| 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 | Bourne Again SHell | 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 |
| 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 | HTTP response status code | 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 | 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 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 |
| stalker_portal/c/version.js | 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} | |
