| bare metal | barf | barfulation |
| barfulous | barney | Baroque |
| baroque | baseband | bash |
| BASIC AUTOCODER | BASIC V | bathtub curve |
| baz | BBC Microcomputer | BC |
| BCL | BC NELIAC | BCNU |
| BEA | Bedrock | BELL |
| Bell Communications Research, Inc | Bell Laboratories | bells, whistles, and gongs |
| Berkeley EDIF200 | Berkeley Network | berklix |
| Bernoulli principle | Bertrand | Bertrand Meyer |
| BETA | beta | beta abstraction |
| beta reduction | BiCapitalisation | bi-endian |
| BIFF | biff | Big bag of pages |
| BIG-LAN | bigot | binary exponential backoff |
| binary tree | BIOR | BIP |
| BIPS | Birds Of a Feather | BISDN |
| Bison++ | bit bang | bit bashing |
| bitblt | bit twiddling | bitwise complement |
| bixie | BJC4000 | black art |
| black hole | blargh | blast |
| blat | BLAZE | BLAZE 2 |
| bletcherous | B-LINE | blinkenlights |
| blit | blivet | Bloggs Family, the |
| Blosim | blow an EPROM | blow past |
| BLOX | BLT | Blue |
| blue wire | blurgle | BMASF |
| BNF | BNR Pascal | BNR Prolog |
| boa | board | boat anchor |
| Bob | Boehm B. | bogon |
| bogon filter | bogon flux | bogosity |
| bogue out | boink | bondage-and-discipline language |
| bonk/oif | Bookreader | Bookviewer |
| Booster | BOOTP | boot virus |
| BOSS | bottom-unique | bounce |
| bounce message | boundary scan | bound variable |
| bournebasic | boxen | brain-damaged |
| brain-dead | brain dump | branch to Fishkill |
| Brazil | break | break-even point |
| breath-of-life packet | BRIDGE | Brilliant |
| bring X to its knees | broadcast | broken |
| brouter | BRUIN | BUAF |
| BUAG | bubble memory | bubble sort |
| bucky bits | buffer | bug-compatible |
| bug-for-bug compatible | buglix | built-in |
| Built-in Self Test | bum | bump |
| burble | Burge's Language | buried treasure |
| Butterfly Common LISP | Butterfly Scheme | buzz |
| bwBASIC | BWQ | by hand |
| CAD/CAM | CADET | CAFE |
| CAGE | CAIS-A | CAiSE |
| Calculus of Communicating Systems | Calendar Application Programming Interface | Caliban |
| California State University San Marcos | call-by-value | call-by-value-result |
| CALS | CAM-6 | Cambridge Lisp |
| CAMIL | Caml Light | Campus Wide Information System |
| Canada | Candle | canonical name |
| Captain Abstraction | cardinal number | CARDS |
| careware | CAS 8051 Assembler | CASE Data Interchange Format |
| CASE framework | CASE*Method | CASE SOAP III |
| CASE tools | casters-up mode | CAT |
| CATO | CBASIC | C Beautifier |
| C/C++ | CCalc | CCIRN |
| CCITT | CCL | CCLU |
| ccmail | CCR | CCTA |
| CDE | CDL | cd tilde |
| Cecil | Cedar | CEEMAC+ |
| CEI-PACT | Cellang | Centrum voor Wiskunde en Informatica |
| cforth | CFP | CHIP-48 |
| C-Interp | CIP Language | CIRcuit CALculus |
| CML | COMMEN | Compas Pascal |
| COMPASS | Compiler-Compiler | compiler-compiler |
| compiler jock | Compiler Language for Information Processing | Compiler Target Language |
| complete | complete graph | complete lattice |
| Complex Instruction Set Computer | complexity analysis | COMPREHENSIVE |
| COMPROSL | Compu$erve | Compulink Information eXchange |
| Compusult Ltd. | Computational Adequacy Theorem | COMTRAN |
| CORAL | CORAL 66 | CORC |
| core gateway | corge | Cornell List Processor |
| Cornell Theory Center | Coroutine Pascal | Corporation for Open Systems |
| CORREGATE | Correlatives and Conversions | Cortex |
| CORTL | COSE | COSINE |
| cosmic rays | cowboy | COWSEL |
| CP | CPL | CPS |
| CPU Wars | crank | CrApTeX |
| crash | Cray instability | crayola |
| crayon | creationism | creeping elegance |
| C-Refine | CREW PRAM | crippleware |
| Crisis Software | CRISP | crisp |
| critical mass | critical section | CRL |
| crock | cross-assembler | cross-post |
| cross software | CROSSTABS | CROW PRAM |
| crudware | cryptanalysis | Crypt Breakers Workbench |
| Crystal | CS-4 | C++SIM |
| CSL | CSM | CSMA/CD |
| CSNET | CSO | CSP/80 |
| CS/PCode | CS-Prolog | CSPS |
| CSP-S | CS/QCode | CSSA |
| CSS/II | CSTools | CTY |
| Cube | cube | CUCH |
| Culler-Fried System | CUPID | CUPL |
| curly bracket | currying | curseperl |
| curses | CUSI | cuspy |
| custom | cut a tape | CWIC |
| C with Classes | Cy486SLC | cyberpunk |
| CYBIL | CYCL | cycle drought |
| cycle of reincarnation | D | DAA |
| DACAPO | DACNOS | DACTL |
| Daisy | DAISY 201 | DANTE |
| DAP Fortran | DAPLEX | DARE |
| DAS | DASL | database manager |
| database server | DATABUS | Datacom |
| data driven | Data Encryption Algorithm | Data Encryption Key |
| Data Encryption Standard | datagram | data hierarchy |
| Datamation | DataViews | DataVis |
| DAU | DAZIX | dBXL |
| DCA | DCALGOL | DCDL |
| DCL | D. C. Power Lab | dd |
| DDCMP | DDE Manager | DDIF |
| DDT | DEACON | dead |
| death code | Death Star | decay |
| DECdesign | DECdns | DEChead |
| decision support | decision support database | deckle |
| DECnet | Decus cpp | DEC Wars |
| DECwindows | DECwrite | DED |
| deep magic | deep space | de facto standard |
| Defense Communications Agency | Defense Data Network | Defense Data Network Network Information Center |
| Defense Information Systems Agency | deferral | degree |
| dehose | delint | Delirium |
| delta | Delta-4 | Delta-Prolog |
| DELTASE | demand driven | DeMarco |
| demented | Demeter | demo |
| demo version | depeditate | deprecated |
| descent function | Descriptive Top-Level Specification | Design System language |
| desktop manager | DESQview | DESY |
| DETAB | development | devo |
| DEX | DFA | DFC |
| DGL | DG/L | DIALOG |
| dialup | DIAMAG | diameter |
| Diamond | DIBOL | dictionary flame |
| diff | digest | Digicom |
| digit | Digital Express Group, Inc. | Digital Library Initiative |
| Digital Signal Processing | DIGITAL Standard MUMPS | dike |
| DIN | ding | dink |
| DinnerBell | DINO | dinosaur |
| dinosaur pen | Direct Connection | directed acyclic graph |
| directed graph | Directory Access Protocol | Directory System Agent |
| Directory User Agent | dirtball | dirty power |
| disjoint union | Disjunctive Normal Form | Display PostScript |
| Dissociated Press | Distributed Computing Environment | distributed database |
| Distributed Eiffel | Distributed Management Environment | Distributed Operating Multi Access Interactive Network |
| Distributed Processes | Distributed Smalltalk | distributed system |
| diverge | divisor | DL/1 |
| DLCI | DLG | DL/I |
| DLM | DMAD | dmake |
| DMALGOL | DNS | doc |
| Document Image Processing | Document Style Semantics and Specification Language | DOCUS |
| DoD-1 | dodgy | DOE |
| dogcow | dogpile | dogwash |
| DOL | DOMF | dongle-disk |
| donuts | doorstop | DOS Protected Mode Interface |
| dot address | dotted quad | double bucky |
| doubled sig | DOW COMPILER | down |
| DP | DPB | DPer |
| dpi | DPL | DPL-82 |
| dpSather | draco | drag and drop |
| DRAGON | dragon | Drawing eXchange Format |
| DRECNET | DRM | drop cable |
| drop-ins | drop on the floor | drop-outs |
| DRUCO I | drugged | drum |
| drunk mouse syndrome | DSE | DSM |
| DSP32 Assembly Language | DSP56000 | DSP56001 |
| dsp56165-gcc | dsp56k-gcc | DSP/C |
| DSS | DST | DTALGOL |
| dual-attached | dual ported | Duff's device |
| dumpster diving | dup killer | Duplex High Speed Data |
| Durra | dusty deck | dweeb |
| DWIM | Dylperl | dynamic adaptive routing |
| dynamic binding | DYNAMO | DYSAC |
| DYSTAL | eager evaluation | Eagle |
| EAROM | earthquake | Ease |
| EASE II | EASIAC | EAST |
| Eastern Washington University | EASY FOX | Ebone |
| EC++ | ECAP II | Echidna |
| echo | echo cancellation | ECHT |
| ECIP2 | ECLIPSE | ECMA |
| Econet | ECOOP | ECP |
| ECRC-Prolog | ECSL | ECSP |
| ECSS II | ECSSL | EDA |
| EDIF | EDIFACT | Edinburgh Prolog |
| Edinburgh SML | Edison | EEPROM |
| EER | Eh | EHTS |
| Eiffel source checker | EL1 | el(alpha) |
| Elan | elder days | elegant |
| elephant | elephantine | elevator controller |
| ELF | ELLA | Ellemtel |
| ELLIS | ELMAMETA | ELP |
| EMA | EMDIR | Emerald |
| Emitter Coupled Logic | EML | Empty Nest |
| emulator | EMX | Encapsulated PostScript |
| encapsulation | Enhanced Dynamic Random Access Memory | Ente Nazionale Italiano di Unificazione |
| Envoy | EOF | EOL |
| EOUG | EPILOG | EPROS |
| EPSIMONE | EqL | EQLOG |
| EQLog | Eqn | Equel |
| era | ERCIM | EREW PRAM |
| ERFPI | ergonomic | ergonomics |
| Eris | ESF | ESI |
| esim | ESL | ESLPDPRO |
| ESP | Estelle | Esterel |
| EstPC | ET | ET++ |
| EtherGate | Ethernet meltdown | Eudora |
| EULER | EuLisp | EUnet Ltd. |
| Euphoria | Eureka | Eureka step |
| Eurocard | Euro-ISDN | EuropaNET |
| European Committee for Standardization | Eva | evolutionary algorithm |
| evolutionary computation | evolutionary programming | evolution strategy |
| examining the entrails | EXAPT | Excelan |
| Excelerator | exception | exception handler |
| EXE | exercise, left as an | eXodus |
| EXOS | explicit parallelism | Exploratory Data Analysis |
| Express | Extended Fortran Language | Extended ML |
| Extended Pascal | Extended Tiny | extensional |
| extensional equality | eXternal Data Representation | EXTRA |
| EZ | f2c | F68K |
| FAC | factor | FAD |
| failure | FALSE | faradise |
| FARNET | fas | FASBOL |
| FASE | F-code | FCP |
| fdlibm | fear and loathing | feature creature |
| featurectomy | Federal Geographic Data Committee | Federal Networking Council |
| feed-forward | Feel | feep |
| feeper | feeping creature | feeping creaturism |
| FEL | fence | fencepost error |
| Fetch | ffccc | FFP |
| FGHC | FGL | FGL+LV |
| FGRAAL | Fiber Distributed Data Interface | FIDIL |
| field circus | Fifth | File Attach |
| File Composition | File Request | file server |
| file signature | File Transfer Protocol | filk |
| filter | firefighting | fireworks mode |
| Firmware | first generation language | first-order |
| FITNR | FITS | flaky |
| FLAP | flarp | flat |
| flatten | Fleng | Flex++ |
| flib | FLIC | FLIP |
| F-Logic | FLOP | FLOPS |
| FLOW-MATIC or FLOWMATIC | FLPL | FMQ |
| FMS | FNAL | FOAF |
| FOCAL | FOCL | FOD |
| FOIL | followup | fontology |
| foogol | FOOL | Fools' Lisp |
| Foonly | FOOP | FORC |
| Force | ForceOne | ForceTwo |
| foreground | for free | FORMAC |
| FORMAL | Formula ALGOL | Forsythe |
| Fortran 66 | Fortran 77 | Fortran 90 |
| Fortran D | Fortran I | Fortran II |
| Fortran III | Fortran IV | Fortran-Linda |
| Fortran M | Fortran-Plus | Fortran V |
| Fortran VI | FORTRUNCIBLE | fortune cookie |
| forward analysis | forward chaining | forward delta |
| FORWISS | For Your Information | fossil |
| foundation | four-colour glossies | FP2 |
| fpc | frame pointer | framework |
| Framework 4 | framing specification | FRANK |
| FRED | fred | frednet |
| free | FreeHEP | Freenet |
| freerexx | free variable | freeze |
| Friend | FRINGE | frink |
| fritterware | FRL | FRMT-FTRN |
| frob | frobnicate | frobnitz |
| frogging | Frolic | front end |
| front-end processor | fry | FSL |
| fsplit | FTAM | FTP by mail |
| FTTP | fudge | fudge factor |
| FUDGIT | FUD wars | Fuel-can |
| full-custom | fully lazy lambda lifting | Fun |
| functional | functional unit | function application |
| functor | funky | FUNLOG |
| FunnelWeb | funny money | FUSE |
| FUSION | fuzzball | fuzzy logic |
| fuzzy subset | fweep | FWIW |
| FX-87 | FYA | FYI4 |
| G2 | gabriel | GADS |
| Gaelic | gag | GAIA |
| Galileo | gamut | GAN |
| GANDALF | gang bang | GAPLog |
| Gargoyle | Garnet | GARP |
| garply | GAT | GATE |
| gated | GC | GCL |
| G-Code | GDMO | GDPL |
| GEA | GEANT | Gedanken |
| gedanken | geef | geek out |
| GEI | General Magic | General Protection Failure |
| General Purpose Graphic Language | General Purpose Language | generate |
| generation | Genesia | genetic algorithm |
| GENOVA | Gentleman's Portable Coroutine System | GEN-X |
| Geographical Information System | GEOS | GEPURS |
| Gerald | ghostview | GIFF |
| GIM-1 | GIN | GINA |
| Ginger | GIP | GIPS |
| GIRL | GKS-3D | GL |
| Glammar | glark | GLASS |
| glass | glassfet | glass tty |
| Glish | Glisp | glitch |
| Global Network Navigator | glork | Glypnir |
| GMD Toolbox for Compiler Construction | GNU assembler | GNU BC |
| GNU DC | GNU E | GNUMACS |
| GNU Privacy Guard | GNU superoptimiser | go flatline |
| GOL | golden | GOM |
| gonkulator | Gopher object type | gorets |
| gorilla arm | go root | gorp |
| GOSMACS | Gosperism | GOSPL |
| GP | GPF | GPL |
| GPSS | GPX | GRAAL |
| GRAF | Graffiti | GRAIL |
| GRAIN | GRAM | grammatical inference |
| Grapes | Grapevine | Graphic Language |
| graph reduction | graph rewriting system | GRAPPLE |
| GRAS | GRASP/Ada | GRASPIN |
| grault | Gray | Great Runes |
| Green Book CD-ROM | green card | green lightning |
| green machine | GRG | GRIB |
| grick | grilf | GRIND |
| grind | grind crank | GRIP |
| gripenet | gritch | grix |
| groff | grok | gronk |
| gronked | group | grovel |
| grunge | GSL | Guide |
| guiltware | gunch | GVL |
| GW-Ada | gweep | GWM |
| Gypsy | h | hacker humour |
| Hacking X for Y | hack on | hack value |
| ha ha only serious | hair | HALMAT |
| halting problem | hammer | handshaking |
| handwave | hang | happily |
| hardwarily | Harvest C | has the X nature |
| hat | Hayes | HBOOK |
| hc | HCI | HCLP |
| HCPRVR | HCS | HDFL |
| header | head normalisation theorem | heads down |
| heavyweight | heavy wizardry | Helen Keller mode |
| Helix | HEP | HEPDB |
| HEPiX | HEPnet | HEPVM |
| HEQS | HERA | heterogeneous |
| Hewlett-Packard | Hewlett Packard Precision Architecture | Hewlett-Packard Visual Engineering Environment |
| HHOK | hidden flag | hierarchy |
| high bit | Higher Education National Software Archive | high-level language |
| high moby | High Performance Computing and Communications | HIGZ |
| HiLog | hing | HINT |
| HiPAC | hirsute | HISTORIAN |
| HLISP | Hobbit | hobbit |
| HOL | HOL-88 | HOL-90 |
| HOL-UNITY | holy wars | home machine |
| HOOK | horizontal application | hose |
| HOS-STPL | hostname | hotlink |
| hot spot | HOTT | house wizard |
| HPcode | HPCode-Plus | HP-GL/2 |
| HPL | HPLOT | HTLM |
| HTTL | HTTP/1.0 | HUGO |
| Human Interface Technology Laboratory | hung | hungry puppy |
| Hybrid | Hyper-C | HyperCard |
| hypercube | Hyper-Man | HyperNeWS |
| Hyperscript | hyperspace | Hyperstrict |
| HyperTalk | hysterical reasons | HyTime |
| IAD | IAM | I-APL |
| IAR | IBM 801 | IBM discount |
| Iburg | I-CASE | ICES |
| ICETRAN | Iconicode | IC-Prolog |
| ICSI | ICWS | IDAMS |
| IDEAL | IDEF | idempotent |
| I didn't change anything! | Id Nouveau | IDOL |
| IDS/I | IEEE 1076 | IEEE 802.2 |
| IEEE 802.5 | IFAC | ifdef out |
| IFIP | IFX | IGES |
| IGL | IITRAN | ILISP |
| ill-behaved | ILLIAC | ILOC |
| Ilog Solver | Imago Europe plc | Imago On-line |
| imake | incantation | include |
| include war | incremental constraint solver | inductive relation |
| inference engine | INFN | Infobahn |
| Info BASIC | Information Algebra | Information Builders |
| Information Innovation | Information Management | Information Processing Language |
| Information Resource Management | Information Systems Factory | Information Technology Infrastructure Library |
| Informix | INGRES | InnovAda |
| inode | insanely great | INSIGHT |
| Institute for Global Communications | Institute of Electrical and Electronics Engineers, Inc. | Integrated Systems Architecture |
| Intel Literature Sales | INTERACTIVE | Interactive CourseWare |
| Interactive Data Language | Interagency Interim National Research and Education Network | InterBase |
| Interest Group in Pure and Applied Logics | interesting | Interface Architect |
| Interface Definition Language | Interface Description Language | Interlan |
| Interleaf | INTERLINK | Interlisp-10 |
| Intermedia Interchange Format | Internet Architecture Board | Internet-Draft |
| Internet Engineering and Planning Group | Internet Engineering Steering Group | Internet Experiment Note |
| Internet Express | Internet Monthly Report | Internet Public Library |
| Internet Registry | Internet Research Task Force | internetworking |
| Internex On-Line | interoperability | interoperable database |
| Interpress | interrupt list | interrupt priority level |
| interrupt request | InterViews | I-OOA |
| IPL | IPS | IQ |
| IQL | IRDS | Iris |
| iron | iron box | Ironman |
| ironmonger | irrefutable | ISDE |
| ISEE | ISETL | ISIS |
| ISL | ISLisp | ISMAP |
| ISO 9000 | ISO Development Environment | ISO Pascal |
| ISPL | ISPS | ISV |
| ITS | Ivan | Ivan Sutherland |
| Iverson's Language | ivs | IVTRAN |
| IVY | IWBNI | IYFEG |
| J | J3 | J73 |
| jack in | JAD | Jade |
| JaM | jam | Janus |
| JFCL | jiffy | jitter |
| jock | joe code | Joint Academic NETwork |
| Joyce | JPLDIS | JRL |
| JTC1/SC24 | JTS | juggling eggs |
| Jughead | jump off into never-never land | jump trace buffer |
| Juno | jupiter | Jym |
| K5 | Kali | KAP |
| Karel | KBMS | KEE |
| Keldysh Institute of Applied Mathematics | ken | KeyNote Software |
| keypal | keyword | Khornerstone |
| KIBO | kiboze | kick |
| Kid | killer micro | killer poke |
| kill file | kiosk | KIPS |
| KISS | KISS Principle | KL0 |
| KL1 | Klerer-May System | klone |
| KL-ONE | KMODEL | Knights of the Lambda-Calculus |
| Knowledge Management System | knowledge representation | Knowledge Systems Laboratory |
| Knuth | Korn Shell | kremvax |
| KRL | L6 | Lab for Computer Science |
| LaborNet | Lace | lace card |
| Lakota | LAMBDA | lambda abstraction |
| lambda lifting | LAMINA | LANCE |
| Language H | language lawyer | Language Sensitive Editor |
| language-sensitive editor | languages of choice | LANL |
| LAP | LAP4 | LAPD |
| Larch | Larch/C++ | Large Installation Systems Administration |
| larval stage | lase | latch |
| LAU | LAVA | LAX |
| lazy list | lazy sml2c | LBL |
| LCC | LCL | LDB |
| LDL | LDL1 | LDT |
| LE/1 | Leaf Distribution Limited | leaf site |
| Lean | LEAP | leapfrog attack |
| least recently used | LECOM | LeFun |
| legal | legalese | LEGOL |
| Le-Lisp | Lempel-Ziv Welch compression | LERP |
| LEVEL5 OBJECT | level-sensitive scan design | LG |
| LGDF | LGEN | LIDO |
| LiE | LIFIA | LIGHT |
| like this | Lila | Lily |
| LIMDEP | LIMP | Lincoln Reckoner |
| linear address space | linear function | Linear Graph Notation |
| line probing | line starve | Lingo |
| LINGOL | Link Access Procedure on the D channel | Link Access Protocol for Modems |
| link-dead | LINPACK | lint |
| Linux Network Administrators' Guide | LIPL | LIS |
| LISP 1 | LISP 1.5 | LISP 2 |
| LISP70 | LISP A | Lispkit Lisp |
| Lisp-Linda | Lisp Object-Oriented Programming System | LISP, Objects, and Symbolic Programming |
| Lisptalk | LispView | Listproc |
| Liszt | literature | LITHE |
| lithium lick | LITTLE | Little Smalltalk |
| live data | Live Free Or Die! | liveware |
| LLM3 | LM3 | LML |
| LM-Prolog | LNF | LO |
| L&O | load | lobotomy |
| locality | local loopback addresses | locals |
| locked and loaded | locked up | Locus |
| LogC | logical | logical relation |
| logic emulator | logic gate | Logic Replacement Technology |
| LOGIN | LOGISCOPE | LOGLISP |
| LOGOL | LOOK | Looking Glass |
| LOOKS | loop combination | loose bytes |
| LOP | lord high fixer | Lore |
| lost in the noise | LOTIS | lots of MIPS but no I/O |
| Lotus Notes | Lout | low-bandwidth |
| LPG | LPL | lpr |
| LPS | LPT | LRLTRAN |
| LSB | LSL | L-Soft |
| LSYD | LT-2 | LTR |
| LTR3 | LUCID | lump uncurrying |
| lunatic fringe | LUSTRE | LYaPAS |
| LYNX | Lynx | LynxOS |
| Lynx Real-Time Systems | LYRIC | LZ77 compression |
| LZ78 compression | lzexe | m2 |
| M2toM3 | M3 | m4 |
| M5 | MAC | MAC-360 |
| MAC address | MACAnalyst | Macaulay |
| MACDesigner | macdink | MACE |
| Mach | Machiavelli | machinable |
| machine | MAchine INdependent SAIL | machine learning |
| machoflops | Macintoy | Macintrash |
| MACL | MACRO | macro |
| macro- | macrology | Macro SAP |
| MACSYMA | MacX | Madaline |
| MADCAP | MADTRAN | MAGIC |
| magic | magic cookie | Magic Paper |
| Magic Switch Story | MAGNUM | Magritte |
| Maisie | Makedoc | makefile |
| Maker Interchange Format | MALI | malloc |
| management | manged | mangle |
| mangler | manularity | MAO |
| Maple | Maril | marketroid |
| Markov | Markowitz | mark-sweep garbage collection |
| Mars | MARSYAS | Martian |
| Martin Marietta Laboratories Moorestown | MARVIN | MAS |
| MASCOT | MASM | MasPar Unity |
| Massachusetts Institute of Technology | massage | Massively Multiplayer Online Game |
| Matchmaker | Mathcad | Mathematical Analysis without Programming |
| MATHLAB | MATH-MATIC or MATHMATIC | math-out |
| Matrix | Matrix Compiler | maximal free expression |
| MAXIMOP | Maxis Software | MBASIC |
| Mbogo, Dr. Fred | MBONE | MCC |
| McG360 | MCP-1600 | mcvax |
| MDL | meatware | MegaHertz |
| megapenny | MEGO | MELD |
| MELDC | Melinda | member function |
| MENTOR | menuitis | MENYMA/S |
| Mercury Autocode | MERISE | Mesa |
| message | message passing | mess-dos |
| META 5 | MetaCard | Meta-CASE tool |
| METAFONT | Meta-II | METAL |
| metalanguage | metaprogram | Met-English |
| METEOR | me too | M-expression LISP |
| MFC | MIB Variable | Mic-1 |
| Mic-2 | microarray | microcentury |
| Microcom Networking Protocol | microcomputer | MicroDroid |
| MicroEmacs | microfloppies | microfortnight |
| microLenat | Micro ML | Micronetics Standard MUMPS |
| microPLANNER | microReid | Microware Corporation |
| MIDAS | Midas | middleware |
| MILITRAN | milliLampson | MILNET |
| mimencode | MIMOLA | Minerva software |
| Mini-ML | Mini PL/I | MINITAB II |
| MINUIT | minus | minus infinity |
| MIPS R2010 | MIPS R3000 | MIPS R4000 |
| Miracula | misbug | misfeature |
| miswart | MIX | MIXAL |
| MIX Communications | ML-2000 | MLAB |
| MLISP | ML Kit | MLL |
| ML-lex | ML-Linda | ML Threads |
| ML-Twig | Mma | mmap |
| MML | MOBSSL-UAF | mockingbird |
| Mock Lisp | modal | MODCAL |
| mode bit | MODEF | MODEM7 |
| moderator | MODSIM II | Modula-2* |
| Modula-2+ | Modula-3 | Modula-3* |
| Modula-3pi | Modula-P | Modula-Prolog |
| Modula/R | Modular C | Modular Prolog |
| Modulex | molly-guard | monitor |
| monkey up | monoid | monotonic |
| Montage | Moof | Moore bound |
| Moore graph | Mops | MORAL |
| MORTRAN | Moscow ML | Mosiac |
| Most Significant Bit | Motif | Motorola 68050 |
| Motorola 88000 | Mouse | mouse ahead |
| mouse around | MP-1 | MPL II |
| M-Prolog | MPS III | MPSX |
| MPV | MRS | mtc |
| Muddle | muFP | mu-law |
| Mul-T | MultiCal System | multicast addressing |
| multicast backbone | Multi-Garnet | multihomed host |
| multilayer perceptron | Multimedia Internet Mail Extensions | Multi-Pascal |
| Multiple Instruction/Multiple Data | Multiplexor Channel | MultiScheme |
| mumblage | mumble | munch |
| munching | munching squares | munchkin |
| mung | munge | museum |
| mutter | N10 | NAG |
| nailed to the wall | naive | naive user |
| nano- | nanotechnology | Napier |
| NAPLPS | NAPSS | nasal demons |
| NASTRAN | National Information Services and Systems | National Research and Education Network |
| National Science Foundation Network | National Software Reuse Directory | National Spatial Data Infrastructure |
| Native Language System | NATURAL | Natural English |
| Natural Language Information Analysis Method | Nawk | NBS |
| NCS | neat hack | neep-neep |
| negation by failure | NELIAC | Neon |
| neophilia | Neptune | NERECO |
| NetBEUI | NetBIOS | NetBOLLIX |
| netCDF | Netfind | NETL |
| netload | Netmarq Limited | netnews |
| net.personality | net.police | netrock |
| netter | Network Definition Language | Network extensible Window System |
| Network Information Center | Network News Transfer Protocol | Network Operations Center |
| Network Termination | Network Time Protocol | Neutral Interconnect |
| New Flavors | newgroup wars | New Jersey |
| NeWS | NewsClip | Newspeak |
| Newsqueak | New Testament | Newton |
| NewWave | NewYacc | New York State Educational Reasearch ETwork |
| New York University | Nexpert Object | NFQL |
| NFT | NGL | NIAL |
| NIAL Systems Ltd. | NIAM | NICE |
| nick | nickle | NICOL I |
| Nightmare File System | NIH | NIHCL |
| NIKL | NIL | NISO |
| NJCL | NODAL | Nodal Switching System |
| noddy | node | NOMEX underwear |
| nondeterministic | nonlinear | Non-Maskable Interrupt |
| non-optimal solution | Nonpareil | nontrivial |
| non-uniform quantising logarithmic compression | no-op | NOR |
| NORC COMPILER | NorCroft | NORD PL |
| normal order reduction | NorthWestNet | NoteCards |
| Nother | not ready for prime time | NPL |
| NPPL | N-Prolog | NQS |
| Nqthm | NSE | NT |
| NuBus | nu-calculus | NUCLEOL |
| nude | nuke | numbers |
| Numeris | Nuprl | NU-Prolog |
| Nu Thena | NYU OMNIFAX | O2 |
| OATH | Ob- | OBDC |
| Oberon-V | OBJ | OBJ0 |
| OBJ2 | ObjectCenter | Object CHILL |
| object code | Object Compatibility Standard | Objective PASCAL |
| ObjectLOGO | Object management system | Object Oberon |
| Objectworks | Object Z | Objlog |
| OBJT | ObjVlisp | ObjVProlog |
| Obliq | OBSCURE | observational equivalence |
| OCAL | OCODE | ODA |
| Ode | off-side rule | off the trolley |
| OIL | OLDAS | old fart |
| Old Testament | OLGA | O-Logic |
| OMA | Omega-algebraic | Omega test |
| OMF | OMNICODE | OMNIFAX |
| OMNITAB | OMTool | Ondine |
| one-line fix | ones complement | On-Line Computer system |
| OnX | OOGL | OOPS |
| OOPSLA | OOSD | OOZE |
| Opal | Open Distributed System Architecture | Open Network Computing |
| Open Scripting Architecture | Open Search | open switch |
| OPS83 | Optical Time Domain Reflectometry | optimise |
| optimism | OPTRAN | Oracle*CASE |
| Orbit | Orca | OREGANO |
| O'Reilly and Associates | Orwell | OS/2 |
| OSA extension | OSCAR | OSSL |
| OTT | overrun | overrun screw |
| Owl | Oz | oz |
| P+ | p2c | P3L |
| P4 | PACE | packet |
| Packet Assembler/Disassembler | Packet Switch Node | PACT I |
| PACTOLUS | padded cell | Paddle |
| PAGE | Page Description Language | PAISley |
| PANON | Pansophic | Paper Feed Control Character |
| PARADE | PARADIGM PLUS | Paradigms of AI Programming |
| Paradise | Paradox Application Language | Paragon |
| Paralation | Paralation C | Paralation LISP |
| ParAlfl | Parallel Presence Detect | parallel reduction |
| Parallel SML | parameter RAM | parametric polymorphism |
| paraML | ParaSoft Corp | Parasol |
| parentheses | Paris | Parkinson's Law of Data |
| Park-Miller | Parlance | Parlog |
| Parlog++ | parm | PARMACS |
| ParMod | parser generator | Parsley |
| Partial Differential Equation LANguage | partial equivalence relation | partial function |
| PARTS | PARULEL | Pascal- |
| Pascal-80 | Pascal+CSP | Pascal-F |
| Pascal-FC | Pascal/L | Pascal-Linda |
| Pascal-m | Pascal P4 | Pascal/R |
| Pascal-S | Pascal-SC | pasos2 |
| Pasqual | PASSIM | pastie |
| patch space | PATCHY | pathological |
| Path Pascal | pattern matching | PAW++ |
| payware | PBM | pC++ |
| PCF | PC-ism | PCL |
| PCLIPS | PC Pursuit | PC-Scheme |
| PCS/Geneva | PCTE+ | PC-ware |
| PDC Prolog | PDEL | pdksh |
| PDL | PDM | PDP-11 |
| PDP-20 | PDSA cycle | PDS/MaGen |
| PeaceNet | Pebble | Pebbleman |
| PECOS | Pedagogic Algorithmic Language | PEEK |
| PEEL | PENCIL | pencil and paper |
| PEPsy | percent | perceptron |
| perfect programmer syndrome | perl-byacc | perplexity |
| person of no account | pessimal | pessimising compiler |
| PEX | phage | phase |
| phase of the moon | phase-wrapping | philosophy |
| PHOCUS | phone phreaking | phreak |
| PICL | PicTeX | Pictorial Janus |
| PIE | piggybacking | pig, run like a |
| PIL | PIL/I | PILOT |
| Pilot European Image Processing Archive | PIM | Pine |
| PIRL | pistol | PIT |
| PITA | pixmap | pizza box |
| PL360 | PL516 | PL.8 |
| PLACE | PLAGO | plaid screen |
| PLAIN | plain ASCII | Planet |
| PLANIT | PLANNER | Planner-73 |
| PLANS | plants | PLASMA |
| platform | Platform Independent Graphical User Interface | Platon |
| Playground | playpen | pleonasm |
| Plexus | plingnet | PLisp |
| PL/I SUBSET | PL/I Subset G | PLITS |
| PL/M | PL/P | PL/PROPHET |
| PL/Seq | PLUM | plumbing |
| Plural EuLisp | PLUS | PM |
| P-mail | PML | PNU-Prolog |
| POCAL | POFAC | POGO |
| point of presence | POJO | poke |
| poll | polygon pusher | POM |
| Ponder | POOL | POOL2 |
| POOL-I | POOL-T | POP++ |
| POP-1 | POP-10 | POP-2 |
| POP-9X | POPART | POPCORN |
| POPJ | Poplar | POPLER |
| POPLOG | POPLOG ML | Portable Common Loops |
| Portable Scheme Debugger | Portable Scheme Interpreter | PORTAL |
| porting | Port Language | POSE |
| postcardware | posted write-through | posting |
| postmaster | POSTQUEL | POSYBL |
| POWER | power hit | PowerOpen |
| PowerOpen Association | PPL | PPN |
| PRA | PRE-CC | precedence lossage |
| PREP | Presentation Manager | prestidigitization |
| PRESTO | pretty pictures | prettyprint |
| preventive maintenance | PRI | Primary Rate Interface |
| Primenet, Inc. | prime time | principal type |
| PRINT I | printing discussion | PRISM |
| Privacy Enhanced Mail | privileged instruction | PRL |
| Probe | problem state | PROFILE |
| profile | PROGENY | proglet |
| Program Composition Notation | Program Design Language | Programmers Hierarchical Interactive Graphics System |
| programming | program transformation | PROJECT |
| project assurance | Prolog++ | Prolog-2 |
| Prolog-D-Linda | Prolog-II | Prolog-III |
| Prolog-Linda | Pronunciation | PROOF/L |
| Proposal Writing | proprietary | PROSE |
| ProSet | PROSPER | Prospero |
| protected mode | PROTEUS | protocol |
| Protocol Data Unit | PROTON | Protosynthex |
| Prototyper | prototyping | provably difficult |
| provably unsolvable | provocative maintenance | prowler |
| PSA | PS-ALGOL | PseudoScheme |
| pseudosuit | psychedelicware | P-TAC |
| ptc | Ptolemy | public directory |
| public domain | PUFFT | punt |
| Purdue University | pure lambda-calculus | PureLink |
| Pure Lisp | Purify | QA4 |
| qdjanus | QLISP | QLOG |
| Q'NIAL | QT-OBJECTS | Quadrature Amplitude Modulation |
| quadruple bucky | Quake | quality |
| Quantify | quantum bogodynamics | QUEASY |
| Queen Mary and Westfield College | Queen's University | QUEL |
| Quicksort | QUIKSCRIPT | QUIKTRAN |
| QUIN | Quintec-Objects | quintillion |
| quote chapter and verse | quotient | Qu-Prolog |
| Quty | QX | R2RS |
| R3RS | R4RS | rabbit job |
| race condition | rain dance | RAL |
| RAMIS II | random | randomness |
| RAPT | raster burn | Ratatosk |
| rat belt | RATEL | rational |
| rave | rave on! | RBASIC |
| RBCSP | RCA 1805 | RCC |
| rc file | RCL | rdb |
| RDL | real hack | real mode |
| real-time | Real-Time Euclid | Real-Time Mentat |
| real user | Real World | reaper |
| recent changes | RECOL | recursive definition |
| recursive type | Red | redex |
| RediLisp | redocumentation | reduction |
| re-engineering | REF-ARF | REFINE |
| Refined C | Refined Fortran | reflexive domain |
| Reflexive transitive closure | regex | regexp |
| register | register dancing | register set |
| Register Transfer Language | REG-SYMBOLIC | REGTRAL |
| reify | RELATIVE | RELCODE |
| religion of CHI | religious issues | RenderMan Shading Language |
| rendezvous | replacement algorithm | Replay |
| replicator | Request For Technology | Required-COBOL |
| Research Systems, Inc. | Resource Access Control Facility | restriction |
| restructuring | retcon | retrocomputing |
| reuse | REX | REXXWARE |
| RFC 2364 | RFE | RGB |
| rich object | Rich Text Format | RIGAL |
| Rigel | Right Thing | RL |
| rl | RLaB | ROADS |
| Robert T. Morris | ROBEX | robust |
| Rockwell Protocol Interface | ROME | root mode |
| Root Normal Form | root version | rot13 |
| rotary debugger | round-trip time | Royal Veterinary and Agricultural University |
| RPL | RPL-1 | RPT |
| RRS | RS-232C | Réseaux Associés pour la Recherche Européenne |
| Réseaux IP Européens | rsh | RTBM |
| RTC++ | RTEE | RTFAQ |
| RTL/2 | RTM | rude |
| RUFL | RUNCIBLE | runes |
| run-length encoding | run time | ruptime |
| RUTH | Rx | Saber-C |
| Saber-C++ | SAC | SAD SAM |
| SAFARI | safe | safety |
| safety-critical system | SAIC | SALEM |
| salescritter | S-ALGOL | SALT |
| salt | salt mines | salt substrate |
| SAM76 | SAMeDL | samurai |
| sandbender | Sandman | Santa Cruz Operation |
| SASL+LV | SASL-YACC | satisfiability problem |
| say | SB-Prolog | scag |
| scalability | SCAN | scanf |
| scanner | scanno | scan path |
| SCEPTRE | Scheduling Application Programming Interface | Schema Definition Set |
| Schema Representation language | schematic capture | Schematik |
| Scheme84 | Scheme88 | Scheme-Linda |
| Scheme Object System | Scheme Repository | Schlaer-Mellor |
| Sci-Hub | Scode | SCOOP |
| SCOOPS | Scorpion | Scott-closed |
| Scott domain | SCRAP | scratch |
| Scratchpad II | scream and die | Screamer |
| screaming tty | screwage | scribble |
| Scribe | SCRIPT | scrog |
| SCROLL | scrool | scrozzle |
| scuzzy | SDE | SDF |
| SDK | SDL | SDL 92 |
| SDMS | SEAL | search-and-destroy mode |
| secondary damage | second generation language | second-system effect |
| sector interleave | sector mapping | Secure Hash Algorithm |
| SEE | seggie | segmentation fault |
| segv | SEI | Seiko RC-4000 |
| Self-Extensible Language | self-reference | SEM |
| semantic gap | semi | semicolon |
| SENDIT | senior bit | SE-ODP |
| SEPIA | Seque | Sequel |
| sequence | sequential file matching | Sequential Parlog Machine |
| SERCOS | Serial Interface adapter | Serial Line IP |
| server | set | Setext |
| SETL | SETL2 | Set Priority Level |
| SEUS | SEX | SFBI |
| SFD-ALGOL | SFL | SFLV |
| SHACO | shallow binding | shambolic link |
| Shape_VC | Share and enjoy! | shared memory |
| shelf | shell out | SHIFT |
| shitogram | shotgun debugging | shovelware |
| Show-And-Tell | showstopper | Shub-Internet |
| SICStus Prolog | sidecar | side-effect |
| Siemens | SIFT | Sig |
| sig block | SIGhyper | SIGMA |
| sig virus | SIL | Silage |
| silly walk | silo | Similix |
| SIML/I | SIMPAC | SIMPAS |
| SIMPL | SIMPLE | SIMPL/I |
| SIMPL-T | SIMSCRIPT | SIMSCRIPT I.5 |
| SIMSCRIPT II.5 | simulated annealing | Simulating Digital Systems |
| Simultaneous Engineering Environment | SINA | since time T equals minus infinity |
| single-attached | Single Instruction/Multiple Data | SIPB |
| SIPLAN | Siprol | Siri |
| SIRTS | Skel-ML | Sketchpad |
| Skill | SKOL | skolemisation |
| S-K reduction machine | SKsh | SL5 |
| SLANG | slap on the side | slave tty |
| SLIM | SLIP | SLIPS |
| Sloop | slopsucker | slurp |
| SMALGOL | SMALL | Small-C |
| small-office/home-office | Smalltalk/V | SMART |
| smart card | SMCC | SMG |
| SML | SML# | sml2c |
| SMNP | smoke | smoke and mirrors |
| smoke test | smoking clover | SMoLCS |
| SMOP | SNAFU principle | snarf |
| snarf & barf | snarf down | snark |
| sneakernet | Sniff | SNOBOL2 |
| SNOBOL3 | SNOOPS | SO 2 |
| SOAR | social science number | SOCRATIC |
| SODAS | SoftBench | softcopy |
| SoftModem | Software bus | Software Engineering Environment |
| software interrupt | software laser | software reliability |
| softwarily | softy | SOHIO |
| Solid State Disk | SOLO | Solution Based Modelling |
| Solve | SOM | SOS |
| sound card | soundness | SP |
| SP2 | SP/2 | space leak |
| SPADE | SPAR | sparse |
| SPDL | Speakeasy | Spec |
| SPECbase_fp92 | SPECbase_int92 | SPECbaserate |
| special-case | Special Interest Group | specialisation |
| specific markup | SPECOL | speech synthesis |
| SPEED | SPEEDEX | speedometer |
| SPG | SPID | spiffy |
| SPIT | SPITBOL | SPL |
| SPLash! | splat | SPL/I |
| SPLINTER | Split-C | spoiler |
| spoo | spoofing | spooge |
| spool file | SPRINT | Sprintnet |
| SPS | SPUR | SQE |
| SQL/DS | SQL Module Language | SRC Modula-3 |
| SRDL | SRL | SRP |
| SSADM | STAB-11 | Stack Environment Control Dump machine |
| stack puke | STAGE2 | Standard for the exchange of product model data |
| Standard Instrument Control Library | Standard Lisp | Standard ML of New Jersey |
| standard semantics | Stanford Research Institute | STAR 0 |
| StarBurst | Starset | stateless |
| state transition diagram | STD | STD 15 |
| STD 9 | STDWIN | steam-powered |
| Steelman | STENSOR | stereogram |
| STIL | STING | STMP |
| stomp on | STONE | stone knives and bearskins |
| Stoneman | stop bit | stoppage |
| STP4 | Strand | Strand88 |
| Strawman | STREAM | strength reduction |
| STRESS | strict | strict evaluation |
| strided | string reduction | stroke |
| strongly connected component | structural recursion | structured analysis |
| Structure of Management Information | STRUDL | stub network |
| stubroutine | STUDENT | studly |
| Stupids | stupid-sort | Sturgeon's Law |
| subband encoding | subnet | subnet address |
| Subset-Equational Language | SuccessoR | sucking mud |
| Sue | SUGAR | SUIF |
| suit | SUMMER | SUMMER SESSION |
| sunspots | sun-stools | SunView |
| SUPER | supercompilation | SuperJanet |
| SUPERMAC | superpipelined | superprogrammer |
| super source quench | SuperTalk | superuser |
| supervisor mode | Sure | surfing |
| SURGE | suspension | Suzie COBOL |
| SVR4 | swab | SweetLambda |
| swizzle | SYDEL | SYGMA |
| syllogism | Sylvan | SYMBAL |
| SYMBOLANG | symbolic inference | Symbol Manipulation Program |
| Symmetric LISP | syntactic salt | syntactic sugar |
| syntax directed translation | Synthesizer Specification Language | sysape |
| sys-frog | SYSLISP | system |
| System V | System V Interface Definition | T |
| TABLET | TAC | TACL |
| tail-strict | TALE | Taligent |
| TANSTAAFL | tape | Target-Machine Description Language |
| TARTAN | TASM | TASS |
| taste | Taxis | Tbl |
| TC/IX | tcl-debug | Tcl-DP |
| Tcode | TCOL | TCOL.Ada |
| TCPIP | TDFL | Technical/Office Protocol |
| TechRef | telecommuting | telematics |
| TelEnet | Telescript | TeleUSE |
| TELNET | TELOS | TELSIM |
| TEMPLOG | TEMPO | Tempura |
| ten-finger interface | tense | TERMAC |
| terminak | terminal brain death | terminal emulation |
| terminal junkie | terminal server | Terminate and Stay Resident |
| termination analysis | term rewriting system | terpri |
| Terse | TET | Texinfo |
| text | T-gen | TGS-II |
| That's not a bug, that's a feature! | The Cuckoo's Egg | The Force |
| The Internet Account | THEO | theology |
| theory | The World Of Cryton | the X that can be Y is not the true X |
| ThingLab | Think C | thrash |
| thread | thud | tick |
| TickIT | tickle a bug | tick-list features |
| tiger team | timeout | time sink |
| time T | Time to Live | time zone |
| tinman+ | TINT | Tiny |
| Tiny Clos | TIP | TIPL |
| tip of the ice-cube | tired iron | TK!Solver |
| TL1 | TM | TMG |
| TMRC | TMRCie | tn3270 |
| TNXE6 | to a first approximation | toggle |
| TOK | token ring | toolsmith |
| TOPS-10 | tourist information | Tower Technology Corporation |
| toy | toy problem | TPL |
| TPS | tptc | Trafola-H |
| trampoline | TRANDIR | TRANQUIL |
| TRANS | transaction | transducer |
| Transistor-Transistor Logic | transitive | transitive closure |
| trap | trap door | trash |
| Trash-80 | trawl | TREET |
| TREETRAN | Trellis | Trellis Code Modulation |
| TRIGMAN | TROLL | troll |
| Trumpet | TS | TSEE |
| TSL-1 | TUB | tube time |
| Tuckals | Tuki | tunneling |
| Tuple Space Smalltalk | tupling | Turbo Prolog |
| Turing | Turing Plus | Turing tar-pit |
| turist | TUTOR | tweak |
| Twentel | TWIG | twilight zone |
| twink | twm | twonkie |
| two-to-the-N | TX-0 | type class |
| type scheme | typographical error | UAN |
| UBASIC | ubiquitous computing | uC++ |
| U-Code | uemacs | UHELP |
| UIMS | UIMX | UMB |
| UMB Scheme | UNCOL | undefined external reference |
| under the hood | U-NET Limited | unfold/fold |
| unicos | unifier | UNIFORM |
| Uniform Resource Number | UNISAP | United Technologies Research Cente |
| UNITY | Unix brain damage | Unix conspiracy |
| unproto | unshar | unswizzle |
| unwind-protect | unwind the stack | upgrade |
| upload | UPMAIL Tricia Prolog | upper bound |
| UPS | upthread | Uranus |
| URC | URouLette | user experience |
| user-friendly | user interface | user interface copyright |
| USG Unix | USL | usr |
| USSA | UUCPNET | uudecode |
| UUPC | V | V.32ter |
| Valid | validation | vanilla |
| VAR | VAX DOCUMENT | VAXen |
| vaxherd | vaxism | vaxocentrism |
| VAXset | VAXstation | VCODE |
| vdiff | VDM | VDM++ |
| Verdi | verification | VGQF |
| VHDL | VHLL | video conference |
| videotex | Vienna Definition Language | Vienna Fortran |
| Views | VIF | Viola |
| virgin | Viron | virtual cache |
| Virtual Control Program Interface | Virtual Device Location | Virtual Home Environment |
| virtual machine | virtual point of presence | virtual shredder |
| Virtual Telecommunications Access Method | visionary | Visual C++ |
| visual programming | visual programming environment | VITAL |
| VIVID | viz | VLDB |
| VMEbus | VML | voice-net |
| VPL | VRTX | VSP |
| VSX | VTS | VUE |
| VUIT | W3 | WA-12 |
| wabbit | wacco | WAFL |
| WAITS | waldo | wallpaper |
| wall time | WAM | wango |
| wank | wannabee | Warm Silence Software |
| wart | Wasserman | WATBOL |
| WATFIV | WATFOR | WCL |
| WE | Webster | Webster's Dictionary |
| wedged | wedgie | wedgitude |
| Weeble | weeds | weenie |
| Weenix | well-behaved | well-connected |
| WFL | whack | whacker |
| whalesong | What's a spline? | wheel |
| wheel bit | wheel wars | White pages |
| whois | WIBNI | wiggles |
| Wild_LIFE | Wisp | wizard |
| wizardly | WizDOM | WOMBAT |
| Woodenman | WOOL | Worcester Polytechnic Institute |
| wrap around | write-only code | write-only language |
| WRT | WSL | WTF |
| WTH | X11R4 | X11R5 |
| X.28 | X.29 | X.3 |
| X3J16 | X.75 | XA |
| Xaw | Xbase | xbeeb |
| XC | X client | X Consortium |
| Xcoral | X.desktop | XEROX PARC |
| Xfun | Xi | X Image Extension |
| Xlib | XMODEM-1K | xnf2ver |
| XNS | X/open Portability Guide | XPC |
| XperCASE | XPG3 | xref |
| XRemote | XRN | Xt |
| XTRAN | XUI | Xv++ |
| XView | XVT | XWIP |
| xxgdb | XXX | Y |
| Yaa | YABA | YAPS |
| YAUN | Yellow | Yellow Book CD-ROM |
| yellow wire | YLISP | YMODEM |
| YMODEM-G | You are not expected to understand this | YP |
| Yu-Shiang Whole Fish | ZAPP | ZEBRA |
| Zed | Zen | ZENO |
| ZEST | zigamorph | Zilog Z280 |
| zone | zorch | Z shell |
| ZUG | ZyXEL | {log} |
