X (disambiguation)

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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

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 is a hypothesised planet in the outer solar system

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-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

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, an upcoming music video game by Konami

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

X (U.S. band), a punk rock band formed in Los Angeles in 1977
X (Australian band), a punk rock band formed in Sydney in 1977
X Japan, a Japanese metal band formed in 1982, disbanded in 1997, reunited in 2007

KTHX-FM, also known as "The 'X' at 100.1 FM", a rock n' roll radio station in Reno, Nevada
KCXX-FM, also known as "The 'X' at 103.9 FM", a rock n' roll radio station in the Inland Empire, Southern California
KXXR, also known as "93X", an active rock radio station in Minneapolis, MN
WXDX-FM, also known as "The 'X' at 105.9", a modern rock radio station in Pittsburgh, Pennsylvania
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 modern rock radio station in Birmingham, Alabama
WXEG, also known as "103.9 The 'X'", a modern rock radio station in Dayton, Ohio
WNFZ, also known as "94.3 the X", a modern rock radio station in Knoxville, Tennessee
WSUN-FM, also known as "97X", a modern rock radio station in Tampa, FL
XETRA-FM, also known as "91X", a modern rock radio station in San Diego, California
The initial letter of many stations originating in Mexico

X mark, a common written symbol of negation or affirmation
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 (The X-Files), a character from the television series The X-files
x is a handwritten symbol of a kiss
x is the 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, i.e Malcolm X, Clarence 13X
X, ring name of wrestler Carl Ouellet
X is the symbol for a strike in bowling
╳ is a box drawing characters
Ⓧ may refer to a typographical symbol in Japanese resale price maintenance