X2
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X2 may refer to:
- X2, a 2003 movie also known as X-Men United
- Bell X-2, an experimental supersonic aircraft
- Trieste II, the US Navy bathyscaphe based on the Trieste, and called X-2
- Final Fantasy X-2, a video game
- X²: The Threat, another video game
- X2 (Chipset), the standard chipset for 56k downstream modem communications
- X2 train, used for X2000 train system in Sweden
- SpaceShipOne flight 17P, the second Ansari X Prize flight, which is also known as X2.
- xXx: State of the Union, or xXx 2 or X2
- Skycycle X-2 - Evil Knievel's rocket
Additionally, X² may refer to:
- an algebraic square
- the Chi-square distribution in statistical analysis