X

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 also used as the vector or cross product

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

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 anime film and television series adapted from the manga of the same name
• The X (TV series), a Canadian children's television program produced by the Canadian Broadcasting Corporation
• The X's, an American animated television series

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

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 the album, Christian compilation album series released annually by Tooth and Nail Records since 2004

Bands

• X (American band), American punk band
• X (Australian band), Australian alternative band
• X Japan, Japanese metal band

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

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
• 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

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 avantgarde composer John Cage
• X, A Quartely Review of Literature and the Arts 1959–1962, edited by David Wright & 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 commitement 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

This disambiguation page lists articles associated with the same Latin letter. If an internal link led you here, you may wish to change the link to point directly to the intended article.