X2
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
Aircraft, spacecraft and rockets
- Bell X-2, an experimental supersonic aircraft
- Mitsubishi X-2 Shinshin, a Japanese experimental stealth fighter (formerly known as ATD-X)
- Orba, also known as X-2, a planned British satellite
- Sikorsky X2, a prototype, coaxial high-speed helicopter
- 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
- X-2 Rocket, the spacecraft used in Mission: Space in Epcot Center, Orlando, Florida
Watercraft
- Bathyscaphe Trieste II, also known as X-2, the US Navy bathyscaphe based on the Trieste
- HMS X2, a Royal Navy submarine
- Kawasaki X2, a personal water craft
Other vehicles and transportation
- BMW X2, a SUV vehicle produced by BMW
- North Wing Sport X2, an American ultralight trike design
- SJ X2, used for the X 2000 train system in Sweden
- X2 (New York City bus), a bus route
- X2, a Metrobus route, in Washington, D.C.
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
Phones
- Nokia X2, feature phone/smartphone
- Sendo X2, a Series 60 mobile phone
- Sony Ericsson Xperia X2, smartphone
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
- Keyboard sold by Korg in the 1990s
- X-2 Counter Espionage Branch, counterintelligence branch of the Office of Strategic Services
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