X2 may refer to:

Mathimatics

• Square (algebra), also known as the "algebraic square", a concept in algebra
• Chi-square distribution, a theoretical probability distribution widely used in inferential statistics

y=x², for all integer values of 1≤x≤25. ... In probability theory and statistics, the chi-square distribution (also chi-squared or χ2  distribution) is one of the theoretical probability distributions most widely used in inferential statistics, i. ...

Films

• X2, a 2003 American movie also known as X-Men United
• XXX: State of the Union, also known as X2 or XXX², a 2005 American film

X2 is an action movie, first released in the United Kingdom on April 24, 2003, and in the United States on May 2, 2003. ...

Video games

• X2, a video game
• Final Fantasy X-2, an RPG video game
• Megaman X2, a platform game
• X²: The Threat, a space simulation game

X2, sometimes known as Project X-2 was a simple but technically impressive, arcade-style side scrolling shoot em up released during the Team17-Ocean collaboration era of video games that created the Worms series. ... Final Fantasy X-2 ) is a console role-playing game (RPG) developed and published by Square Enix Co. ... It has been suggested that this article or section be merged with Role-playing game (video games). ... ... A simple platform sequence from the game Wonder Boy Platform game, or platformer, is a video game genre characterized by jumping to and from suspended platforms or over obstacles. ... In its broadest definition, a space simulation is any software that simulates space and/or space flight. ...

Transportation craft

• Bell X-2, an experimental supersonic aircraft
• SpaceShipOne flight 17P, also known as "X2", the second Ansari X Prize flight
• Skycycle X-2, a rocket used by Evel Knievel
• HM Submarine X2, a Royal Navy submarine.
• Bathyscaphe Trieste II, also known as X-2, the US Navy bathyscaphe based on the Trieste
• X2 train, used for X2000 train system in Sweden
• X2 (PWC), a personal water craft

The Bell X-2 was an American research aircraft built to investigate flight characteristics in the Mach 2_3 range. ... Flight 17P of SpaceShipOne was a spaceflight in the Tier One program that took place on October 4, 2004. ... Skycycle X-2 was the rocket propelled motorcycle designed by former NASA engineer Robert Truax and ridden by Evel Knievel in his attempt to jump the Snake River Canyon near Twin Falls, Idaho on September 8, 1974. ... HM Submarine X2 was the name given to the former Italian submarine Galileo Galilei (captured by the Royal Navy in June 1940) when she was commissioned into the Royal Navy in June 1942 as a training submarine in the Far East. ... Trieste II Trieste II was designed by the Naval Electronic Laboratory, San Diego, California, as a successor to Trieste —the Navys pioneer bathyscape. ... X2 train used by SJ AB of Sweden X2 is the high speed train system operated by SJ (Swedish Railways) under the X 2000 brand name. ... The kawasaki X2 was the first mass produced sit down watecraft. ...

Other

• X2 (protocol), a pre-V.90 standard for 56k downstream modem communications
• Athlon 64 X2, the first dual-core desktop CPU manufactured by AMD
• X-2 is the name of the fictional space shuttle series in the Epcot attration, Mission: Space
• A two-lane PCI Express slot

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