X2 may refer to: Computers X2 (protocol), a pre-V.90 standard for 56k downstream modem communications Athlon 64 X2, the first dual-core desktop CPU manufactured by AMD A two-lane PCI Express, slot A type of 10 Gigabit Ethernet, optical transceiver X2, a transport interface used to connect enodeBs in a LTE/4G network Vehicles and transportation Bathyscaphe Trieste II, also known as X-2, the US Navy bathyscaphe based on the Trieste Bell X-2, an experimental supersonic aircraft BMW X2, a SUV vehicle produced by BMW HMS X2, a Royal Navy submarine Kawasaki X2, a personal water craft Mitsubishi X-2 Shinshin, a Japanese experimental stealth fighter (formerly known as ATD-X) North Wing Sport X2, an American ultralight trike design Orba, also known as X-2, a planned British satellite Sikorsky X2, a prototype, coaxial high-speed helicopter SJ X2, used for the X 2000 train system in Sweden Skycycle X-2, a rocket used by Evel Knievel SpaceShipOne flight 17P, also known as X2, the second Ansari X Prize flight X-2 Dragonfly, the company designation of the Rotor-Craft XR-11 experimental helicopter of the late 1940s X2 (New York City bus) X2, a Metrobus route, in Washington, D.C. X-2 Rocket, the spacecraft used in Mission: Space in Epcot Center, Orlando, Florida Video games Dance Dance Revolution X2, a 2010 music video game for the PlayStation 2 Final Fantasy X-2, a 2003 role-playing video game Mega Man X2, a 1994 platform game X2: The Threat, a 2003 space simulation game X2 (video game), a 1997 video game X2, the main character in Star Wars Battlefront: Elite Squadron Film X2 (film), a 2003 sequel to the 2000 film X-Men XXX: State of the Union, also known as X2 or xXx²: The Next Level, a 2005 American film Other X2 (roller coaster), at Six Flags Magic Mountain Chi-squared distribution, a theoretical probability distribution in inferential statistics Square (algebra), also known as the algebraic square Nokia X2, feature phone/smartphone Sendo X2, a Series 60 mobile phone Sony Ericsson Xperia X2, smartphone Keyboard sold by Korg in the 1990s X-2 Counter Espionage Branch, counterintelligence branch of the Office of Strategic Services See also 2X (disambiguation)