History Main / LetteredSequel

* ''VideoGame/GuiltyGear'': ''VideoGame/GuiltyGearTheMissingLink'' was given a follow-up in the form of ''VideoGame/GuiltyGearX'', which had its own follow-up in ''VideoGame/GuiltyGearXX'' and [[CapcomSequelStagnation its various expansions]]. However, WordOfGod would eventually relegate ''GGX'' and ''GGXX'' to sideplot status with the coming of ''VideoGame/GuiltyGear2Overture'', released almost ten years after the original. (That said, unlike most {{Gaiden Game}}s, the events of ''X'', ''XX'', and ''Accent Core Plus'' are very much in-canon and shape the plot of future games.) ''Guilty Gear 2'' was then followed by ''[[SequelNumberSnarl Guilty Gear Xrd]]''.

* ''A Certain Scientific Railgun S'' and ''A Certain Scientific Railgun T'' are the follow-up seasons to the popular ''Manga/ACertainScientificRailgun'' staring Mikoto Misaka. Funnily enough, sister series ''LightNovel/ACertainMagicalIndex'' used [[NumberedSequel Roman numerals]] for its second and third seasons.

* The second season of ''[[LightNovel/NyarukoCrawlingWithLove Haiyore! Nyarko-San]]'' anime is called ''Haiyore! Nyarko-San W'', as a reference to ''Series/KamenRiderDouble'', while the OVA conclusion is tiled ''Haiyore! Nyarko-San F'', with the F standing for "[[GrandFinale Final]]."

** ''VideoGame/MegaManX'', the second series of the franchise, named after the future successor of original hero, X.
** In a further distant sequel, ''VideoGame/MegaManZX'', "ZX" is pronounced as ''Zekkusu''. This is because the series is a direct successor to the ''VideoGame/MegaManZero'' series (itself a SequelSeries to ''MMX'') and the first game sees the protagonist(s) [[HenshinHero wield the powers of Zero and X in conjunction]].

** Then there's ''Anime/TurnAGundam'' ("Turn A Gundam") which is, as revealed late in the series, [[spoiler:not just another AlternateUniverse series, but the DistantFinale to ''all of them'', past, present, '''and''' future]]. This makes the title a GeniusBonus, as "∀" is a mathmatical symbol {{meaning|fulName}} "all items in a set."

* Played with in ''VideoGame/MortalKombatX''. It's the tenth mainline game in the series, but the X is always pronounced as the letter. It was also preceded by a [[VideoGame/MortalKombat9 title that wasn't numbered]].

* Though the ''VideoGame/EtrianOdyssey'' games are numbered with the Roman system (except ''Untold 2''), the X in ''Etrian Odyssey X'' doesn't stand for 10 (it's the ninth game overall, and the sixth main one), but for Cross. In the West, the trope is replaced with WordSequel (''VideoGame/EtrianOdysseyNexus'').

* In Japan, ''VideoGame/SuperSmashBros'' is known as ''Great Melee Smash Brothers''. The sequels, ''[[VideoGame/SuperSmashBrosMelee Melee]]'' and ''[[VideoGame/SuperSmashBrosBrawl Brawl]]'', are known respectively as ''Great Melee Smash Brothers DX'' and ''Great Melee Smash Brothers X'' (DX stands for Deluxe). Subsequent installments avert this trope in favor of SuperTitle64Advance (''for Nintendo 3DS'' and ''for Nintendo Wii U'', just like [[SuperSmashBrosForNintendo3DSAndWiiU the international versions]]) and WordSequel (''[[DreamMatchGame Special]]'', again like the international versions which use ''[[VideoGame/SuperSmashBrosUltimate Ultimate]]'') respectively.

* ''VideoGame/YaibaNinjaGaidenZ'' is a zombie slashing spin-off of ''VideoGame/NinjaGaiden''.

-->-- '''Ichiro Mizuki''', Anime/MazingerZ theme singer.

Normally, to name {{Sequel}}s you just simply add [[NumberedSequel a number]] or [[WordSequel some words]], so the sequel of ''Foomovie'' will be titled ''Foomovie 2''? Wrong, it's ''Foomovie Z''!

This trope is a title naming convention for sequels, adaptations, or work expansions of a franchise in which they just add a letter or two to set up the name. Sometimes the titles will end in a rather cool sounding letter such as [[XtremeKoolLetterz Z or X]] [[VideoGame/MegaManZX (Or both)]]. The letter sometimes stands for something meaningful and relevant to the plot, or just being thrown at random until [[WordOfGod the creator]] explains what it means.

* The season sequels of the ''Franchise/DragonBall'' anime series are titled ''Anime/DragonBallZ'' and ''Anime/DragonBallGT''. The protagonists are often referred to as "the Z Fighters", but what the Z means or why they'd need a group name for a loosely-affiliated group of friends and rivals is never explained within the show.[[note]]The real-life explanation is that, since Toriyama was thinking of concluding the story soon whilst in the middle of the Saiyan arc, Toei Animation wanted a name change on the basis that the series was going through a TimeSkip and a change of tone; manga creator Akira Toriyama suggested the name "Dragon Ball Z", as Z was the last letter of the alphabet. Toriyama himself never agreed with a name change to begin with, nor did the aforementioned arcs become the last, so letter Z lost its meaning.[[/note]] GT stands for Grand Tour according to the company.
* ''Anime/PowerpuffGirlsZ'', the anime adaptation of the western series ''WesternAnimation/ThePowerpuffGirls1998'', as opposed to the original's Chemical X, they use chemical Z.
* ''Anime/SonicX'', the adaptation for popular video game series ''VideoGame/SonicTheHedgehog'' from a story arc in ''VideoGame/SonicAdventure'' with [[MyFriendsAndZoidberg Chris Thorndyke]].

* ''Franchise/YuGiOh'' manga adaptation has ''Manga/YuGiOhR'', and the anime sequel goes by name ''Anime/YuGiOhGX''.
* ''Anime/SailorMoon'' has ''Sailor Moon R'' (the second season) and ''Sailor Moon S'' (the third season). The letters stand for "Romance" and "Super", respectively. In fact, "S" is actually ''pronounced'' "Super", as evidenced by the eyecatch and various printed materials (which in turn makes the subsequent season name, ''[=SuperS=]'', fall into DepartmentOfRedundancyDepartment).
* The eleventh movie of ''Manga/OnePiece'', ''Anime/OnePieceFilmZ''. Named after the initial of the main antagonist, Zephyr.
* ''Anime/MazingerZ'' is an inversion, it is indeed a part of the whole Mazinger franchise, but actually it is the title of the original manga that started everything.
* The direct sequel of ''Manga/GetterRobo'', Getter Robo G.
* ''Franchise/{{Gundam}}'' franchise has ''Anime/MobileSuitGundamZZ'' as the sequel of ''Anime/MobileSuitZetaGundam'', and there is also ''Anime/MobileFighterGGundam'' and ''Anime/AfterWarGundamX''. In a downplayed example, ''[[Anime/MobileSuitVictoryGundam Victory]]'' and ''[[Anime/MobileSuitGundamWing Wing]]'' sometimes get written as "V-Gundam" and "W-Gundam".
* ''Anime/SaberMarionetteJ'' is followed up by ''Saber Marionette J Again'', ''Saber Marionette J to X'', ''Anime/SaberMarionetteR'' and the manga-only ''Saber Marionette Z''. The letters are the initials of the places where the main characters are located: J stands for Japaness which is based on Japan, R is for Romana which is based on Rome, X means Xian which is based on China, and Z is the oddball as it's the initial of a new starring character, Zero. The first series (''J'') is followed up directly by ''J Again'' and then ''J to X'', whereas ''R'' and ''Z'' are distant sequels.
* The ''Literature/{{Slayers}}'' anime's fourth season is called "Slayers Revolution". The fifth season (which is just part 2 of the fourth) is called "Slayers Evolution-R". The reason why the R was moved from the front of the word to the back is not explained.

* The second season of ''[[LightNovel/NyarukoCrawlingWithLove Haiyore! Nyarko-San]]'' anime is called ''Haiyore! Nyarko-San W'', as a reference to ''Series/KamenRiderDouble'', while the OVA conclusion is tiled ''Haiyore! Nyarko-San F'', with the F standing for "[[GrandFinale Final]]".
* ''A Certain Scientific Railgun S'' and ''A Certain Scientific Railgun T'' are the followup seasons to the popular ''Manga/ACertainScientificRailgun'' staring Mikoto Misaka, funnily enough its sister series ''LightNovel/ACertainMagicalIndex'' used the [[NumberedSequel Roman Numerals]] for its second and third seasons.
* ''Anime/{{Symphogear}}'' did this for each of its sequel seasons. Season 2 was called ''G'', Season 3 was ''GX'', Season 4 was ''AXZ'', and Season 5 was ''XV''. The exact reason for why the seasons were named this way is known only to the creators.
* The second season of ''Manga/HimoutoUmaruChan'' was called ''Himouto! Umaru-chan '''R'''''.

* ''[[Film/KamenRiderXSuperSentaiSuperHeroTaisen Super Hero Taisen]]'' sequel is titled ''[[Film/KamenRiderXSuperSentaiXSpaceSheriffSuperHeroTaisenZ Super Hero Taisen Z]]'', increasing the super hero cast, adding up more Kamen Riders and Metal Heroes.
* The tenth and the latest movie chronogically in ''Franchise/FridayThe13th'' is titled ''Film/JasonX''. While the preceding films used the "part (roman numeral): subtitle" structure (such as ''Film/FridayThe13thPartVIITheNewBlood''), it's the only one with X alone. In the DVD featurette it's officially pronounced as "ex".
* In an example combining PunBasedTitle and a lampshade to the amount of FanService, the sequel to ''Film/Piranha3D'' is ''Film/Piranha3DD''.

* The DarkerAndEdgier MilestoneCelebration revival of ''[[Series/UltraSeven Ultraseven]]'' is titled ''[[Series/UltraSevenX Ultraseven X]]'', and the sequel to ''Series/UltramanGinga'' is titled ''Ultraman Ginga S''.
* ''Franchise/KamenRider''
** Older series in the franchise in the Showa era are fond of this, beginning with ''Series/KamenRiderX'', ''Film/KamenRiderZX'', ''Series/KamenRiderBlackRX'' (which also a sequel to ''Series/KamenRiderBlack)'', ''Film/KamenRiderZO'', to ''Film/KamenRiderJ'' and most of the letters are unexplained.

* The spiritual successor of ''Series/KaiketsuLionmaru'' series (1972) released in 2007 is titled ''Series/LionMaruG''.

* Idol group Momoiro Clover became Music/MomoiroCloverZ after their lineup change because the sub-leader stepped down.

* After 6 years of hiatus the subgroup Petitmoni of Music/HelloProject went active again with a new concept and name as Petitmoni V.

* The successor of Nintendo console UsefulNotes/{{Wii}}, UsefulNotes/WiiU. The U stands for "You", in analogy to Wii standing to "We".
* ''VideoGame/WarriorsOrochi'', pictured above, goes with a rather odd route: ''[[http://en.wikipedia.org/wiki/Musou_Orochi_Z Warriors Orochi Z]]'', ''Warriors Orochi 2'', and then ''Warriors Orochi 3'' (which is didn't exist in the japanese version because the second game is actually an updated port with a WordSequel title).
* ''Franchise/MegaMan''
** ''VideoGame/MegamanX'', the second series of the franchise, named after the future successor of original hero, X.
** In its further distant sequel, ''VideoGame/MegamanZX'', ZX is pronounced as ''Zekkusu''.
* ''Franchise/{{Pokemon}}''
** The titles of the Generation 6 games depart from their previously themes on colors (Red and Blue, Black and White) and precious materials (Gold and Silver, Ruby and Sapphire, Diamond and Pearl), as they goes with ''VideoGame/PokemonXAndY''.
** InUniverse, the name for the Mega Evolution also adds the letter from their game origin. For example, Charizard can evolve into Mega Charizard X or Mega Charizard Y.
** There is also ''VideoGame/PokemonXDGaleOfDarkness'', a sequel to ''VideoGame/PokemonColosseum''.
** While not a sequel, InUniverse, Porygon evolves into [=Porygon2=], which then evolves into [=Porygon-Z=] rather than "[=Porygon3=]."
* ''VideoGame/WanganMidnight'' was followed by ''Wangan Midnight R'', which makes hidden cars available, and makes challenge even more difficult.
** ''Maximum Tune 3'' was followed by ''WMMT 3 DX'', which added a few new cars, one new song, a new course, and 20 more stages (as if 80 wasn't enough!). And then ''WMMT 3 DX Plus'', which adds yet another course, more cars and four new songs (two of which are remixes).
** ''Maximum Tune 5'' has two region-specific versions with [[RegionalBonus regional-exclusive features]] [[BadExportForYou not available]] [[EarlyInstallmentWeirdness in each other]]. ''WMMT 5 DX'' addresses this issue by bringing back region-exclusive features from each other.
* ''VideoGame/SuperRobotWars'' franchise:
** As a MassiveMultiplayerCrossover, giving a nod to the franchise series it's based on by using their cool letter naming convention in nearly all of their games, such as ''VideoGame/SuperRobotWarsZ'', ''VideoGame/SuperRobotWarsEX'', ''VideoGame/SuperRobotWarsW'', ''VideoGame/SuperRobotWarsK'', ''VideoGame/SuperRobotWarsL'', ''VideoGame/SuperRobotWarsGC'' (and XO), ''VideoGame/SuperRobotWarsMX'', and ''VideoGame/SuperRobotWarsUX''.
** InUniverse itself, the original super robo is named Super Robot X.
* ''VideoGame/YaibaNinjaGaidenZ'' is a zombie slashing spin-off from an originally spin-off game ''VideoGame/NinjaGaiden''.
* ''VideoGame/GuiltyGear'' was given a follow-up in the form of ''Guilty Gear X''. However, WordOfGod has eventually relegated [=GGX=] and [=GGXX=] and its expansions to being a sideplot with the coming of ''Guilty Gear 2'', almost 10 years after the first game. ''Guilty Gear 2'' was then followed by ''[[SequelNumberSnarl Guilty Gear Xrd]]''.
* The vehicular combat spin-off of ''Jak and Daxter'' is titled ''Jak X'', it follows the franchise's odd title names from ''Jak and Daxter'', ''Jak II'' and ''Jak 3''.
* The fourth installment of the ''[[Franchise/{{Digimon}} Digimon World]]'' video game series is titled ''Digimon World X'' in Japan, but since its tie-in movie, Anime/DigimonXEvolution, [[NoExportForYou didn't see a release in US]], the US version of the game changed the title into ''VideoGame/DigimonWorld4''.
* In Japan, ''VideoGame/SuperSmashBros'' is known as ''Great Melee Smash Brothers''. The sequels, ''Melee'' and ''Brawl'', are known respectively as ''Great Melee Smash Brothers DX'' and ''Great Melee Smash Brothers X'' (DX stands for Deluxe). Subsequent installments avert this trope in favor of SuperTitle64Advance (''for Nintendo 3DS'' and ''for Nintendo Wii U'', just like the international versions) and WordSequel (''Special'', again like the international versions which use ''Ultimate'') respectively.
* ''VideoGame/MetalSlug X'' is an enhanced version of ''Metal Slug 2''. The series went back to NumberedSequels until ''Metal Slug XX'', the PSP port of ''Metal Slug 7''.
* ''{{VideoGame/GITADORA}}'' started as ''Guitar Freaks and VideoGame/DrumMania XG'', which was a spinoff of the original series. This was followed by [=XG2=] and [=XG3=] before becoming GITADORA.
* The sequel to ''VideoGame/AnotherCode: Two Memories'' was titled ''Another Code R: A Journey Into Lost Memories''.
* ''VideoGame/MonsterHunter'':
** In Japan, the expansions of the mainline games have letter G added to their original names, alluding to the inclusion of the HarderThanHard G Rank difficulty. For example, the expanded version of ''VideoGame/MonsterHunter3Tri'' was identified as ''Monster Hunter 3 G''; same for ''VideoGame/MonsterHunter4'' turning into ''Monster Hunter 4 G'' (in the international releases, WordSequel is used instead; hence ''Unite'' for [[VideoGame/MonsterHunterFreedom2 the expanded second-generation game]] and ''Ultimate'' for the expanded third and fourth generation games). Uniquely, the next installment is lettered from the get-go: ''Monster Hunter X'' (X standing for Cross), with the G Rank expansion being called ''Monster Hunter XX''; the international releases once again resort to Word Sequel (''[[VideoGame/MonsterHunterGenerations Generations]]'' and ''Generations Ultimate'' respectively). From ''VideoGame/MonsterHunterWorld'' onward, Word Sequel supersedes this trope worldwide for this series.
** ''VideoGame/MonsterHunterFrontier Z'' got its name for having the Z rank, itself placed even higher than the already difficult G rank.
* The [[ThematicSeries thematic sequel]] to ''VideoGame/XenobladeChronicles1'' is called ''VideoGame/XenobladeChroniclesX'' (the X stands for Cross).

* A sequel to ''VideoGame/SuperBomberman'' [[NonindicativeName (in name alone)]], the first ''Bomberman'' game since 2010 is named ''Super Bomberman R.''

* ''VideoGame/CastlevaniaRondoOfBlood'' was originally released in Japan as ''Akumajō Dracula X: Chi no Rondo'', being the first game set beyond Simon Belmont's timeline in the first two ''Castlevania'' games. The Super NES version, known as ''Castlevania: Dracula X'' in North America and ''Castlevania: Vampire's Kiss'' in Europe, became ''Akumajō Dracula XX'' (pronounced "double ecks" rather "ecks ecks").
* Played with in ''VideoGame/MortalKombatX''. It's the tenth mainline game in the series, but the X is always pronounced as the letter. It was also preceded by a [[VideoGame/MortalKombat9 title that wasn't numbered]].

* In Japan, the ''VideoGame/MonsterHunter'' expansions have letter G added to their original names, alluding to the inclusion of the HarderThanHard G Rank difficulty. For example, the expanded version of ''VideoGame/MonsterHunter3Tri'' was identified as ''Monster Hunter 3 G''; same for ''VideoGame/MonsterHunter4'' turning into ''Monster Hunter 4 G'' (in the international releases, WordSequel is used instead; hence ''Unite'' for [[VideoGame/MonsterHunterFreedom2 the expanded second-generation game]] and ''Ultimate'' for the expanded third and fourth generation games). Uniquely, the next installment is lettered from the get-go: ''Monster Hunter X'' (X standing for Cross), with the G Rank expansion being called ''Monster Hunter XX''; the international releases once again resort to Word Sequel (''[[VideoGame/MonsterHunterGenerations Generations]]'' and ''Generations Ultimate'' respectively). From ''VideoGame/MonsterHunterWorld'' onward, Word Sequel supersedes this trope worldwide for this series.

* Played with with ''VideoGame/MortalKombatX''. It's the tenth mainline game in the series, but the X is always pronounced as the letter. It was also preceded by a [[VideoGame/MortalKombat9 title that wasn't numbered]].

* Though the ''VideoGame/EtrianOdyssey'' games are numbered with the Roman system (except ''Untold 2''), the X in ''Etrian Odyssey X'' doesn't stand for 10 (it's the ninth game overall, and the sixth main one), but for Cross. In the West, the trope is replaced with WordSequel (''Etrian Odyssey Nexus'').

* ''LightNovel/TheSlayers'' 4th season is called "Slayers Revolution". The 5th season (which is just part 2 of the fourth) is called "Slayers Evolution-R". The reason why the R was moved from the front of the word to the back is not explained.

* ''Anime/PowerpuffGirlsZ'', the anime adaptation of the western series ''WesternAnimation/ThePowerpuffGirls'', as opposed to the original's Chemical X, they use chemical Z.

* ''[[Film/KamenRiderXSuperSentaiSuperHeroTaisen Super Hero Taisen]]'' sequel is titled ''[[Film/KamenRiderXSuperSentaiXSpaceSheriffSuperHeroTaisenZ Super Hero Taisen Z]]'', bringing the super hero cast UpToEleven, adding up more Kamen Riders and Metal Heroes.

* In Japan, the ''VideoGame/MonsterHunter'' expansions have letter G added to their original names, alluding to the inclusion of the HarderThanHard G Rank difficulty. For example, the expanded version of ''Monster Hunter 3'' was identified as ''Monster Hunter 3 G''; same for ''Monster Hunter 4'' turning into ''Monster Hunter 4 G'' (in the international releases, WordSequel is used instead; hence ''Unite'' for the expanded second-generation game and ''Ultimate'' for the expanded third and fourth generation games). Uniquely, the next installment is lettered from the get-go: ''Monster Hunter X'' (X standing for Cross), with the G Rank expansion being called ''Monster Hunter XX''; the international releases once again resort to Word Sequel (''Generations'' and ''Generations Ultimate'' respectively). From ''VideoGame/MonsterHunterWorld'' onward, Word Sequel supersedes this trope worldwide for this series.

* ''A Certain Scientific Railgun S'' and the upcoming ''A Certain Scientific Railgun T'' are the followup seasons to the popular ''Manga/ACertainScientificRailgun'' staring Mikoto Misaka, funnily enough its sister series ''LightNovel/ACertainMagicalIndex'' used the [[NumberedSequel Roman Numerals]] for its second and third seasons.

* ''Anime/SenkiZesshouSymphogear'' did this for each of its sequel seasons. Season 2 was called ''G'', Season 3 was ''GX'', Season 4 was ''AXZ'', and Season 5 was ''XV''. The exact reason for why the seasons were named this way is known only to the creators.

** In its further distant sequel, ''VideoGame/MegamanZX'', ZX is [[ItIsPronouncedTroPAY pronounced as ''Zekkusu'']].

* The [[ThematicSeries thematic sequel]] to ''VideoGame/XenobladeChronicles'' is called ''VideoGame/XenobladeChroniclesX'' (the X stands for Cross).

* ''Franchise/{{Gundam}}'' franchise has ''Anime/MobileSuitGundamZZ'' as the sequel of ''Anime/MobileSuitZetaGundam'', and there is also ''MobileFighterGGundam'' and ''Anime/AfterWarGundamX''. In a downplayed example, ''[[Anime/MobileSuitVictoryGundam Victory]]'' and ''[[Anime/MobileSuitGundamWing Wing]]'' sometimes get written as "V-Gundam" and "W-Gundam".

* ''Franchise/{{Gundam}}'' franchise has ''Anime/MobileSuitGundamZZ'' as the sequel of ''Anime/MobileSuitZetaGundam'', and there is also ''Anime/AfterWarGundamX''.

* The second season of ''LightNovel/HaiyoreNyarkoSan'' anime is called ''Haiyore! Nyarko-San W'', as a reference to ''Series/KamenRiderDouble'', while the OVA conclusion is tiled ''Haiyore! Nyarko-San F'', with the F standing for "[[GrandFinale Final]]".

* ''Manga/YondemasuyoAzazelsan'' has the second season aired in 2013 under the name ''Yondemasuyo, Azazel-san Z''.

* ''[[Anime/DemashitaPowerpuffGirlsZ Powerpuff Girls Z]]'', the anime adaptation of the western series ''WesternAnimation/ThePowerpuffGirls'', as opposed to the original's Chemical X, they use chemical Z.

* ''Franchise/{{Gundam}}'' franchise has ''Anime/GundamZZ'' as the sequel of ''Anime/MobileSuitZetaGundam'', and there is also ''Anime/AfterWarGundamX''.

[[caption-width-right:195:Suddenly Z]]

* In Japan, ''VideoGame/SuperSmashBros'' is known as ''Great Melee Smash Brothers''. The sequels, ''Melee'' and ''Brawl'', are known respectively as ''Great Melee Smash Brothers DX'' and ''Great Melee Smash Brothers X'' (DX stands for Deluxe). Subsequent installments avert this trope in favor of SuperTitle64Advance (''for Nintendo 3DS'' and ''for Nintendo Wii U'', just like the internatuonal versions) and WordSequel (''Special'', again like the international versions which use ''Ultimate'') respectively.

* In Japan, the ''VideoGame/MonsterHunter'' expansions have letter G added to their original names, alluding to the inclusion of the HarderThanHard G Rank difficulty. For example, the expanded version of ''Monster Hunter 3'' was identified as ''Monster Hunter 3 G''; same for ''Monster Hunter 4'' turning into ''Monster Hunter 4 G'' (in the international releases, WordSequel is used instead; hence ''Unite'' for the expanded second-generation game and ''Ultimate'' for the expanded third and fourth generation games). Uniquely, the next installment is lettered from the get-go: ''Monster Hunter X'' (X standing for Cross), with the G Rank expansion being called ''Monster Hunter XX''.

* The season sequels of the ''Franchise/DragonBall'' anime series are titled ''Anime/DragonBallZ'' and ''Anime/DragonBallGT''. Z is also used [[{{Woolseyism}} in certain dubs]] to name the protagonists "the Z Fighters", but what Z means or why they'd need a group name for a loosely-affiliated group of friends and rivals is never explained within the show.[[note]]The real-life explanation is that, since Toriyama was thinking of concluding the story soon whilst in the middle of the Saiyan arc, Toei Animation wanted a name change on the basis that the series was going through a TimeSkip and a change of tone; manga creator Akira Toriyama suggested the name "Dragon Ball Z", as Z was the last letter of the alphabet. Toriyama himself never agreed with a name change to begin with, nor did the aforementioned arcs become the last, so letter Z lost its meaning.[[/note]] GT stands for Grand Tour according to the company.

* ''Anime/SenkiZesshouSymphogear'' did this consistently with ''Symphogear G'' and ''GX'', but the fourth season ditched the "G" for ''Symphogear AXZ''. The fifth season will presumably have ''four'' letters, and it's hard to guess which ones.

* A Certain Scientific Railgun S is the sequel series to the popular ''Manga/ACertainScientificRailgun'' staring Mikoto Misaka, funnily enough its sister series ''LightNovel/ACertainMagicalIndex'' used the [[NumberedSequel Roman Numeral II]] for its second season.

* ''Anime/SonicX'', the adaptation for popular video game series ''Franchise/SonicTheHedgehog'' from a story arc in ''VideoGame/SonicAdventure'' with [[MyFriendsAndZoidberg Chris Thorndyke]].

* The successor of Nintendo console UsefulNotes/{{Wii}}, UsefulNotes/WiiU. The U stands for "[[CaptainObvious You]]", in analogy to Wii standing to "We".