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X

X can refer to:
  • The X-Universe series, a long-running series of wide open sandbox games.
  • X, a punk band.
  • X/1999, a manga series referred to as X in Japan.note 
  • X, a comic book series by Dark Horse Comics.

Tropes brought to you by the letter X:

You may also have been looking for the Turn-Based Tactics series X-COM.