acronyms.comp revision 1.120
1$NetBSD: acronyms.comp,v 1.120 2011/02/19 18:02:32 jruoho Exp $ 2 33WHS three-way handshake 4AA anti-aliasing 5AAT average access time 6ABI application binary interface 7AC alternating current 8ACID atomicity, consistency, isolation, durability 9ACK acknowledgement 10ACK Amsterdam compiler kit 11ACL access control list 12ACL active current loop 13ACPI advanced configuration and power interface 14ADB Apple desktop bus 15ADC analog [to] digital converter 16ADT abstract data type 17ADPCM adaptive differential pulse code modulation 18ADSL asymmetric digital subscriber line 19AES Advanced Encryption Standard 20AFS Andrew File System 21AGP accelerated graphics port 22AI artificial intelligence 23AL access list 24AL active link 25ALE address latch enable 26ALU arithmetic and logical unit 27AM access method 28AM amplitude modulation 29AMI alternate mark inversion 30AMT active management technology 31ANSI American National Standards Institute 32AOL alert on LAN 33AP access point 34AP application processor 35API application programming interface 36APIC advanced programmable interrupt controller 37ARAT always running APIC timer 38ARC adaptive replacement cache 39ARM Advanced RISC Machines 40ARP address resolution protocol 41ARPA Advanced Research Projects Agency 42ARQ automatic repeat request 43AS autonomous system 44ASCII American standard code for information interchange 45ASIC application-specific integrated circuit 46ASLR address space layout randomization 47ASN autonomous system number 48AST abstract syntax tree 49AST asynchronous trap 50AT access time 51AT advanced technology 52ATA advanced technology attachment 53ATAPI advanced technology attachment packet interface 54ATC address translation cache 55ATM asynchronous transfer mode 56ATX advanced technology extended 57AWK Aho, Werner, and Kernighan 58BAL basic assembly language 59BAR base address register 60BBS bulletin board system 61BCD binary coded decimal 62BCS base configuration space 63BD baud 64BEDO burst extended data output 65BER basic encoding rules 66BER bit error rate 67BFD binary {file, format} descriptor 68BFKL big fscking kernel lock 69BFS breadth-first search 70BGA ball grid array 71BGP border gateway protocol 72BIND Berkeley Internet Name Daemon 73BIOS basic input/output system 74BIST built-in self-test 75BKDG BIOS and kernel developer's guide 76BLAS basic linear algebra subprograms 77BLOB binary large object 78BMC baseboard management controller 79BP base pointer 80BP boot processor 81BPF Berkeley packet filter 82BPS bits per second 83BQS Berkeley quality software 84BSD Berkeley software distribution 85BSOD blue screen of death 86BSP binary space partition 87BSP boot strap processor 88BSS block started by symbol 89BT Bluetooth 90BT BitTorrent 91BTS bits per second 92BW bandwidth 93CAD computer-aided design 94CAM computer assisted manufacturing 95CAM content addressable memory 96CARP common address redundancy protocol 97CAS (atomic) compare and swap 98CAS computer algebra system 99CAS column address strobe 100CAV constant angular velocity (as opposed to CLV) 101CCD charge coupled device 102CD compact disc 103CDDA compact disc digital audio 104CDRAM cache dynamic random access memory 105CER canonical encoding rules 106CF compact flash 107CFG context-free grammar 108CFG control-flow graph 109CG control gate 110CGA color graphics {array,adapter} 111CGI common gateway interface 112CHAP challenge-handshake authentication protocol 113CHS cylinder/head/sector 114CIDR classless inter-domain routing 115CIFS common internet file system 116CIL common intermediate language 117CIS contact image sensor 118CJK Chinese, Japanese, and Korean 119CLI command line interface 120CLR common language runtime 121CLUT color look-up table 122CLV constant linear velocity (as opposed to CAV) 123CMI control management interface 124CMI control method interface 125CMOS complementary metal-oxide-semiconductor 126CMS content management system 127CMYK cyan magenta yellow black 128CN {common, canonical} name 129CNC computer numerical control 130COF current operating frequency 131COFF common object file format 132COMA cache-only memory architecture 133COW copy-on-write 134CPL current privilege level 135CPS characters per second 136CPU central processing unit 137CR carriage return 138CRC cyclic redundancy check 139CRLF carriage return line feed 140CRT cathode ray tube 141CS computer science 142CS cable select 143CS chip select 144CS code segment 145CSI common system interface 146CSMA carrier sense multiple access 147CSMA/CA carrier sense multiple access with collision avoidance 148CSMA/CD carrier sense multiple access with collision detection 149CSS cascading style sheets 150CTM close to metal 151CTS clear to send 152CUA common user access 153CVS concurrent versions system 154DAC discretionary access control 155DAC digital [to] analog converter 156DAO disk at once 157DAP directory access protocol 158DAT digital audio tape 159DB database 160DBMS database management system 161DC direct current 162DCC direct client [to] client 163DCE data control equipment 164DCE distributed computing environment 165DCT discrete cosine transform 166DDC display data channel 167DDE dynamic data exchange 168DDR double data rate 169DDWG digital display working group 170DE desktop environment 171DE debugging extensions 172DEP data execution prevention 173DER distinguished encoding rules 174DES Data Encryption Standard 175DFA deterministic finite automaton 176DFS depth first search 177DFS distributed file system 178DFT discrete Fourier transform 179DHCP dynamic host configuration protocol 180DIFS distributed inter-frame space 181DIMM dual inline memory module 182DL download 183DL diode logic 184DLE data link escape 185DLL dynamic link library 186DMA direct memory access 187DMI desktop management interface 188DNARD Digital network appliance reference design 189DNS domain name system 190DOM document object model 191DOS denial of service 192DOS disk operating system 193DPC deferred procedure call 194DPCM differential pulse code modulation 195DPD dead peer detection 196DPI dots per inch 197DPI deep packet inspection 198DPL descriptor privilege level 199DRAM dynamic random access memory 200DRI direct rendering infrastructure 201DRM digital rights management 202DS debug store 203DSDT differentiated system descriptor table 204DSL digital subscriber line 205DSL domain specific language 206DSLAM digital subscriber line access multiplexer 207DSO dynamic shared object 208DSP digital signal processor 209DSSS direct sequence spread spectrum 210DTD document type definition 211DTE data terminal equipment 212DTE dumb terminal emulator 213DTL diode-transistor logic 214DVB digital video broadcasting 215DVD digital versatile disc 216DVFS dynamic voltage and frequency scaling 217DVR digital video recorder 218DVI digital visual interface 219E-XER extended XML encoding rules 220EAP extensible authentication protocol 221ECL emitter-coupled logic 222ECN explicit congestion notification 223ECP enhanced capability port 224EDID extended display identification data 225EDO extended data out 226EEPROM electrically erasable programmable read only memory 227EFI extensible firmware interface 228EFM eight to fourteen modulation 229EGA enhanced graphics {array,adapter} 230EGP exterior gateway protocol 231EIDE enchanced IDE 232EISA extended industry standard architecture 233ELF executable and linking format 234EOF end of file 235EOL end of line 236EOL end of life 237EOT end of transmission 238EPIC explicitly parallel instruction computing 239EPP enhanced parallel port 240EPRML extended partial response, maximum likelihood 241EPROM erasable programmable read only memory 242ESDRAM enhanced synchronous dynamic random access memory 243EST enhanced speedstep 244ETL extract, transform, load 245EULA end user license agreement 246FAT file allocation table 247FBRAM frame buffer random access memory 248FCS frame check sequence 249FDC floppy disk controller 250FDD floppy disk drive 251FDDI fiber distributed data interface 252FEC forward error correction 253FFH functional fixed hardware 254FFI foreign function interface 255FFS fast file system 256FFS find first set 257FFT fast Fourier transform 258FG floating gate 259FHSS frequency hop spread spectrum 260FID frequency identifier 261FIFO first in first out 262FIR fast infrared 263FLOPS floating [point] operations per second 264FM frequency modulation 265FOSS free / open source software 266FPGA field programmable gate array 267FPM fast page mode 268FPR floating point register 269FPU floating point unit 270FQDN fully qualified domain name 271FRU field replaceable unit 272FSB front side bus 273FSCK file system check 274FSM finite-state machine 275FTP file transfer protocol 276FTPS file transfer protocol, secure 277FWH firmware hub 278FWS folding white space 279GAS generic address structure 280GC garbage collector 281GCR group-coded recording 282GDT global descriptor table 283GEM graphics execution manager 284GEM graphics environment manager 285GID group identifier 286GIF graphics interchange format 287GMCH graphics and memory controller hub 288GNU GNU's not Unix 289GOT global offset table 290GPE general purpose event 291GPF general protection fault 292GPL GNU/general public license 293GPR general purpose register 294GPT GUID partition table 295GPU graphics processing unit 296GRE generic routing encapsulation 297GSI global system interrupt 298GUI graphics user interface 299GUID globally unique identifier 300HA high availability 301HAL hardware abstraction layer 302HAT hashed array tree 303HBA host bus adapter 304HCI host controller interface 305HCI human-computer interaction 306HCL hardware compatibility list 307HCF halt and catch fire 308HDD hard disk drive 309HDCP high-bandwidth digital content protection 310HF high frequency 311HFM highest frequency mode 312HID human interface device 313HMA high memory area 314HMI human-machine interface 315HPC high performance computing 316HPET high precision event timer 317HT hyper-threading 318HTC hardware thermal control 319HTML hyper-text markup language 320HTT hyper-threading technology 321HTTP hyper-text transfer protocol 322HTTPS hyper-text transfer protocol, secure 323HZ Hertz 324I2O intelligent input/output 325IANA Internet assigned number authority 326IBS instruction based sampling 327IC integrated circuit 328ICB Internet citizen's band 329ICE in-circuit emulator 330ICH I/O controller hub 331ICE internal compiler error 332ICE in-circuit emulator 333ICMP Internet control message protocol 334IDE integrated drive electronics 335IDE integrated development environment 336IDRP inter-domain routing protocol 337IDS intrusion detection system 338IDT interrupt descriptor table 339IE Internet Explorer 340IEC international electrotechnical commission 341IEEE Institute [of] Electrical [and] Electronics Engineers 342IESG Internet Engineering Steering Group 343IETF Internet Engineering Task Force 344IFCM isochronous flow control mode 345IGMP Internet group management protocol 346IGP interior gateway protocol 347IHV independent hardware vendor 348IKE Internet key exchange 349ILP instruction level parallelism 350IM instant messaging 351IMC integrated memory controller 352IMCR interrupt mode configuration register 353IMAP Internet mail access protocol 354INCITS international committee on information technology standards 355IO input/output 356IOCTL input/output control 357IOMMU input/output memory management unit 358IP Internet Protocol 359IP intellectual property 360IPC interprocess communication 361IPI interprocessor interrupt 362IPNG Internet protocol, next generation 363IPS intrusion prevention system 364IPS in-plane switching 365IPSEC Internet protocol security 366IRC Internet relay chat 367IRDA infrared data association 368IRQ interrupt request 369IRQL interrupt request level 370IRTF Internet research task force 371ISA industry standard architecture 372ISA instruction set architecture 373ISDN integrated services digital network 374ISI inter-symbol interference 375ISM industrial, scientific and medical 376ISN initial serial number 377ISO international standards organization 378ISOC Internet society 379ISP Internet service provider 380ISR interrupt service routine 381IST interrupt stack table 382ISV independent software vendor 383IVT interrupt vector table 384JBOD just a bunch of disks 385JIT just in time 386JPEG joint photographic experts group 387JRE Java runtime environment 388JTAG joint test action group 389KB keyboard 390KB kilobyte 391KBD keyboard 392KBD kilobaud 393KLOC thousand lines of code 394KMS kernel-mode setting 395KPI kernel programming interface 396KVA kernel virtual address 397KVM kernel virtual memory 398KVM keyboard, video, mouse switch 399LAMP Linux Apache MySQL {Perl,PHP,Python} 400LAN local area network 401LAPIC local advanced programmable interrupt controller 402LBA logical block addressing 403LCD liquid crystal display 404LCP link control protocol 405LDAP lightweight directory access protocol 406LDT local descriptor table 407LE logical extent 408LED light emitting diode 409LF line feed 410LF low frequency 411LFM lowest frequency mode 412LFS log-structured file system 413LFU least frequently used 414LIFO last in first out 415LILO last in last out 416LILO Linux loader 417LINT local interrupt 418LIR local Internet registry 419LKM {Linux, loadable} kernel module 420LKML Linux kernel mailing list 421LL/SC load linked / store conditional 422LLC logical link control 423LLVM Low Level Virtual Machine 424LOC lines of code 425LPC low pin count 426LRC longitudinal redundancy check 427LRU least recently used 428LSB least significant bit [or: byte] 429LSB Linux standards base 430LSI large scale integration 431LTR left to right 432LTR load task register 433LUN logical unit number 434LV logical volume 435LVM logical volume management 436LVT local vector table 437LZW Lempel Ziv Welch 438MAC medium access control 439MAC mandatory access control 440MADT multiple APIC descriptor table 441MB megabyte 442MBR master boot record 443MBS megabits per second 444MC memory controller 445MCA machine check architecture 446MCC multiversion concurrency control 447MCE machine check exception 448MCGA multicolor graphics adapter 449MCH memory controller hub 450MCQ memory controlled queue 451MDA mail delivery agent 452MDA monochrome display adapter 453MDRAM multibank dynamic random access memory 454MFC merge from current 455MFM modified frequency modulation 456MIB management information base 457MID mobile internet device 458MIDI musical instrument digital interface 459MIF management information format 460MIMD multiple instruction stream, multiple data stream 461MIME multipurpose Internet mail extensions 462MIMO multiple input multiple output 463MIPS million instructions per second 464MISD multiple instruction, single data 465MIT Massachusetts Institute of Technology 466ML mailing list 467ML machine language 468ML machine learning 469ML markup language 470ML maximum likelihood 471MLC multi-level cell 472MMIO memory mapped input/output 473MMU memory management unit 474MMX multimedia extension 475MMX multiple math extension 476MMX matrix math extension 477MP multiprocessor 478MP multiprocessing 479MP multi-platform 480MP multiplayer 481MPEG moving picture experts group 482MPI message passing interface 483MPLS multiprotocol label switching 484MPP massively parallel processor 485MPS multiprocessor specification 486MPS memory pool system 487MRU most recently used 488MS Microsoft 489MSB most significant bit [or: byte] 490MSF minutes seconds frames 491MSI message signaled interrupt 492MSR machine state register 493MSS maximum segment size 494MT machine translation 495MTA mail transfer agent 496MTBF mean time between failures 497MTRR memory type range register 498MTTF mean time to failure 499MTU maximum transmission unit 500MUA mail user agent 501MVCC multiversion concurrency control 502MWE module width encoding 503MX mail exchange 504NACK negative acknowledgement 505NAN not a number 506NAS network attached storage 507NAT network address translation 508NAV network allocation vector 509NC numerical control 510NCP network control protocol 511NCQ native command queuing 512NFA nondeterministic finite automaton 513NFS network file system 514NIC network interface card 515NIS network information service 516NLS native language support 517NMI non-maskable interrupt 518NNTP network news transfer protocol 519NOP no operation 520NP nondeterministic polynomial time 521NRZ non-return to zero 522NSA National Security Agency 523NTM non-deterministic Turing machine 524NTP network time protocol 525NUMA non-uniform memory access 526NVRAM non-volatile random access memory 527NX no execute 528OAEP optimal asymmetric encryption padding 529OBO off by one 530OBOE off by one error 531OCL object constraint language 532OCR optical character recognition 533ODCM on-demand clock modulation 534OEM original equipment manufacturer 535OFDM orthogonal frequency division multiplexing 536ONFI open nand flash interface 537OO object oriented 538OO OpenOffice 539OOB out of band 540OOE out of order execution 541OOM out of memory 542OOP object oriented programming 543OOSE object oriented software engineering 544OQL object query language 545ORM object-relational mapping 546OS operating system 547OSD open source definition 548OSF open software foundation 549OSI open systems interconnection 550OSI open-source initiative 551OSPF open shortest path first 552OSS open source software 553OSS open sound system 554OSVW operating system visible workarounds 555OTP one time password 556OUI organizationally unique identifier 557OWL Web ontology language 558P2P peer to peer 559P2P PCI to PCI 560PA physical address 561PAE physical address extension 562PAM pluggable authentication modules 563PAM pulse amplitude modulation 564PAP password authentication protocol 565PAT page attribute table 566PAT port address translation 567PATA parallel ATA 568PAX portable archive exchange 569PBE pending break encoding 570PBE programming by example 571PC personal computer 572PCB printed circuit board 573PCC Portable C Compiler 574PCI peripheral component interconnect 575PCM pulse code modulation 576PCMCIA personal computer memory card international association 577PD public domain 578PDA personal digital assistant 579PDA pushdown automaton 580PDF portable document format 581PDN pull-down network 582PDP page descriptor page 583PDU protocol data unit 584PER packed encoding rules 585PERL practical extraction [and] report language 586PFS perfect forward secrecy 587PGP pretty good privacy 588PHB PCI host bridge 589PIC programmable interrupt controller 590PIC position independent code 591PID process id 592PIE position independent executable 593PIN personal identification number 594PIO programmed input/output 595PKI public key infrastructure 596PKCS public-key cryptography standards 597PLC programmable logic controller 598PLL phase locked loop 599PME power management event 600PMI platform management interrupt 601PMIO port-mapped input/output 602PMT photo-multiplier tube 603PNG portable network graphics 604PNP plug and play 605POE power over ethernet 606POP post office protocol 607POSIX portable operating system interface [for] Unix 608POST power on self test 609POTS plain old telephone system 610PPC PowerPC 611PPB PCI [to] PCI bridge 612PPI pixels per inch 613PPP point-to-point protocol 614PPPOA point-to-point protocol over ATM 615PPPOE point-to-point protocol over ethernet 616PPU physics processing unit 617PRBS pseudo-random bit sequence 618PRML partial response, maximum likelihood 619PRNG pseudo random number generator 620PROM programmable read only memory 621PSE page size extensions 622PSK pre-shared key 623PSTN public switched telephone network 624PSW program status word 625PTE page table entry 626PTLA pseudo top level aggregator 627PTP page table page 628PU processing unit 629PV physical volume 630PVG physical volume group 631PWM pulse width modulation 632PXE preboot execution environment 633QA quality assurance 634QAM quadrature amplitude modulation 635QOS quality of service 636RAD rapid application development 637RAID redundant array of inexpensive disks 638RAM random access memory 639RAS restartable atomic sequence 640RAS remote access service 641RAS row address strobe 642RC release candidate 643RC remote control 644RCS revision control system 645RCU read-copy-update 646RDF resource description format 647RDM relational data model 648RDMA remote direct memory access 649REST representational state transfer 650RGB red green blue 651RHL Red Hat Linux 652RIFF Resource Interchange File Format 653RIP routing information protocol 654RIR regional Internet registry 655RISC reduced instruction set computing 656RKM ROM Kernel Manual 657RLE run length encoding 658RLL run length limited 659RNG random number generator 660ROM read only memory 661RPC remote procedure call 662RPL requested privilege level 663RPM revolutions per minute 664RSA Rivest, Shamir and Adleman 665RSS really simple syndication 666RSS residual sum of squares 667RT real time 668RTC real time clock 669RTC real time computing 670RTF rich text format 671RTL resistor-transistor logic 672RTOS real time operating system 673RTS {ready, request} to send 674RTT round time trip 675RUP rational unified process 676RX receive, receiver 677S/PDIF Sony/Phillips digital interface 678SAAS software as a service 679SACD super audio compact disc 680SAD security association database 681SAM serial access memory 682SAN storage area network 683SAPIC streamlined advanced programmable interrupt controller 684SASI shugart associates system interface (predecessor to SCSI) 685SATA serial advanced technology attachment 686SB sound blaster 687SBU standard build unit 688SCM software configuration management 689SCM source code management 690SCP secure copy 691SCI system control interrupt 692SCI scalable coherent interface 693SCSI small computer system interface 694SCTP stream control transmission protocol 695SDK software development kit 696SDL simple declarative language 697SDRAM synchronous dynamic random access memory 698SDT syntax-directed translation 699SEGV segmentation violation 700SFI simple firmware interface 701SFC sequential function chart 702SGRAM synchronous graphics random access memory 703SIFS short inter-frame space 704SIMD single instruction, multiple data 705SIMM single inline memory module 706SIP session initiation protocol 707SIR slow infrared 708SISD single instruction, single data 709SLC single-level cell 710SLDRAM synchronous-link dynamic random access memory 711SLI scalable link interface 712SLI scan-line interleave 713SLOC source lines of code 714SMART self-monitoring analysis and reporting technology 715SMBIOS system management BIOS 716SMI system management interrupt 717SMI structure of management information 718SMM system management mode 719SMP symmetric multiprocessing 720SMT simultaneous multithreading 721SMTP simple mail transfer protocol 722SNMP simple network management protocol 723SOA service oriented architecture 724SOAP simple object access protocol 725SOHO small office / home office 726SOL serial over LAN 727SP stack pointer 728SP service pack 729SPARC scalable processor architecture 730SPARQL SPARQL protocol and RDF query language 731SPD security policy database 732SPD serial presence detect 733SPI serial peripheral interface 734SPI stateful packet inspection 735SPMD single process, multiple data 736SPR special purpose register 737SQL structured query language 738SRAM static random access memory 739SS stack segment 740SSD solid state drive 741SSE streaming SIMD extensions 742SSFDC solid state floppy disc card 743SSH secure shell 744SSI server side includes 745SSL secure sockets layer 746SSP stack smashing protection 747STP shielded twisted pair 748STP spanning-tree protocol 749SUS Single Unix Specification 750SVG scalable vector graphics 751SVGA super video graphics {array,adapter} 752SVM secure virtual machine 753SVM support vector machine 754SWF Shockwave Flash 755TAS test and set 756TAO track at once 757TCB trusted computing base 758TCC thermal control circuit 759TCL tool command language 760TCP transmission control protocol 761TCQ tagged command queueing 762TDD test driven development 763TDP thermal design power 764TECO Text Editor and Corrector 765TFT thin film transistor 766TFTP trivial file transfer protocol 767TIAS try it and see 768TIFF tagged image file format 769TITS try it to see 770TLA top level aggregator 771TLB transition lookaside buffer 772TLD top level domain 773TLS transport layer security 774TLS thread local storage 775TM Turing machine 776TMDS transition minimized differential signaling 777TMO timeout 778TOS terms of service 779TOS type of service 780TP transaction processing 781TPM trusted platform module 782TPR task priority register 783TR token ring 784TR task register 785TRNG true random number generator 786TS time stamp 787TS time series 788TS terminal services 789TSC time stamp counter 790TSO time sharing option 791TSP time stamp protocol 792TSP tunnel setup protocol 793TSP traveling salesman problem 794TSS task state segment 795TTL time to live 796TTL transistor-transistor logic 797TTM translation table maps 798TTY teletype 799TX transmit out, transmitter 800TZ time zone 801UAC user {account, access} control 802UART universal asynchronous receiver/transmitter 803UC uncacheable 804UCS uniform-cost search 805UDMA ultra DMA 806UDO ultra density optical (storage) 807UDP user datagram protocol 808UFS Unix file system 809UI user interface 810UI unit interval 811UID user identifier 812UID unique identifier 813UL upload 814UMA uniform memory access 815UMA upper memory area 816UMB upper memory block 817UML unified modeling language 818UPS uninterruptible power supply 819URI uniform resource identifier 820URL uniform resource locator 821URN uniform resource name 822USART universal synchronous/asynchronous receiver/transmitter 823USB universal serial bus 824USWC uncacheable speculative write combining 825UTC coordinated universal time 826UTP unshielded twisted pair 827UUCP Unix-to-Unix copy protocol 828UUID universally unique identifier 829UUOC useless use of cat 830VA virtual address 831VA vertical alignment 832VAX virtual address extension 833VCC common collector voltage 834VCM virtual channel memory 835VESA video electronics standards association 836VG volume group 837VGA video graphics {array,adapter} 838VHDCI very high density cable interconnect 839VID voltage level identifier 840VLAN virtual local area network 841VLIW very long instruction word 842VLSI very large scale integration 843VLSM variable length subnet mask 844VM virtual {machine,memory} 845VMX virtual machine extensions 846VMX vector multimedia extensions 847VPN virtual private network 848VR virtual reality 849VRAM video random access memory 850VRRP virtual router redundancy protocol 851W3C World Wide Web Consortium 852WAN wide area network 853WAP wireless application protocol 854WEP wired equivalent privacy 855WFI wait for interrupt 856WIFI wireless fidelity 857WLAN wireless local area network 858WDT watchdog timer 859WOL wake on LAN 860WOR wake on ring 861WORM write once read many 862WPA wi-fi protected access 863WRAM window random access memory 864WWAN wireless wide area network 865WWW world wide web 866WYSIWYG what you see is what you get 867XBAR crossbar 868XER XML encoding rules 869XGA extended graphics {array,adapter} 870XIP execute in place 871XML extensible markup language 872XOR exclusive or 873XP extreme programming 874XSL extensible stylesheet language 875XSS cross site scripting 876XT extended technology 877XUL XML user interface language 878YACC yet another compiler compiler 879YAWPFAPR you are welcome; please file a problem report 880YP yellow pages (aka NIS) 881ZFOD zero-filled on demand 882ZIF zero insertion force 883ZIFS zero insertion force socket 884ZMA zone multicast address 885