When something in a show receives a FanNickname which originated with the show's production team. Doesn't count if it's a technical term which can be applied to unrelated shows. Might be related to a DevelopmentGag.

If the series runs long enough, the term runs a high probability of becoming either canon or an in-universe nickname.

* The DCComics writing staff has a long tradition of referring to Mr. Mxyzptlk as "Bill" to sidestep the issue of how to pronounce his name.
** Mix-zees-pit-lick, according to one book.
** In the animated series, he does a rebus showing it as mix-Yess-spit-lick (blender, band 'Music/{{Yes}}' styled logo, tongue doing wet raspberry, tongue licking).

[[AC:Films -- Animation]]
* The animators for ''Disney/TheHunchbackOfNotreDame'' decided to nickname Frollo's horse [[FluffyTheTerrible Snowball]]. This has caught on with fans, thanks to an audio commentary, and retroactively also became the name of Jafar's horse and the monster pulling Hades' chariot.
** The sequence for the song "Hellfire" was nicknamed "Mr. Frollo's Wild Ride" by the animation team.
* The roach in ''WesternAnimation/WallE'' is named Hal.
** [[http://en.wikipedia.org/wiki/Hal_Roach Hal Roach]], [[IncrediblyLamePun geddit]]?

[[AC:Films -- Live-Action]]
* The shark in the movie ''Film/{{Jaws}}'' was nicknamed Bruce, after Creator/StevenSpielberg's lawyer.
* "Clover" from ''Film/{{Cloverfield}}''.
* "Creator/SteveBuscemi", the monster from ''Film/TheHost''.
* Doc Ock's tentacles in ''Film/SpiderMan2'' were dubbed [[Film/TheThreeStooges Moe, Curly, Larry and Joe]].
* The clown puppet in ''Franchise/{{Saw}}'' is named Billy.
* While filming ''Film/ManosTheHandsOfFate'', Harold Warren's crew called the film ''Mangos: The Cans of Fruit'' behind his back.
* The creature from "The Crate" segment of ''Film/{{Creepshow}}'' was nicknamed "Fluffy" (it even illustrated FluffyTheTerrible).
* In ''Film/AliensVsPredatorRequiem'', the Predator was nicknamed Wolf (after [[Film/PulpFiction Winston Wolf]]) and the Predalien was nicknamed Chet (after Bill Paxton's character in ''Film/WeirdScience'').
** The Berserker Predator in ''Film/{{Predators}}'' was nicknamed "Mr. Black".
* The huge battle between Neo and the army of Agent Smith clones from ''Film/TheMatrixReloaded'' was nicknamed "The Burly Brawl" after the screenplay BartonFink was working on. Even the song playing during that scene is named [[http://www.youtube.com/watch?v=xUZKFjaWf6Y Burly Brawl]].
* The alternate 1985 in ''Film/BackToTheFuturePartII'' was called "Biffhorrific 1985" during production.
* Slimer from ''Film/{{Ghostbusters}}'' was called "Onion Head" during production.

* While writing the ''Literature/HarryPotter'' series, Creator/JKRowling mentally used the term "The Big Seven" to refer to Harry, Ron, Hermione, Neville, Ginny, Luna, and Draco.

[[AC:Live-Action Television]]
* The Pepperpots (Pythons in old lady drag) in ''Series/MontyPythonsFlyingCircus''.
* ''Franchise/StarTrek'', starting with ''The Next Generation'', has "Okudagrams" - the displays on the touchscreens and monitors - after their creator Michael Okuda.
** The engineering access tubes were dubbed "Jeffries tubes", which was a {{canon}} name by ''TNG''.
** Irving A. Feinberg was the property master for ''Series/StarTrekTheOriginalSeries''. The little gizmos he came up with for the show (such as the medical scanner and the laser scalpel) were nicknamed "Feinbergers" by the cast and crew. The usage later spread to the fanbase.
** Similarly, the wall panels were often labeled with seemingly nonsensical phrases, like "[=GNDN435=]". This actually stood for "Goes Nowhere, Does Nothing", indicating the just-for-looks nature of all the pipes and wires in the Enterprise's interior.
* Caprica-6 from ''Series/{{Battlestar Galactica|2003}}'', although that eventually made it into the show dialog as well.
* HRG (Horn-Rimmed Glasses) in ''Series/{{Heroes}}''.
** The concentration face Hiro Nakamura makes in order to travel through time or space is apparently called the "squishy blinky" by the production crew.
* The pterodactyl, Myfanwy, in ''Series/{{Torchwood}}''.
* The Barracks on ''Series/{{Lost}}'' are called "New Otherton" by production, which spread to fans and then incorporated into dialogue as Sawyer's nickname for the place.
* On ''Series/StargateSG1'', "kawoosh" was a production nickname used to describe the "unstable vortex" formed when a Stargate opens. The term wasn't used on the show until the episode "Crusade", in which it was coined in-universe by Samantha Carter:
-->'''Mitchell''': I'm sorry, the what?\\
'''Carter''': The unstable vortex of a forming wormhole. Kawoosh!\\
'''Mitchell''': Don't think I've ever heard you call it that before.\\
'''Carter''': Really?\\
'''Mitchell''': Don't get me wrong, it's good.
** In [[Film/{{Stargate}} the movie]], the stargate had a conical vortex coming out the back of it while active, which was called "the strudel" in one of the featurettes. The strudel was dropped in the TV series.
* ''Series/DoctorWho'':
** Several Doctors get nicknames based on the character concepts going around the production office when discussing how the new Doctor should be played:
*** The Cosmic {{Hobo}}: The Second Doctor.
*** The Bohemian: The Fourth Doctor.
** "Fungoid Fred", "Toadstool Taffy" and "Mushroom Malone" are the names of the Fungoids in "The Chase".
** "Fred" was also the name of the [[TheDitz stupid Dalek]] in "The Chase".
** "Bafflegab" is what Creator/RobertHolmes called what we on this wiki call {{Technobabble}}.
** A "loop" is a name coined by Creator/TerranceDicks to refer to a story in which the characters [[{{Padding}} get captured, escape and then get captured again by the same people]] to extend a story to six episodes. Not to be confused with a "Moffat loop", which is the nickname coined by Creator/PeterCapaldi and Creator/JennaColeman to refer to the kind of TemporalParadox StableTimeLoop plot that is favoured by Creator/StevenMoffat.
* On the set of ''Series/TheXFiles'', the ScullyBox was referred to as the "Gilly-Board", referring to actress Creator/GillianAnderson.
* The [=RoboCop=] nickname for John Cable after he become a Franchise/RoboCop in ''Series/RoboCopPrimeDirectives'' first came from the production staff. In the series itself, he's either referred to by nis real name or "Crime Prevention Unit 002".

* In ''VideoGame/{{Portal}}'', the portal maneuver was called "flinging," and the Aperture Science Material Emancipation Grid was dubbed the "fizzler". [[TheGhost The absent character]] who left behind dens and scrawlings on the walls was named the Rat Man (for his scrounger-in-the-wall habits). Later, he was promoted to a first-order character via an interquel comic book. His real name is [[StevenUlyssesPerhero Doug Rattman]].
* The main character of the ''VideoGame/WingCommander'' series originally had no default name, but the production crew called him Bluehair. He was later given the name Blair[[labelnote:*]]'''Bl'''ueh'''air'''[[/labelnote]] as a nod to this.
* During development, ''VideoGame/{{VVVVVV}}'' was simply called "V" by its creator Terry Cavanagh.
* Guybrush Threepwood, hero of the ''VideoGame/MonkeyIsland'' franchise, was named Guybrush from the file containing the "guy-brush" the developers used to animate his sprite. It stuck as his name.
* In late 2010 [[VideoGame/{{X}} Egosoft]] announced they were working on a project which they called ''TNBT'', short for ''The Next Big Thing''. In 2011, it was announced as ''VideoGame/XRebirth''.
* Combining this trope with ThemeNaming, most of ''Franchise/TheLegendOfZelda'' games produced in the UsefulNotes/Nintendo3DS and UsefulNotes/WiiU generation are internally named after playing cards. ''[[VideoGame/TheLegendOfZeldaTheWindWaker The Wind Waker HD]]'' is called "King", ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime Ocarina of Time 3D]]'' is called "Queen", ''[[VideoGame/TheLegendOfZeldaALinkBetweenWorlds A Link Between Worlds]]'' is called "Jack", and ''[[VideoGame/TheLegendOfZeldaMajorasMask Majora's Mask 3D]]'' is called "Joker".
* The unreleased game many fans know as [[FalloutVanBuren Fallout: Van Buren]] was never actually planned to be released under that name. It would have been called {{VideoGame/Fallout 3}} had [[Creator/InterplayEntertainment Interplay]] not gone under, and a proper Fallout 3 didn't come out until BethesdaSoftworks revived the franchise in 2008.

* The OneWingedAngel form of the Ocean Spirit in ''WesternAnimation/AvatarTheLastAirbender'' was called Koizilla during production. You'd be hard-pressed to find anyone that calls it anything else. Heck, it's a 90-foot carp. Half the people using the term probably [[PhraseCatcher coined it independently]].