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* When ever the US Air Force has built a new aircraft that's still in the experimental stages, there's almost always always an "X" in its designation. When it is through the experimental stages and ready to be put into production, the "X" is taken out and replaced with a classifying letter (i.e. the Lockheed Martin X-35 became the F-35 Lightning II). The other branches do the same with their experimental weapons systems, though slightly differently (the classifying letter is usually already part of its name; for instance, the [[RareGuns Heckler & Koch XM8]] would have become just the M8, had it been adopted). This association is so pronounced that experimental aircraft (especially ones designed for the US military) are often known simply as "X-planes." The Air Force used to do that too, such as in the case of the XB-52. (And the Army Air Force before that, such as with the XP-51.) What was done with the F-35 is just weird, considerig the "F" ("fighter") series is only up to F-23.

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* When ever the US Air Force has built a new aircraft that's still in the experimental stages, there's almost always always an "X" in its designation. When it is through the experimental stages and ready to be put into production, the "X" is taken out and replaced with a classifying letter (i.e.(e.g. the Lockheed Martin X-35 became the F-35 Lightning II). The other branches do the same with their experimental weapons systems, though slightly differently (the classifying letter is usually already part of its name; for instance, the [[RareGuns Heckler & Koch XM8]] would have become just the M8, had it been adopted). This association is so pronounced that experimental aircraft (especially ones designed for the US military) are often known simply as "X-planes." The Air Force used to do that too, such as in the case of the XB-52. (And the Army Air Force before that, such as with the XP-51.) What was done with the F-35 is just weird, considerig the "F" ("fighter") series is only up to F-23.

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** In an example that is literal to the trope title, the Secret Reports of ''VideoGame/KingdomHeartsIII'' mention [[spoiler:a mysterious girl, implied to be a character from ''VideoGame/KingdomHeartsX'', who was used as a test subject in the experiments of Ansem the Wise's apprentices. Suffering amnesia and unable to recall her own name, she was referred to only as "Subject X"]].


->''"[[http://en.wikipedia.org/wiki/Chi_(letter) Chi]]... A most ancient letter. Some say "kye", but the meaning is the same. Death--a letter that spells endings."''

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->''"[[http://en.wikipedia.org/wiki/Chi_(letter) Chi]]...->''"'χ'... A most ancient letter. Some say "kye", [[http://en.wikipedia.org/wiki/Chi_(letter) 'kye']], but the meaning is the same. Death--a letter that spells endings."''


->''"[[http://en.wikipedia.org/wiki/Chi_(letter) Chi]] - A most ancient letter. Some say "kye", but the meaning is the same. Death--a letter that spells endings."''

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->''"[[http://en.wikipedia.org/wiki/Chi_(letter) Chi]] - Chi]]... A most ancient letter. Some say "kye", but the meaning is the same. Death--a letter that spells endings."''


->''"A most ancient letter. Some say [[http://en.wikipedia.org/wiki/Chi_(letter) "chi"]], but the meaning is the same. Death--a letter that spells endings."''

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->''"A most ancient letter. Some say [[http://en.->''"[[http://en.wikipedia.org/wiki/Chi_(letter) "chi"]], Chi]] - A most ancient letter. Some say "kye", but the meaning is the same. Death--a letter that spells endings."''


[[folder: Anime and Manga ]]

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[[folder: Anime and Manga ]][[folder:Anime & Manga]]



* The ''Franchise/{{Gundam}}'' franchise, keeping with RealLife, gives prototype [[HumongousMecha mobile suits]] model numbers that contain the letter X. More often than not, these machines are {{Super Prototype}}s -- the biggest example being the [[Series/MobileSuitGundam original RX-78-2 Gundam]].

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* The ''Franchise/{{Gundam}}'' franchise, keeping with RealLife, gives prototype [[HumongousMecha mobile suits]] model numbers that contain the letter X. More often than not, these machines are {{Super Prototype}}s -- the biggest example being the [[Series/MobileSuitGundam [[Anime/MobileSuitGundam original RX-78-2 Gundam]].



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* [[NoBudget Low budget]] sci fi clunker ''The Man From Planet X''.

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* [[NoBudget Low budget]] sci fi sci-fi clunker ''The Man From from Planet X''.



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* [[WebVideo/BumReviews Chester A. Bum]] explains that he doesn't want to spoil the celebrity cameo from ''Film/{{Zombieland}}'', and so dubs him Mr. X for a short while.
* When a mystery guest commentator shows up during LetsPlay/{{pokecapn}}'s ''VideoGame/SonicUnleashed'' marathon, LetsPlay/{{medibot}} terms him "X".



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[[folder: Western Animation ]][[folder:Web Videos]]
* ''WebVideo/BumReviews'': Chester A. Bum explains that he doesn't want to spoil the celebrity cameo from ''Film/{{Zombieland}}'', and so dubs him Mr. X for a short while.
* When a mystery guest commentator shows up during LetsPlay/{{pokecapn}}'s ''VideoGame/SonicUnleashed'' marathon, LetsPlay/{{medibot}} terms him "X".
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[[folder:Western Animation]]



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* Numerous masked {{jobber}}s or managers named "Mr. X" or "Dr. X". This wasn't always the case, as Mr. X was undefeated until the tail end of 1953 in Berlin, Dr. X was World Heavyweight Champion of Nebraska based All Star Wrestling during 1959, Gene Kiniski and Mr. X were the Canadian TagTeam Champions in Vancouver during 1963 then Dr. X was World Champion in Montreal during 1971. However, TheGimmick(s) became used by one too many wrestlers and became associated with losers, rather than fearsome mysterious men, though even at their height Dr/Mr X would almost always end up losing [[HumiliatingWager a mask vs mask/hair/title/career match]] before another popped up. It wasn't just men either, as their were various Lady X and Madame X around.

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* Numerous masked {{jobber}}s or managers named "Mr. X" or "Dr. X". This wasn't always the case, as Mr. X was undefeated until the tail end of 1953 in Berlin, Dr. X was World Heavyweight Champion of Nebraska based All Star Wrestling during 1959, Gene Kiniski and Mr. X were the Canadian TagTeam Champions in Vancouver during 1963 then Dr. X was World Champion in Montreal during 1971. However, TheGimmick(s) became used by one too many wrestlers and became associated with losers, rather than fearsome mysterious men, though even at their height Dr/Mr X would almost always end up losing [[HumiliatingWager a mask vs mask/hair/title/career match]] before another popped up. It wasn't just men either, as their there were various Lady X X, and Madame X around.around. Dr. X would sometimes have a Nurse X [[EvilMinion minion]] as well.



* Wrestling/{{TNA}} has the X Division, its official "no limits" division, as opposed to its heavyweight division which had a minimum weight limit. It's essentially a hardcore division but not in the GarbageWrestler sense, in that more "high spots" are to be expected sense. Despite having competitors approaching 300 lbs and a celebrated champion in Wrestling/SamoaJoe, a weight limit was eventually put in place for those who wanted to compete in the division, temporarily turning it into a glorified cruiser weight division until it was lifted.[[note]]The weight limit was an attempt to apologize to fans for putting the belt on Abyss, who wasn't a bad wrestler but wasn't what people watched X Division matches for, he being neither springy, quick nor very technical.[[/note]]

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* Wrestling/{{TNA}} has the X Division, its official "no limits" division, as opposed to its heavyweight division division, which had a minimum weight limit. It's essentially a hardcore division but not in the GarbageWrestler sense, in that more "high spots" are to be expected sense. Despite having competitors approaching and surpassing 300 lbs and lbs, including a celebrated champion in Wrestling/SamoaJoe, a weight limit was eventually put in place for those who wanted to compete in the X division, temporarily turning it into a glorified cruiser weight division until it was lifted.[[note]]The weight limit was an attempt to apologize to fans for putting the belt on Abyss, Wrestling/{{Abyss}}, who wasn't a bad wrestler but wasn't what people watched X Division matches for, he being neither springy, quick nor quick, nor very technical.[[/note]]


* ''VideoGame/FateGrandOrder'': Saber Arturia has two alternate versions of herself with strange origins and motives. An Assassin called Mysterious Heroine X, and a Berserker called Mysterious Heroine X Alter.

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* ''VideoGame/FateGrandOrder'': Saber Arturia has two alternate versions of herself with strange origins and motives. An Assassin called Mysterious Heroine X, and a Berserker called Mysterious Heroine X Alter.Alter, and a Foreigner called Mysterious Heroine XX.

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* In ''Mr. Twigg's Mistake'', the titular mistake involves falling asleep at the control panel of a cereal plant, so that one box is filled with an entire batch's dose of the mysterious "Vitamin X". That dose appears to gift a common mole with [[ItCanThink human-level intelligence]], vast growth, and amazing dexterity along the way.


** The series' overall BigBad is Xehanort, who has something of an obsession with the letter 'x'.
** Every member of Organization XIII has a name that is a SignificantAnagram of their original name with an X added in. The exceptions are [[spoiler: Xemnas and Xion, the former because he took someone else's identity and the latter because she isn't a Nobody and was originally created as a Sora replica.]] Interestingly the Japanese syllabary has no X, making their names "words that ''should not be pronouncable''", a la [[EldritchAbomination Cthulhu]].
** [[spoiler: The χ-Blade, the ultimate Keyblade]] in ''VideoGame/KingdomHeartsBirthBySleep''. And to add confusion, [[spoiler: it's based on the Greek letter "Chi," meaning it's pronounced exactly like "Keyblade." [[CaptainObvious It can get a little awkward when using verbal communication]]. ]]
** As of ''3D'', it turns out that [[spoiler:Xehanort used the X as a symbol for potential bodies in his massive GrandTheftMe plan. He calls it the "Recusant's Sigil", and considers anyone marked with it his property. He can even track people who wear it on their clothes - such as Sora's dream-world outfit.]]

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** The series' overall BigBad is Xehanort, who has something of an obsession with the letter 'x'.
** Every member of Organization XIII has a name that is a SignificantAnagram of their original name with an X "X" added in. The exceptions are [[spoiler: Xemnas and Xion, is a unique exception, as he used the former because he took someone else's name of a man whose identity and the latter because she isn't a Nobody and was originally created as a Sora replica.]] Interestingly he stole (Ansem). Interestingly, the Japanese syllabary has no X, "X", making their names "words words that ''should not be pronouncable''", pronouncable'', a la [[EldritchAbomination Cthulhu]].
** [[spoiler: The χ-Blade, χ-blade, with the ultimate Keyblade]] significance of the letter {{discussed|Trope}} in ''VideoGame/KingdomHeartsBirthBySleep''. And to To add to the confusion, [[spoiler: it's based on the Greek letter "Chi," meaning it's "chi", yet pronounced exactly like the exact same way as "key", making it no sound different from "Keyblade." [[CaptainObvious It can get a little awkward when using verbal communication]]. ]]
communication]].
** As of ''3D'', it turns out that [[spoiler:Xehanort revealed in ''VideoGame/KingdomHearts3DDreamDropDistance'', [[spoiler:the letter "X" is known as the Recusant's Sigil, which Xehanort used to mark the X Organization's members as a symbol for potential bodies his vessels in his massive GrandTheftMe plan. He calls it the "Recusant's Sigil", and considers anyone marked with it his property. He can even track people who wear it on their clothes - clothes, such as Sora's dream-world outfit.]]


->''"A most ancient letter. Some say [[http://en.wikipedia.org/wiki/Chi_(letter) "chi,"]] but the meaning is the same. Death - a letter that spells endings."''

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->''"A most ancient letter. Some say [[http://en.wikipedia.org/wiki/Chi_(letter) "chi,"]] "chi"]], but the meaning is the same. Death - a Death--a letter that spells endings."''

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* An article in the April 11, 1953 edition of ''Billboard'' was about a new subsidiary label that [[Creator/RCARecords RCA Victor]] was establishing. Since the name of the label was not decided on yet, the article referred to it as Label "X". It seemed to have inspired RCA: the label was officially named "X" a few weeks later and kept that name for a few years before changing its name to Vik.

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* ''Series/{{Wiseguy}}'': Undercover agent Vinne Terranova is HauledBeforeASenateSubcommittee, but his superior Frank [=McPike=] insists that he testify behind a screen with his voice electronically altered, as he doesn't want Vinnie to blow his cover. An annoyed Vinnie goes into the bedroom, then reappears wearing a pillow case with eyeholes cut in it. "Is this how you want me to appear? Agent X?"

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* ''VideoGame/FateGrandOrder'': Saber Arturia has two alternate versions of herself with strange origins and motives. An Assassin called Mysterious Heroine X, and a Berserker called Mysterious Heroine X Alter.

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* [[UsefulNotes/{{Finland}}The Åland Islands]] were given the ISO country code AX, because all the fitting two letter codes starting with A, such as AL and AD, were already taken.

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