X2 may refer to:

Computers

X2 (protocol) A modulator-demodulator or modem is a computer hardware device that converts data from a digital format into a format suitable for an analog transmission medium such as telephone or radio. A modem transmits data by Modulation#Digital modulati ...

, 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 PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e, is a high-speed serial computer expansion bus standard, designed to replace the older PCI, PCI-X and AGP bus standards. It is the common ...

, slot * A type of

10 Gigabit Ethernet 10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second. It was first defined by the IEEE 802.3ae-2002 standard. Unlike previous Eth ...

, 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 The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors, developed by Sikorsky Aircraft, that made its first flight in 2008 and was officially retired in 2011. Design and development Sikorsky developed the X2 heli ...

, 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 Rotorcraft XR-11, known by the company as the X-2 Dragonfly, was an American two-seat lightweight helicopter built in the 1940s for evaluation by the United States Air Force by the Rotorcraft Corporation of Glendale, California. Design and d ...

, 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 The North Wing Sport X2 is an American ultralight trike, designed and produced by North Wing Design of Chelan, Washington. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.Bayerl, Robby; Martin ...

, an American ultralight trike design * SJ X2, used for the X 2000 train system in Sweden *

X2 (New York City bus) The Metropolitan Transportation Authority (MTA) operates 80 express bus routes in New York City, United States. Generally, express routes operated by MTA Bus Company are assigned multi-borough (BM, BxM, QM, SIM) prefixes. Exceptions to this rule ...

, a bus route * X2, a Metrobus route, in Washington, D.C.

Video games

* ''

Dance Dance Revolution X2 (''DDR X2'') is a music video game, and a part of the '' Dance Dance Revolution'' series. The arcade version of ''DDR X2'' was revealed by Konami on November 20, 2009. The sequel to ''Dance Dance Revolution X'', X2 began public beta testing on ...

'', 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 Nokia X2 is a brand name used for several phones made by Nokia: *Nokia X2-00 feature phone, 2010 *Nokia X2-01 feature phone with a QWERTY keyboard, 2011 * Nokia X2-02 feature phone, 2012 *Nokia X2-05 feature phone, 2011 *Nokia X2 (2014), Android sma ...

, feature phone/smartphone * Sendo X2, a Series 60 mobile phone *

Sony Ericsson Xperia X2 The Xperia X2 (internal codename Vulcan), announced in September 2009, is a smartphone of the Xperia series by Sony Ericsson. It is the successor to the X1. Features include a 3.2-inch touchscreen, a sliding arc keyboard, 8.1 MP camera, Wi ...

, smartphone

Other

X2 (roller coaster) X2 (formerly known as X) is a steel roller coaster operating at Six Flags Magic Mountain in Valencia, California. It is the world's first 4th Dimension roller coaster and was the final roller coaster conceived and installed by ride manufacturer ...

, at Six Flags Magic Mountain * Chi-squared distribution, a theoretical probability distribution in inferential statistics *

Square (algebra) In mathematics, a square is the result of multiplication, multiplying a number by itself. The verb "to square" is used to denote this operation. Squaring is the same as exponentiation, raising to the power 2 (number), 2, and is denoted by a ...

, 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