X (disambiguation)

X is the twenty-fourth letter of the Latin alphabet.

X may also refer to

Language

• Chi (letter), the twenty-second letter of the Greek alphabet, often used to abbreviate "Christ"
• Kha, a letter in the Cyrillic alphabet
• Ḫāʼ, a letter in the Arabic alphabet

Mathematics

• X is the Roman numeral for 10
• x is a common variable for unknown or changing concepts in mathematics
• × is used as the multiplication sign in mathematics, also noted ✕
• × is used as the vector or cross product
• x is an axis in the Cartesian coordinate system

Science

• In astronomy, X stands for a comet of unknown orbit
• In electronics, X stands for reactance, the imaginary part of electrical impedance
• In biology, × (or x) is often used in binomial nomenclature as part of a hybrid name
• X band, part of the microwave band of the electromagnetic spectrum
• X chromosome, one of the two sex-determining chromosomes in many animal species, including mammals
• Planet X, a hypothesised planet in the outer solar system
• X (charge), a conserved quantum number in particle physics
• Extension (x), the change in length of wire when force is applied to a it under Hooke's Law

Surname

• Little X, also known as Lil X, a Canadian music video director.
• Malcolm X, human rights activist.
• Michael X, civil rights activist.

Computing

• X, short for the X Window System, a client-server display protocol often used in UNIX environments
• X Window System protocols and architecture, rules for communication between the former client and server
• X (writing speed), the speed at which data is written to an optical disc
• Mac OS X, the current graphical operating system for Apple hardware
• X (file format), file format used by DirectX

Media

• X-rated, a rating given to films suitable for an adult-only audience
• X (1963 film), subtitled The Man with the X-Ray Eyes, an American science-fiction film
• X (anime), a Japanese manga, anime film and anime television series
• The X (TV series), a Canadian children's television program produced by the Canadian Broadcasting Corporation
• The X's, an American animated television series
• X (magazine), a quarterly review of literature and the arts.
• X magazine, a pop music magazine launched in the UK in 2010 about The X Factor
• Kamen Rider X, a Japanese television series and part of the Kamen Rider franchise
• X'ed, to be the victim of a hidden camera prank on The Jamie Kennedy Experiment

Comics

• X (manga), a Japanese manga series by Clamp
• X (Dark Horse Comics), a character and series by Dark Horse Comics
• X (Marvel Comics), a mutant character appearing in Marvel Comics

Video games

• X (game series), a science fiction space simulator series by Egosoft
• X (handheld game), an early 3D game for Nintendo's Game Boy console released only in Japan
• X (Xbox show), an annual trade show hosted by Microsoft to showcase Xbox merchandise
• Dance Dance Revolution X, a music video game by Konami
• Mega Man X (character), the protagonist in the Mega Man X video game series

Music

Albums

• X (Trace Adkins album), released in 2008 by American country music artist Trace Adkins
• X (Kylie Minogue album), released in 2007 by Australian dance-pop singer Kylie Minogue
• X (K-Ci and JoJo album), released in 2000 by American R&B duo K-Ci and JoJo
• X (Kristeen Young album), released in 2004 by American rock singer Kristeen Young
• X (INXS album), released in 1990 by Australian rock band INXS
• X (Def Leppard album), released in 2002 by British rock band Def Leppard
• X (Liberty X album), released in 2005 by British pop vocal group Liberty X
• X (Klaus Schulze album), released in 1978 by German electronic musician Klaus Schulze
• X (Anna Vissi album), released in 2002 by Greek singer Anna Vissi
• X (Spock's Beard album), released in 2010 by American progressive rock band Spock's Beard
• X the album, Christian compilation album series released annually by Tooth and Nail Records since 2004

Bands and artists

• X (American band), American punk band
• X (Australian band), Australian alternative band
• X Japan, Japanese metal band
• Shaun Ryder sometimes uses the pseudonym X

Songs

• "X" (Xzibit song), a song from the 2000 album Restless by Xzibit
• "X" (Liberty X song), a 2006 song from the album X by Liberty X
• "X", a song from the album Toxicity by System of a Down
• "X", a song from the album Pain Is Love by Ja Rule featuring Missy Elliott & Tweet

Radio

• KCXX-FM, also known as "The 'X' at 103.9 FM", a rock n' roll radio station in the Inland Empire, Southern California
• KTHX-FM, also known as "The 'X' at 100.1 FM", a rock n' roll radio station in Reno, Nevada
• WXLV, also known as "90.3 "The X"", a college radio station in Allentown Pennsylvania
• KXXR, also known as "93X", an active rock radio station in Minneapolis, Minnesota
• WBSX, also known as 97.9X in Scranton/Wilkes-Barre/Hazelton, Pennsylvania
• WNFZ, also known as "94.3 the X", a modern rock radio station in Knoxville, Tennessee
• WQXA, also known as 105.7 "The 'X'", a modern rock radio station in Harrisburg, Pennsylvania
• WRAX, also known as "The 'X' at 100.5", a former call sign for WMMM radio station in Birmingham, Alabama
• WSUN-FM, also known as "97X", a modern rock radio station in Tampa, Florida
• WXDX-FM, also known as "The 'X' at 105.9", a modern rock radio station in Pittsburgh, Pennsylvania
• WXEG, also known as "103.9 The 'X'", a modern rock radio station in Dayton, Ohio
• WXLP, also known as "97X," a classic hits station in the Quad Cities, Iowa-Illinois, licensed to Moline, Illinois
• 99X (Atlanta), a modern rock radio station in Atlanta, Georgia now heard only on HD
• XETRA-FM, also known as "91X", a modern rock radio station in San Diego, California
• The initial letter of many stations originating in Mexico
• WROX-FM, also known as "96X," a modern rock radio station in Norfolk, Virginia

Other uses

• X mark, a common written symbol of negation or affirmation
• X, the pseudonym under which the "X Article", formally titled "The Sources of Soviet Conduct", was published in Foreign Affairs magazine
• X (automobile), a French car produced in 1908 and 1909
• X² (roller coaster), the world's first spinning coaster, at Six Flags Magic Mountain
• X (John Cage book), subtitled Writings ’79–’82, a book by avant garde composer John Cage
• X, A Quartely Review of Literature and the Arts 1959–1962, edited by David Wright and Patrick Swift
• X (The X-Files), a character from the television series The X-files
• x is a handwritten symbol of a kiss
• x is a symbol in the International Phonetic Alphabet for the voiceless velar fricative
• X is the stock symbol for United States Steel Corporation
• The X is the nickname for École Polytechnique, a French engineering school
• The X may refer to the Xcel Energy Center, an arena in Saint Paul, Minnesota
• X and ecstasy are street names for the drug MDMA
• X, surname often assumed by members of the Nation of Islam
• X, ring name of wrestler Carl Ouellet
• X is the symbol for a strike in bowling
• X is used often by straight edgers to show their commitment to their lifestyle.
• ╳ is a box drawing character
• Ⓧ may refer to a typographical symbol in Japanese resale price maintenance
• X is sometimes used in acronyms and other abbreviations to represent the word "cross"
• X is the legal signature of an illiterate person

See also

• Chi (disambiguation)
• Ex (disambiguation)
• Mister X (disambiguation)
• Project X (disambiguation)
• Saltire
• XX (disambiguation)
• XXX (disambiguation)
• XXXX (disambiguation)
• X marks the spot