| Bachman | backbone site | backgammon |
| back-propagation | BAD | bag on the side |
| BALITAC | bamf | bang |
| bang on | banner | 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 |
| Bourne shell | 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 |
| caret | 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 |
| CEN | 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 | convert.f90 |
| cooked mode | COOL | Coordinating Committee for Intercontinental Research Networks |
| copper | Copper Distributed Data Interface | coprocessor |
| copying garbage collection | 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 | 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 | firewall code |
| 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 |
| Metropolitan Area Network | 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 |
| 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 | pseudoprime |
| PseudoScheme | pseudosuit | psychedelicware |
| P-TAC | ptc | Ptolemy |
| PUB | pubic 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 | 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 Adaptor |
| 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 |
| STSC APL | 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} | |
