X (消歧义)
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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
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 is a hypothesised planet in the outer solar system
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 (U.S. band), American rock band
- X (Australian band), Australian rock band
- X Japan, Japanese rock 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
- 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 former call sign for WMMM 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
- 99X (Atlanta), a modern rock radio station in Atlanta, Georgia now heard only on HD
- 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
WBSX, also known as 97.9X in Scranton/Wilkes-Barre/Hazelton
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 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
- 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