List of computer term etymologies
This is a list of the origins of computer-related terms or terms used in the computing world (i.e., a list of computer term etymologies). It relates to both computer hardware and computer software.

Names of many computer terms, especially computer applications, often relate to the function they perform, e.g., a compiler is an application that compiles (programming language source code into the computer's machine language). However, there are other terms with less obvious origins, which are of etymological interest. This article lists such terms.

A

 ABEND – originally from an IBM System/360 error message, short for "abnormal end". Jokingly reinterpreted as German Abend ("evening"), because "it is what system operators do to the machine late on Friday when they want to call it a day."

 Ada – named after Ada Lovelace, who is considered by many to be the first programmer.
 Apache – originally chosen from respect for the Native American Indian tribe of Apache. It was suggested that the name was appropriate, as Apache began as a series of patches to code written for NCSA's HTTPd daemon. The result was "a patchy" server.

 AWK – composed of the initials of its authors Aho, Weinberger, and Kernighan.

B

 B – probably a contraction of "BCPL", reflecting Ken Thompson's efforts to implement a smaller BCPL in 8 KB of memory on a DEC PDP-7. Or, named after Bon.

 biff – named after a dog known by the developers at Berkeley, who – according to the UNIX manual page – died on 15 August 1993, at the age of 15, and belonged to a certain Heidi Stettner. Some sources report that the dog would bark at the mail carrier, making it a natural choice for the name of a mail notification system. The Jargon File contradicts this description, but confirms at least that the dog existed.

 bit – first used by Claude E. Shannon in his seminal 1948 paper A Mathematical Theory of Communication. Shannon's "bit" is a portmanteau of "binary digit". He attributed its origin to John W. Tukey, who had used the word in a Bell Labs memo of 9 January 1947.

 Bon – created by Ken Thompson and named either after his wife Bonnie, or else after "a religion whose rituals involve the murmuring of magic formulas" (a reference to the Tibetan native religion Bön).
 booting or bootstrapping – from the phrase "to pull oneself up by one's bootstraps", originally used as a metaphor for any self-initiating or self-sustaining process. Used in computing due to the apparent paradox that a computer must run code to load anything into memory, but code cannot be run until it is loaded.
 bug – often (but erroneously) credited to Grace Hopper. In 1946, she joined the Harvard Faculty at the Computation Laboratory where she traced an error in the Harvard Mark II to a moth trapped in a relay. This bug was carefully removed and taped to the log book. However, use of the word 'bug' to describe defects in mechanical systems dates back to at least the 1870s, perhaps especially in Scotland. Thomas Edison, for one, used the term in his notebooks and letters.
 byte – coined by Werner Buchholz in June 1956 during the early design phase for the IBM Stretch computer.

C

 C – a programming language.
Dennis Ritchie, having improved on the B language, named his creation New B. He later renamed it C. (See also D).

 C++ – an object-oriented programming language, a successor to the C programming language.
C++ creator Bjarne Stroustrup named his new language "C with Classes" and then "new C". The original language began to be called "old C" which was considered insulting to the C community. At this time Rick Mascitti suggested the name C++ as a successor to C.  In C the '++' operator increments the value of the variable it is appended to, thus C++ would increment the value of C.

 computer – from the human computers who carried out calculations mentally and possibly with mechanical aids, now replaced by electronic programmable computers.
 cookie – a packet of information that travels between a browser and the web server.
 The term was coined by web browser programmer Lou Montulli after the term "magic cookies" used by Unix programmers. The term "magic cookie" in turn derives from "fortune cookie", a cookie with an embedded message.

 Cursor (user interface) - Cursor is Latin for 'runner.' A cursor is the name given to the transparent slide engraved with a hairline that is used for marking a point on a slide rule. The term was then transferred to computers through analogy.

D

 D – a programming language.
Designed by Walter Bright as an improved C, avoiding many of the design problems of C (e.g., extensive pointer manipulation, unenforced array boundaries, etc.).

 daemon – a process in an operating system that runs in the background.
 It is not an acronym for Disk And Execution Monitor: according to the original team that introduced the concept, the use of the word daemon was inspired by the Maxwell's demon of physics and thermodynamics (an imaginary agent which helped sort molecules with differing velocities and worked tirelessly in the background) The term was embraced, and possibly popularized, by the Unix operating systems which supported multiple background processes: various local (and later Internet) services were provided by daemons. This is exemplified by the BSD mascot, John Lasseter's drawing of a friendly imp.

 Dashboard - Originally, the word dashboard applied to a barrier of wood or leather fixed at the front of a horse-drawn carriage or sleigh to protect the driver from mud or other debris "dashed up" (thrown up) by the horses' hooves.[1] The first known use of the term (hyphenated as dash-board, and applied to sleighs) dates from 1847.[2] Commonly these boards did not perform any additional function other than providing a convenient handhold for ascending into the driver's seat, or a small clip with which to secure the reins when not in use.
 Debian – a Linux distribution.
A portmanteau of the names Ian Murdock, the Debian Project creator, and Debra Lynn, Ian's then girlfriend and future wife.

 default – an initial value for a variable or user setting.
The original meaning of the word 'default' is 'failure to fulfill an obligation'. The obligation here is to provide an input that is required by a program. In the early days of programming, if an input value was missing, or 'null', the program would almost certainly crash. This is often to do with variable 'typing' – for example, a simple calculation program would expect a number as an input: any other type of input such as a text string or even a null (no value), would make any mathematical operation such as multiplication impossible. In order to guard against this possibility, programmers defined initial values that would be used if the user *defaulted* or failed to fulfill the obligation of providing the correct input value. Over time, the term 'default' has come to refer to the initial value itself.

E

 Ethernet – a computer networking technology.
According to Robert Metcalfe (one of its initial developers), he devised the name in an early company memo as an endocentric compound of "luminiferous ether"—the "substance" that was widely believed to be the medium through which electromagnetic radiation propagated in the late 19th century—and "net", short for "network". When the networking team would describe data flowing into the network infrastructure, they would routinely describe it as data packets going "up into the ether".

F

 finger – Unix command that provides information about users logged into a system.
Les Earnest wrote the finger program in 1971 to provide for users who wanted information about other users on a network or system. According to Earnest, it was named after the act of pointing, because it "bypassed the need to point to a user ID and ask, 'Who is that?'"

 foobar – from the U.S. Army slang acronym, FUBAR. Both foo and bar are commonly used as metasyntactic variables.

G

 Gentoo – a Linux distribution.
Named after a variety of penguin, the universal Linux mascot.

 Git – a distributed version control system.
In the project's initial README file, Linus Torvalds wrote that "'git' can mean anything, depending on your mood", and offers several definitions:
 A random three-letter combination which is pronounceable and not a preexisting Unix command
 British English slang, meaning a stupid or contemptible person
 An acronym for "global information tracker" (when it works)
 An acronym for "goddamn idiotic truckload of sh*t" (when it breaks)
When asked about the origin of the name, Torvalds jokingly stated, "I'm an egotistical bastard, and I name all my projects after myself."

 GNU – a project with an original goal of creating a free operating system.
The gnu is also a species of African antelope. The founder of the GNU project Richard Stallman liked the name because of the humour associated with its pronunciation, and was also influenced by The Gnu Song, by Flanders and Swann, which is sung by a gnu. It is also an early example of a recursive acronym: "GNU's Not Unix".

 Google – a search engine.
The name started as an exaggerated boast about the amount of information the search engine would be able to search. It was originally named 'Googol', a word for the number represented by 1 followed by 100 zeros. The word was originally invented by Milton Sirotta, nephew of mathematician Edward Kasner, in 1938 during a discussion of large numbers and exponential notation.

 Gopher – an early protocol for distributing documents over a network. Declined in favor of the World Wide Web.
The name was coined by developer Farhad Anklesaria, as a play on , an assistant who fetches things, and a gopher, who digs, as if through nested hierarchies. The name was also inspired by Goldy Gopher, the mascot for the University of Minnesota where the protocol was developed.

 grep – a Unix command line utility
The name comes from a command in the Unix text editor ed that takes the form  g/re/p  meaning search globally for a regular expression and print lines where instances are found. "Grep" like "Google" is often used as a verb, meaning "to search".

H

 Hotmail – free email service, now named Outlook.com.
Founder Jack Smith got the idea of accessing e-mail via the web from a computer anywhere in the world. When Sabeer Bhatia came up with the business plan for the mail service, he tried all kinds of names ending in 'mail' and finally settled for Hotmail as it included the letters "HTML" – the markup language used to write web pages. It was initially referred to as HoTMaiL with selective upper casing.

I

 i18n – short for "internationalization".
"18" is for the number of letters between the i and the n. Related, less common terms include l10n (for localization), g11n (for globalization) and a11y (for accessibility).

 ICQ – an instant messaging service.
 ICQ is not an initialism. It is a play on the phrase "I seek you" or "Internet seek you" (similar to CQ in ham radio usage).

 ID10T – pronounced "ID ten T" – is a code frequently used by a customer service representative (CSR) to annotate their notes and identify the source of a problem as the person who is reporting the problem rather than the system being blamed. This is a thinly veiled reference to the CSR's opinion that the person reporting the problem is an IDIOT. Example: Problem reported caused by ID10T, no resolution possible. See also PEBKAC.

J

 Jakarta Project – a project constituted by Sun and Apache to create a web server for Java servlets and JSPs.
Jakarta was the name of the conference room at Sun where most of the meetings between Sun and Apache took place. The conference room was most likely named after Jakarta, the capital city of Indonesia, which is located on the northwest coast of the island of Java.

 Java – a programming language by Sun Microsystems, later acquired by Oracle.
Named after , a blend of coffee from the island of Java, and also used as slang for coffee in general. The language was initially called "Greentalk" and later "Oak", but this was already trademarked by Oak Technologies, so the developers had to choose another name shortly before release. Other suggested names were "WebRunner", "DNA", and "Silk".

 JavaScript – a programming language.
It was originally developed by Brendan Eich of Netscape under the name "Mocha", which was later renamed to "LiveScript", and finally to "JavaScript". The change of name from LiveScript to JavaScript roughly coincided with Netscape adding support for Java technology in its Netscape Navigator web browser. JavaScript was first introduced and deployed in the Netscape browser version 2.0B3 in December 1995. The naming has caused confusion, giving the impression that the language is a spin-off of Java, and it has been characterized by many as a marketing ploy by Netscape to give JavaScript the cachet of what was then the hot new web-programming language.

K

 Kerberos – a computer network authentication protocol that is used by both Windows 2000 and Windows XP as their default authentication method.
When created by programmers at MIT in the 1970s, they wanted a name that suggested high security for the project, so they named it after Kerberos, in Greek mythology the three-headed dog guarding the gates of Hades. The reference to Greek mythology is most likely because Kerberos was developed as part of Project Athena.

L

 Linux – an operating system kernel, and the common name for many of the operating systems which use it.
Linux creator Linus Torvalds originally used the MINIX operating system on his computer, didn't like it, liked DOS less, and started a project to develop an operating system that would address the problems of MINIX. Hence the working name was Linux (Linus' Minix). Originally, however, Linus had planned to have it named Freax (free + freak + x). His friend Ari Lemmke encouraged Linus to upload it to a network so it could be easily downloaded. Ari gave Linus a directory named linux on his FTP server, as he did not like the name Freax.

 Lisa – A personal computer designed at Apple Computer during the early 1980s.
Apple stated that Lisa was an acronym for Local Integrated Software Architecture; however, it is often inferred that the machine was originally named after the daughter of Apple co-founder Steve Jobs, and that this acronym was invented later to fit the name. Accordingly, two humorous suggestions for expanding the acronym included Let's Invent Some Acronyms, and Let's Invent Silly Acronyms.

 liveware – computer personnel. 
A play on the terms "software" and "hardware". Coined in 1966, the word indicates that sometimes the computer problem is not with the computer itself, but with the user.

 Lotus Software – Lotus founder Mitch Kapor got the name for his company from 'The Lotus Position' ('Padmasana' in Sanskrit). Kapor used to be a teacher of Transcendental Meditation technique as taught by Maharishi Mahesh Yogi.

M

 Macintosh, Mac – a personal computer from Apple Computer.
From McIntosh, a popular type of apple.

N

 Nerd – A colloquial term for a computer person, especially an obsessive, singularly focused one. Originally created by Dr. Seuss from his book If I Ran the Zoo.

O

 Oracle – a relational database management system (RDBMS).
Larry Ellison, Ed Oates and Bob Miner were working on a consulting project for the CIA (Central Intelligence Agency). The code name for the project was Oracle (the CIA evidently saw this as a system that would give answers to all questions). The project was designed to use the newly written SQL database language from IBM. The project eventually was terminated but they decided to finish what they started and bring it to the world. They kept the name Oracle and created the RDBMS engine.

P

 Pac-Man – a video arcade game.
 The term comes from paku paku which is a Japanese onomatopoeia used for noisy eating; similar to chomp chomp. The game was released in Japan with the name Puck-Man, and released in the US with the name Pac-Man, fearing that kids may deface a Puck-Man cabinet by changing the P to an F.

Patch – A set of changes to a computer program or its supporting data designed to update, fix, or improve it.
 Historically, software suppliers distributed patches on paper tape or on punched cards, expecting the recipient to cut out the indicated part of the original tape (or deck), and patch in (hence the name) the replacement segment

 PCMCIA – the standards body for PC card and ExpressCard, expansion card form factors.
 The Personal Computer Memory Card International Association is an international standards body that defines and promotes standards for expansion devices such as modems and external hard disk drives to be connected to notebook computers. Over time, the acronym PCMCIA has been used to refer to the PC card form factor used on notebook computers. A twist on the acronym is People Can't Memorize Computer Industry Acronyms.

 PEBKAC – an acronym for "Problem Exists Between Keyboard And Chair", which is a code frequently used by a customer service representative (CSR) to annotate their notes and identify the source of a problem as the person who is reporting the problem rather than the system being blamed.  This is a thinly veiled reference to the CSR's opinion that the person reporting the problem is the problem. Example: PEBKAC, no resolution possible. See also ID10T.
 Pentium – a series of microprocessors from Intel.
The fifth microprocessor in the 80x86 series. It would have been named i586 or 80586, but Intel decided to name it Pentium (penta = five) after it lost a trademark infringement lawsuit against AMD due to a judgment that numbers like "286", "386", and "486" cannot be trademarked.  According to Intel, Pentium conveys a meaning of strength, like titanium.

Since some early Pentium chips contained a mathematical precision error, it has been jokingly suggested that the reason for the chip being named Pentium rather than 586 was that Intel chips would calculate 486 + 100 = 585.99999948.

 Perl – an interpreted scripting language.
Perl was originally named Pearl, after the "pearl of great price" of Matthew 13:46. Larry Wall, the creator of Perl, wanted to give the language a short name with positive connotations and claims to have looked at (and rejected) every three- and four-letter word in the dictionary. He even thought of naming it after his wife Gloria. Before the language's official release Wall discovered that there was already a programming language named Pearl, and changed the spelling of the name. Although the original manuals suggested the backronyms "Practical Extraction and Report Language" and "Pathologically Eclectic Rubbish Lister", these were intended humorously.

 PHP – a server-side scripting language
Originally named "Personal Home Page Tools" by creator Rasmus Lerdorf, it was rewritten by developers Zeev Suraski and Andi Gutmans who gave it the recursive name "PHP Hypertext Preprocessor". Lerdorf currently insists the name should not be thought of as standing for anything, for he selected "Personal Home Page" as the name when he did not foresee PHP evolving into a general-purpose programming language.

 Pine – e-mail client.
Many people believe that Pine stands for "Pine Is Not Elm". However, one of its original authors, Laurence Lundblade, insists this was never the case and that it started off simply as a word and not an acronym; his first choice of a backronym for pine would be "Pine Is Nearly Elm".  Over time it was changed to mean Program for Internet News and E-mail.

 ping – a computer network tool used to detect hosts.
The author of ping, Mike Muuss, named it after the pulses of sound made by a sonar called a "ping". Later Dave Mills provided the backronym "Packet Internet Groper".

 Python – an interpreted scripting programming language.
Named after the television series Monty Python's Flying Circus.

R

 Radio button – a GUI widget used for making selections.
Radio buttons got their name from the preset buttons in radio receivers. When one used to select preset stations on a radio receiver physically instead of electronically, depressing one preset button would pop out whichever other button happened to be pushed in.

 Red Hat Linux – a Linux distribution from Red Hat.
Company founder Marc Ewing was given the Cornell lacrosse team cap (with red and white stripes) by his grandfather while at college. People would turn to him to solve their problems, and he was referred to as "that guy in the red hat". He lost the cap and had to search for it desperately. The manual of the beta version of Red Hat Linux had an appeal to readers to return the hat if found by anyone.

 RSA – an asymmetric algorithm for public key cryptography.
Based on the surnames of the authors of this algorithm – Ron Rivest, Adi Shamir and Len Adleman.

S

 Samba – a free implementation of Microsoft's networking protocol.
The name samba comes from inserting two vowels into the name of the standard protocol that Microsoft Windows network file system use, named Server Message Block (SMB). The author searched a dictionary using grep for words containing S M and B in that order; the only matches were Samba and Salmonberry.

 shareware – coined by Bob Wallace to describe his word processor PC-Write in early 1983. Before this Jim Knopf (also known as Jim Button) and Andrew Fluegelman called their distributed software "user supported software" and "freeware" respectively, but it was Wallace's terminology that prevailed.
 spam – unwanted repetitious messages, such as unsolicited bulk e-mail.
 The term spam is derived from the Monty Python SPAM sketch, set in a cafe where everything on the menu includes SPAM luncheon meat. While a customer plaintively asks for some kind of food without SPAM in it, the server reiterates the SPAM-filled menu. Soon, a chorus of Vikings join in with a song: "SPAM, SPAM, SPAM, SPAM, SPAM, lovely SPAM, wonderful SPAM", over and over again, drowning out all conversation.

 SPIM – a simulator for a virtual machine closely resembling the instruction set of MIPS processors, is simply MIPS spelled backwards. In recent time, spim has also come to mean SPam sent over Instant Messaging.
 Swing – a graphics library for Java.
Swing was the code-name of the project that developed the new graphic components (the successor of AWT). It was named after swing, a style of dance band jazz that was popularized in the 1930s and unexpectedly revived in the 1990s. Although an unofficial name for the components, it gained popular acceptance with the use of the word in the package names for the Swing API, which begin with javax.swing.

T

 Tomcat – a web server from the Jakarta Project.
Tomcat was the code-name for the JSDK 2.1 project inside Sun. Tomcat started off as a servlet specification implementation by James Duncan Davidson who was a software architect at Sun. Davidson had initially hoped that the project would be made open-source, and since most open-source projects had O'Reilly books on them with an animal on the cover, he wanted to name the project after an animal. He came up with Tomcat since he reasoned the animal represented something that could take care of and fend for itself.

 troff – a document processing system for Unix.
Troff stands for "typesetter roff", although many people have speculated that it actually means "Times roff" because of the use of the Times font family in troff by default.  Troff has its origins from roff, an earlier formatting program, whose name is a contraction of "run off".

 Trojan horse – a malicious program that is disguised as legitimate software.
The term is derived from the classical myth of the Trojan Horse. Analogously, a Trojan horse appears innocuous (or even to be a gift), but in fact is a vehicle for bypassing security.

 Tux – The penguin mascot used as the primary logo for the Linux kernel, and Linux-based operating systems.
Linus Torvalds, the creator of Linux, suggested a penguin mascot because he "likes penguins a lot", and wanted Linux to be associated with something "kind of goofy and fun". The logo was originally created by Larry Ewing in 1996 as an entry in a Linux Logo competition. The name Tux was contributed by James Hughes, who suggested "(T)orvolds (U)ni(X) — TUX!"

U

 Ubuntu Linux – a Debian-based Linux distribution sponsored by Canonical Ltd.
Derived from ubuntu, a South African ideology.

 Unix – an operating system.
When Bell Labs pulled out of the MULTiplexed Information and Computing System (MULTICS) project, which was originally a joint Bell Labs/GE/MIT project, Ken Thompson of Bell Labs, soon joined by Dennis Ritchie, wrote a simpler version of the operating system for a spare DEC minicomputer, allegedly found in a corridor. They needed an OS to run the game Space Travel, which had been compiled under MULTICS. The new OS was named UNICS – UNiplexed Information and Computing System by Brian Kernighan.

V

 vi – a text editor,
Initialism for visual, a command in the ex editor which helped users to switch to the visual mode from the ex mode. the first version was written by Bill Joy at UC Berkeley.

 Vim – a text editor.
Acronym for Vi improved after Vim added several features over the vi editor. Vim however had started out as an imitation of Vi and was expanded as Vi imitation.

 Virus – a piece of program code that spreads by making copies of itself.
The term virus was first used as a technical computer science term by Fred Cohen in his 1984 paper "Computer Viruses Theory and Experiments", where he credits Len Adleman with coining it. Although Cohen's use of virus may have been the first academic use, it had been in the common parlance long before that. A mid-1970s science fiction novel by David Gerrold, When H.A.R.L.I.E. was One, includes a description of a fictional computer program named VIRUS that worked just like a virus (and was countered by a program named ANTIBODY). The term "computer virus" also appears in the comic book "Uncanny X-Men" No. 158, published in 1982. A computer virus's basic function is to insert its own executable code into that of other existing executable files, literally making it the electronic equivalent to the biological virus, the basic function of which is to insert its genetic information into that of the invaded cell, forcing the cell to reproduce the virus.

W

 Wiki or WikiWiki – a hypertext document collection or the collaborative software used to create it.
Coined by Ward Cunningham, the creator of the wiki concept, who named them for the "wiki wiki" or "quick" shuttle buses at Honolulu Airport. Wiki wiki was the first Hawaiian term he learned on his first visit to the islands. The airport counter agent directed him to take the wiki wiki bus between terminals.

 Worm –  a self-replicating program, similar to a virus.
 The name 'worm' was taken from a 1970s science fiction novel by John Brunner entitled The Shockwave Rider. The book describes programs known as "tapeworms" which spread through a network for the purpose of deleting data. Researchers writing an early paper on experiments in distributed computing noted the similarities between their software and the program described by Brunner, and adopted that name.

 WYSIWYG – describes a system in which content during editing appears very similar to the final product.
Acronym for What You See Is What You Get, the phrase was originated by a newsletter published by Arlene and Jose Ramos, named WYSIWYG. It was created for the emerging Pre-Press industry going electronic in the late 1970s.

X

 X Window System –  a windowing system for computers with bitmap displays.
X derives its name as a successor to a pre-1983 window system named the W Window System.

Y

 Yahoo! – internet portal and web directory.
Yahoo!'s history site says the name is an acronym for "Yet Another Hierarchical Officious Oracle", but some remember that in its early days (mid-1990s), when Yahoo! lived on a server named akebono.stanford.edu, it was glossed as "Yet Another Hierarchical Object Organizer." The word "Yahoo!" was originally invented by Jonathan Swift and used in his book Gulliver's Travels. It represents a person who is repulsive in appearance and action and is barely human. Yahoo! founders Jerry Yang and David Filo selected the name because they considered themselves yahoos.

Z

 zip – a file format, also used as a verb to mean compress.
The file format was created by Phil Katz, and given the name by his friend Robert Mahoney. The compression tool Phil Katz created was named PKZIP. Zip means "speed", and they wanted to imply their product would be faster than ARC and other compression formats of the time.

See also 
 Glossary of computer terms
 List of company name etymologies
 Lists of etymologies

References 

Etymologies
Computer terms