PPP Point-to-Point Protocol 919PPPOA Point-to-Point Protocol over ATM 920PPPOE Point-to-Point Protocol over Ethernet 921PPU physics processing unit 922PRBS pseudo-random bit sequence 923PRML partial response, maximum likelihood 924PRN pseudo random {noise,number} 925PRNG pseudo random number generator 926PROM programmable read only memory 927PSD power spectral density 928PSE page size extensions 929PSK phase shift keying 930PSK pre-shared key 931PSTN public switched telephone network 932PSW program status word 933PTE page table entry 934PTLA pseudo top level aggregator 935PTP page table page 936PTV perceived target value 937PU processing unit 938PUN physical unit number 939PV physical volume 940PVG physical volume group 941PVI protected-mode virtual interrupt 942PWM pulse width modulation 943PXE preboot execution environment 944QA quality assurance 945QAM quadrature amplitude modulation 946QAM quality assurance management 947QBE query by example 948QC quality control 949QDI quasi delay insensitive 950QOS quality of service 951RA receiver address 952RA remote assistance 953RA resource affinity 954RA router advertisement 955RAD rapid application development 956RAID redundant array of {independent,inexpensive} disks 957RAM random access memory 958RAS remote access service 959RAS restartable atomic sequence 960RAS row address strobe 961RBF radial basis function 962RBT red-black tree 963RC release candidate 964RC remote control 965RCS Revision Control System 966RCS revision control system 967RCU read, copy, update 968RDF Resource Description Framework 969RDM relational data model 970RDMA remote direct memory access 971RE regular expression 972REST representational state transfer 973RF radio frequency 974RFI radio frequency interference 975RFO request for ownership 976RGB red green blue 977RH read hit 978RHL Red Hat Linux 979RIB routing information base 980RIFF Resource Interchange File Format 981RIP Routing Information Protocol 982RIR regional Internet registry 983RISC reduced instruction set computing 984RKM ROM Kernel Manual 985RLE run length encoding 986RLL run length limited 987RLO right-to-left override 988RM read miss 989RMI remote method invocation 990RMPM rapid memory power management 991RMS root mean square 992RMW read, modify, write 993RNG random number generator 994ROM read only memory 995RPC remote procedure call 996RPL requested privilege level 997RPM revolutions per minute 998RR random replacement 999RR round robin 1000RS relay station 1001RSA Rivest, Shamir, [and] Adleman 1002RSIP Realm Specific IP 1003RSS really simple syndication 1004RSS residual sum of squares 1005RT real time 1006RTC real time clock 1007RTC real time computing 1008RTF rich text format 1009RTL resistor-transistor logic 1010RTOS real time operating system 1011RTS request to send 1012RTT round time trip 1013RUP rational unified process 1014RWM read-write memory 1015RX {receive,receiver} 1016S/PDIF Sony/Philips Digital Interface Format 1017SA security advisory 1018SA security association 1019SA source address 1020SA structured analysis 1021SAAS software as a service 1022SACD super audio compact disc 1023SAD security association database 1024SAL system abstraction layer 1025SAM serial access memory 1026SAM sum addressed memory 1027SAN storage area network 1028SAPIC streamlined advanced programmable interrupt controller 1029SASD structured analysis, structured design 1030SASI Shugart Associates System Interface 1031SASL simple authentication [and] security layer 1032SATA serial advanced technology attachment 1033SB sound blaster 1034SBU standard build unit 1035SC store conditional 1036SCA source code analyzer 1037SCADA supervisory control and data acquisition 1038SCC single chip cloud 1039SCC source code control 1040SCCS Source Code Control System 1041SCI scalable coherent interface 1042SCI system control interrupt 1043SCM software configuration management 1044SCM source code management 1045SCP secure copy 1046SCSI Small Computer System Interface 1047SCTP Stream Control Transmission Protocol 1048SDI symbol deinterleave 1049SDK software development kit 1050SDL Simple Declarative Language 1051SDRAM synchronous dynamic random access memory 1052SDT syntax-directed translation 1053SEGV segmentation violation 1054SEO search engine optimization 1055SFC sequential function chart 1056SFI simple firmware interface 1057SFTP SSH File Transfer Protocol 1058SFTP Serial File Transfer Protocol 1059SFTP Simple File Transfer Protocol 1060SGRAM synchronous graphics random access memory 1061SIFS short inter-frame space 1062SIMD single instruction, multiple data 1063SIMM single inline memory module 1064SIP Session Initiation Protocol 1065SIR signal-to-interference ratio 1066SIR slow infrared 1067SISD single instruction, single data 1068SLC single-level cell 1069SLDRAM synchronous-link dynamic random access memory 1070SLI scalable link interface 1071SLI scan-line interleave 1072SLOC source lines of code 1073SLRU segmented LRU 1074SMA smart memory access 1075SMAF system management action field 1076SMART self-monitoring analysis and reporting technology 1077SMBIOS System Management BIOS 1078SMC system management controller 1079SMI structure of management information 1080SMI system management interrupt 1081SMM system management mode 1082SMP symmetric multiprocessing 1083SMT simultaneous multithreading 1084SMTP Simple Mail Transfer Protocol 1085SMU system management unit 1086SNMP Simple Network Management Protocol 1087SNR signal-to-noise ratio 1088SOA service oriented architecture 1089SOAP Simple Object Access Protocol 1090SOC system on chip 1091SOF start of frame 1092SOHO small office/home office 1093SOL serial over LAN 1094SP service pack 1095SP stack pointer 1096SPARC scalable processor architecture 1097SPARQL SPARQL Protocol and RDF Query Language 1098SPD security policy database 1099SPD serial presence detect 1100SPDIF Sony/Philips digital interface format 1101SPI serial peripheral interface 1102SPI stateful packet inspection 1103SPMD single process, multiple data 1104SPR special purpose register 1105SPT sectors per track 1106SQA software quality assurance 1107SQL Structured Query Language 1108SRAM static random access memory 1109SRC sample rate conversion 1110SS self-snoop 1111SS stack segment 1112SSB single-sideband modulation 1113SSD solid state drive 1114SSE streaming SIMD extensions 1115SSFDC solid state floppy disc card 1116SSH secure shell 1117SSI server side includes 1118SSID service set identifier 1119SSL secure sockets layer 1120SSP stack smashing protection 1121STC software thermal control 1122STD state transition diagram 1123STP Spanning Tree Protocol 1124STP shielded twisted pair 1125SUS Single Unix Specification 1126SUT system under test 1127SVG scalable vector graphics 1128SVGA Super Video Graphics Array 1129SVM secure virtual machine 1130SVM support vector machine 1131SVR System V Release 1132SWF Shockwave Flash 1133SWIG simplified wrapper [and] interface generator 1134SYR symbol timing recovery 1135TA test assertion 1136TA transmitter address 1137TAI international atomic time 1138TAO track at once 1139TAOCP The Art of Computer Programming 1140TAP Test Anything Protocol 1141TAS test and set 1142TB terabyte 1143TCB trace capture buffer 1144TCB trusted computing base 1145TCC thermal control circuit 1146TCL tool command language 1147TCP Transmission Control Protocol 1148TCQ tagged command queueing 1149TDC time [to] digital converter 1150TDD test driven development 1151TDD time division duplex 1152TDM time division multiplexing 1153TDMA time division multiple access 1154TDOA time difference of arrival 1155TDP thermal design {point,power} 1156TECO Text Editor and Corrector 1157TFT thin film transistor 1158TFTP Trivial File Transfer Protocol 1159TIAS try it and see 1160TIFF tagged image file format 1161TITS try it to see 1162TK temporal key 1163TKIP Temporal Key Integrity Protocol 1164TLA top level aggregator 1165TLB transition lookaside buffer 1166TLD top level domain 1167TLS thread local storage 1168TLS transport layer security 1169TM Turing machine 1170TM thermal monitor 1171TMDS transition minimized differential signaling 1172TMO timeout 1173TOD time of day 1174TOS terms of service 1175TOS trusted operating system 1176TOS type of service 1177TP transaction processing 1178TPM transactions per minute 1179TPM trusted platform module 1180TPR task priority register 1181TPS transmission parameters signaling 1182TR task register 1183TR token ring 1184TRL timing recovery loop 1185TRNG true random number generator 1186TS terminal services 1187TS time series 1188TS time stamp 1189TS transport stream 1190TSC time stamp counter 1191TSD time stamp disable 1192TSL test, set, lock 1193TSO time sharing option 1194TSP Time-Stamp Protocol 1195TSP Tunnel Setup Protocol 1196TSP time synchronization protocol 1197TSP traveling salesman problem 1198TSS task state segment 1199TTL time to live 1200TTL transistor-transistor logic 1201TTM translation table maps 1202TTY teletype 1203TUI {terminal,text-based,textual} user interface 1204TX {transmit out,transmitter} 1205TZ time zone 1206UAC user {access,account} control 1207UART universal asynchronous receiver/transmitter 1208UAT user acceptance testing 1209UC uncacheable 1210UCS uniform-cost search 1211UDMA ultra DMA 1212UDO ultra density optical 1213UDP User Datagram Protocol 1214UFS Unix File System 1215UI unit interval 1216UI user interface 1217UID unique identifier 1218UID user identifier 1219UL upload 1220UMA uniform memory access 1221UMA upper memory area 1222UMB upper memory block 1223UML unified modeling language 1224UMPC ultra-mobile PC 1225UPNP universal plug and play 1226UPS uninterruptible power supply 1227URI uniform resource identifier 1228URL uniform resource locator 1229URN uniform resource name 1230USART universal synchronous/asynchronous receiver/transmitter 1231USB universal serial bus 1232USWC uncacheable speculative write combining 1233UT unit test 1234UTC coordinated universal time 1235UTP unshielded twisted pair 1236UUCP Unix-to-Unix Copy Protocol 1237UUID universally unique identifier 1238UUOC useless use of cat 1239UUT unit under test 1240UX user experience 1241VA vertical alignment 1242VA virtual address 1243VA volt-ampere 1244VAX virtual address extension 1245VB Visual Basic 1246VCA variable-gain amplifier 1247VCC common collector voltage 1248VCF voltage-controlled filter 1249VCM virtual channel memory 1250VCO voltage-controlled oscillator 1251VCS version control system 1252VESA Video Electronics Standards Association 1253VFO variable-frequency oscillator 1254VG volume group 1255VGA Video Graphics Array 1256VHDCI very high density cable interconnect 1257VID voltage level identifier 1258VIPT virtually indexed, physically tagged 1259VIVT virtually indexed, virtually tagged 1260VLAN virtual local area network 1261VLIW very long instruction word 1262VLSI very large scale integration 1263VLSM variable length subnet mask 1264VM virtual {machine,memory} 1265VME virtual mode extension 1266VMX vector multimedia extensions 1267VMX virtual machine extensions 1268VOD video on demand 1269VPN virtual private network 1270VR virtual reality 1271VRAM video random access memory 1272VRM voltage regulator module 1273VRRP Virtual Router Redundancy Protocol 1274W watt 1275W3C World Wide Web Consortium 1276WAN wide area network 1277WAP Wireless Application Protocol 1278WAP wireless access point 1279WDT watchdog timer 1280WEP Wired Equivalent Privacy 1281WFI wait for interrupt 1282WFQ weighted fair queuing 1283WH write hit 1284WIFI wireless fidelity 1285WLAN wireless local area network 1286WM write miss 1287WMI Windows Management Instrumentation 1288WOL Wake-on-LAN 1289WOM Wake-on-Modem 1290WOR Wake-on-Ring 1291WORM write once read many 1292WP WordPerfect 1293WP word processor 1294WP write protect 1295WPA Wi-Fi Protected Access 1296WPA2 Wi-Fi Protected Access II 1297WPS Wi-Fi Protected Setup 1298WRAM window random access memory 1299WS web services 1300WTC write through caching 1301WWAN wireless wide area network 1302WWW world wide web 1303WYSIWYG what you see is what you get 1304XBAR crossbar 1305XER XML encoding rules 1306XGA Extended Graphics Array 1307XIP execute in place 1308XML Extensible Markup Language 1309XOR exclusive or 1310XP extreme programming 1311XSL extensible stylesheet language 1312XSS cross site scripting 1313XT extended technology 1314XUL XML user interface language 1315YACC yet another compiler compiler 1316YAWPFAPR you are welcome; please file a problem report 1317YP Yellow Pages 1318YTD year to date 1319ZBR zone bit recording 1320ZFOD zero-filled on demand 1321ZIF zero insertion force 1322ZIFS zero insertion force socket 1323ZMA zone multicast address 1324