X is the 24th letter of the Latin alphabet. X may also refer to:

Art, entertainment, and media

Fictional entities

* ''X'' (Dark Horse Comics), a character and series * X (''Mega Man''), the main protagonist of the ''Mega Man X'' video game series * X (''The X-Files''), a television series character * Radio X, the fictional radio station broadcasting the ''Grand Theft Auto: San Andreas'' soundtrack * X, a symbol used on treasure maps in fiction to show the location of the hidden treasure * X Parasite, a central subject of the 2002 game ''

Metroid Fusion is an action-adventure game developed and published by Nintendo for the Game Boy Advance in 2002. It was developed by Nintendo Research & Development 1, which had developed the previous game in the series, ''Super Metroid'' (1994). Players contr ...

'' for the Game Boy Advance

Film

* ''X'' (1963 film), subtitled ''The Man with the X-Ray Eyes'', an American science-fiction film * ''X'' (1986 film), a Norwegian film directed by Oddvar Einarson * ''X'' (1996 film), an anime film directed by Rintaro * ''X'' (2022 film), an American-Canadian horror film distributed by A24 * ''

X the Unknown ''X the Unknown'' is a 1956 British science fiction horror film directed by Leslie Norman and starring Dean Jagger and Edward Chapman. It was made by the Hammer Film Productions company and written by Jimmy Sangster. The film is significant i ...

'', a 1956 British film * ''

X-Paroni ''X-Paroni'' (X-Baron) is a 1964 Finnish comedy and the debut of Spede Pasanen as a leading male role and debut as a co-writer and director of a full-length film. Plot summary The plot concerns a wealthy baron (Pasanen), who is so interested in f ...

'', a 1964 Finnish comedy film by Spede Pasanen * ''Malcolm X'' (1992 film), a film by Spike Lee promoted with the alternate title ''X'' * '' The X'', a 2001 film by American director Peter Hewitt * '' X: Night of Vengeance'', a 2011 film by Australian director Jon Hewitt * '' X: Past Is Present'', a 2015 Indian anthology film *

X rating An X rating is a rating used in various countries to classify films that have content deemed suitable only for adults. It is used when the violent or sexual content of a film is considered to be potentially disturbing to general audiences. Aust ...

, used to classify films suitable for an adult-only audience

Television

* ''

Kamen Rider X is a Japanese tokusatsu superhero television series. It was broadcast in 1974 on the Mainichi Broadcasting System and NET, now known as TV Asahi. It is the third entry in the Kamen Rider Series of tokusatsu shows. It starred Ryo Hayami in the ...

'', a Japanese series and part of the ''Kamen Rider'' franchise * ''

Ultraman X is a Japanese television series produced by Tsuburaya Productions. The 27th entry to the ''Ultra Series'', it is currently the last series to air as part of the ''Ultraman Retsuden, New Ultraman Retsuden'' programming block on TV Tokyo. On July 13 ...

'', a 2015 Japanese ''tokusatsu'' television series * ''The X'' (TV series), a Canadian children's program * ''

The X's ''The X's'' is an American animated television series created by Carlos Ramos for Nickelodeon. The series centers on a family of spies who must conceal their identity from the outside world, but often have trouble in doing so. It had a single ...

'', an American animated series *

WXSP-CD WXSP-CD (channel 15) is a low-power, Class A television station licensed to Grand Rapids, Michigan, United States, serving West Michigan as an affiliate of MyNetworkTV. It is owned by Nexstar Media Group alongside Grand Rapids–licensed NBC a ...

, a Grand Rapids, Michigan TV station branded as "The X" * ''X'' (TV series), a Japanese anime series * X, the production code for the 1966 ''Doctor Who'' serial '' The Ark''

Video games

* ''X'' (1992 video game) a 3D game for Nintendo's Game Boy console * ''X'' (game series), a science fiction space simulator series by Egosoft *

X (Xbox show) X (sometimes called the "X0 events") is an annually held trade show hosted by Microsoft, showcasing its Xbox Xbox is a video gaming brand created and owned by Microsoft. The brand consists of five video game consoles, as well as applicati ...

, an annual trade show hosted by Microsoft to showcase Xbox merchandise * ''

Mega Man X is a series of action platform video games released by Capcom. It is a sub-series of the ''Mega Man'' franchise. The first game was released on December 17, 1993 in Japan (January 1994 in North America) on the Super NES/Super Famicom; most of ...

'', a series of action-platform video games released by Capcom * ''Mega Man X'' (video game), the first game in the series * ''Pokémon X'', one of the two paired ''

Pokémon X and Y and are 2013 role-playing video games developed by Game Freak, published by The Pokémon Company and Nintendo for the Nintendo 3DS. They are the first installments in the sixth generation of the main ''Pokémon'' video game series. First a ...

'' games for the Nintendo 3DS

Literature

* ''X'' (Cage book), subtitled ''Writings ’79–’82'', by avant garde composer John Cage * ''X'' (magazine), a quarterly review of literature and the arts * ''X'' (manga), a 1992 Japanese manga, anime film, and anime television series * ''X'' (Grafton novel), 2015, by Sue Grafton * X (young adult novel), 2015, by Ilyasah Shabazz and Kekla Magoon * '' X: A Fabulous Child's Story'', a 1972 short story and 1978 picture book by Lois Gould * ''X: Or, Betty Shabazz v. The Nation'', a 2017 play by

Marcus Gardley Marcus Gardley (born 1977/1978) is an American poet, playwright and screenwriter from West Oakland, California. He is an ensemble member playwright at Victory Gardens Theater in Chicago and an assistant professor of Theater and Performance Stud ...

* '' 'X' Stands for Unknown'', a 1084 collection of nonfiction science essays by Isaac Asimov

Music

Performers

X (American band) X is an American punk rock band formed in Los Angeles. The original members are vocalist Exene Cervenka, vocalist-bassist John Doe, guitarist Billy Zoom and drummer D. J. Bonebrake. The band released seven studio albums from 1980 to 1993. Afte ...

, a punk band *

X (Australian band) X is an Australian punk rock band, formed in Sydney, New South Wales in 1977 founded by Ian Rilen, Steve Lucas, Ian Krahe and Steve Cafiero. The group was formed simultaneously to, and with no knowledge of, the Los Angeles group of the same ...

, a punk band *

X Japan was a Japanese rock band from Chiba, formed in 1982 by drummer and pianist Yoshiki and lead vocalist Toshi. Starting as a predominantly power/speed metal band with heavy symphonic elements, they later gravitated towards a progressive soun ...

, Japanese metal band, originally named X from 1982–1992

Albums

* ''X'' (Agnez Mo album), 2017 * ''X'' (Klaus Schulze album), 1978 * ''X'' (Gnags album), 1983 * ''X'' (INXS album), 1990 * ''X'' (K-Ci & JoJo album), 2000 * ''X'' (Def Leppard album), 2002 * ''X'' (Anna Vissi album), 2002 * ''X'' (Kristeen Young album), 2004 * ''

X the album The X series is a collection of compilation albums and DVDs released by BEC Recordings promoting Christian rock music from bands signed to Capitol Christian Music Group, specifically Tooth & Nail Records, Solid State Records, Gotee Records, Fo ...

'', Christian compilation album series starting in 2004 * ''X'' (Liberty X album), 2005 * ''X'' (Intocable album), 2005 * ''X'' (Fourplay album), 2006 * ''X'' (Kylie Minogue album), 2007 * ''X'' (Trace Adkins album), 2008 * ''X'' (Spock's Beard album), 2010 * ''X'' (Royal Hunt album), 2010 * ''X'' (Roll Deep album), 2012 * ''X'' (The 69 Eyes album), 2012 * ''X'' (Chris Brown album), 2014 * ''X'' (Ed Sheeran album) (read as "Multiply"), 2014 * ''X'' (The Driver Era album), 2019 * ''X'' (Ken Carson album), 2022 *

X (Lucki mixtape) ''X'' is the third mixtape by American hip hop recording artist Lucki Lucki Camel Jr. (born May 30, 1996) known mononymously as Lucki (stylized in all caps) is an American rapper and record producer from Chicago, Illinois. He came to public ...

, 2015 * X, a Philippine hip-hop album by

Ex Battalion Ex Battalion (colloquially abbreviated as Ex B) is a Filipino hip hop collective from Muntinlupa City, Philippines, primarily known for the hit singles "Hayaan Mo Sila" in 2017 and "No Games" in 2016. The group was originally formed as a rap b ...

* X (Nonpoint album), 2018 * '' X: The Godless Void and Other Stories'', 2020 by ...And You Will Know Us by the Trail of Dead * ''Ten'' (Sault album), (also styled ''X'') 2022

Operas

* ''

X, The Life and Times of Malcolm X ''X, The Life and Times of Malcolm X'' is an opera with music by Anthony Davis and libretto by Thulani Davis, to a story by Christopher Davis. It is based on the life of the civil rights leader Malcolm X. Performance history The opera premiered i ...

'', 1986

Songs

* "X" (21 Savage and Metro Boomin song) * "X" (Chris Brown song) * "X" (Jonas Brothers and Karol G song) * "X" (Liberty X song) * "X" (Nicky Jam and J Balvin song) * "X" (Poppy song) * "X" (Xzibit song) * "X", a song from the album '' The Circle'' by B'z * "X", a song from the album '' Neysluvara'' by Hatari * "X", a song from the album '' Undeniable'' by Hellyeah * "X", a song from the album ''

Pain Is Love ''Pain Is Love'' is the third studio album by American rapper Ja Rule. Executive produced by Irv Gotti, it was released on October 2, 2001 by Murder Inc. Records and distributed by Def Jam Recordings. Although, the album received a mixed receptio ...

'' by Ja Rule featuring Missy Elliott and Tweet * "X", a song from the album ''

Future History A future history is a postulated history of the future and is used by authors of science fiction and other speculative fiction to construct a common background for fiction. Sometimes the author publishes a timeline of events in the history, whi ...

'' by Jason Derulo * "X", a song from the album ''

Luv Is Rage 2 ''Luv Is Rage 2'' is the debut studio album by American rapper Lil Uzi Vert. It was released on August 25, 2017, through Generation Now and Atlantic Records. The album serves as a sequel to Uzi's commercial debut mixtape ''Luv Is Rage'' (2015). It ...

'' by Lil Uzi Vert * "X", a song from the album ''

The Magic Position ''The Magic Position'' is the third studio album by English singer-songwriter Patrick Wolf. It was released on 26 February 2007. The album features collaborations with Marianne Faithfull and Edward Larrikin of Larrikin Love as well as backing ...

'' by Patrick Wolf * "X", a song from the album ''

Angels & Demons ''Angels & Demons'' is a 2000 bestselling mystery- thriller novel written by American author Dan Brown and published by Pocket Books and then by Corgi Books. The novel introduces the character Robert Langdon, who recurs as the protagonist of Bro ...

'' by Peter Andre * "X", a song from the album ''

Black Panther A black panther is the melanistic colour variant of the leopard (''Panthera pardus'') and the jaguar (''Panthera onca''). Black panthers of both species have excess black pigments, but their typical rosettes are also present. They have been d ...

'' by ScHoolboy Q, 2 Chainz, Saudi, and Kendrick Lamar * "X", a song from the album ''

Toxicity Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a subst ...

'' by System of a Down * "X", a song from the album '' Blue Blood'' by X Japan

Stations

KHTI KHTI (103.9 FM, Hot 103.9) is a commercial radio station licensed to Lake Arrowhead, California, broadcasting to the Riverside-San Bernardino, California, area since 1978. KHTI airs a Hot AC music format. It is owned by All Pro Broadcasting, a c ...

, formerly KCXX, known as "The 'X' at 103.9 FM", a rock n' roll radio station in the Inland Empire, Southern California *

KWEE KWEE (100.1 FM, "100.1 We FM") is a commercial radio station licensed to Dayton, Nevada, and serving the Reno metropolitan area and Lake Tahoe. It is owned by Lotus Communications and broadcasts an adult hits radio format. The radio studi ...

, formerly known as "The 'X' at 100.1 FM", a rock n' roll radio station in Reno, Nevada *

WNFZ WNFZ (94.3 MHz) is a commercial FM radio station licensed to Powell, Tennessee, and serving the Knoxville metropolitan area. WNFZ is owned by Midwest Communications. It airs an adult hits radio format, subscribing to the nationally syndicated ...

, also known as "94.3 the X", a modern rock radio station in Knoxville, Tennessee *

WQXA WQXA-FM (105.7 FM) is a commercial radio station licensed to serve York, Pennsylvania. Owned by Cumulus Media, it broadcasts an active rock format serving South Central Pennsylvania. Its studios are located at 2300 Vartan Way in Harrisburg, Pe ...

, also known as 105.7 "The 'X'", a modern rock radio station in Harrisburg, Pennsylvania *

WXDX-FM WXDX-FM (105.9 MHz) is a commercial radio station in Pittsburgh, Pennsylvania known as 105.9 The X. It airs an alternative rock radio format and is owned by iHeartMedia. The studios and offices are in Foster Plaza on Holiday Drive in Green Tree, ...

, also known as "The 'X' at 105.9", a modern rock radio station in Pittsburgh, Pennsylvania * WXLV (FM), former call sign brandeds as "90.3 "The X"", a college radio station in Allentown, Pennsylvania *

WXNY-FM WXNY-FM (96.3 FM ''La X 96.3'') is a commercial radio station that broadcasts an Hispanic rhythmic format. It is licensed to New York City, and serves the New York metropolitan area. WXNY is owned by Uforia Audio Network and its transmitter is ...

, known as "La X 96.3", a Spanish radio station in New York City *

WZDA WZDA (103.9 FM broadcasting, FM) is a commercial Radio broadcasting, radio station licensed to Beavercreek, Ohio, serving the Dayton metro area, owned by iHeartMedia, Inc. As of December 27, 2021, it broadcasts country music on its standard anal ...

, formerly known as "103.9 The 'X'", a modern rock radio station in Dayton, Ohio

Roller coasters

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, formerly known as X * X (roller coaster), in Thorpe Park, England

Businesses and organizations

Companies

X Development X Development LLC (formerly Google X) is an American semi-secret research and development facility and organization founded by Google in January 2010, which now operates as a subsidiary of Alphabet Inc. X has its headquarters about a mile and a ...

, previously "Google X" and "X" * X, the stock symbol for

United States Steel Corporation United States Steel Corporation, more commonly known as U.S. Steel, is an American integrated steel producer headquartered in Pittsburgh, Pennsylvania, with production operations primarily in the United States of America and in several countries ...

X.com X.com was an online bank co-founded by Elon Musk, Harris Fricker, Christopher Payne, and Ed Ho in 1999 in Palo Alto, California. In 2000, X.com merged with competitor Confinity, Confinity Inc., a software company also based in Palo Alto. Musk wa ...

, the original name of PayPal

Schools

St. Francis Xavier University St. Francis Xavier University is a public undergraduate liberal arts university located in Antigonish, Nova Scotia, Canada. It is a member of the Maple League, a group of primarily undergraduate universities in Eastern Canada. History St. Franc ...

, in Antigonish, Nova Scotia * The X, nickname for

École Polytechnique École may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoi ...

, a French engineering school

Other organizations

* X (demo party), a Dutch demoscene party which started in 1995 *

Organization X The Organization ''X'' ( el, Οργάνωσις Χ; commonly referred to simply as ''X'' ("Chi" in Greek), and members as Chites (Χίτες)) was a paramilitary right-wing anti-communist royalist organization set up in 1941 during the Axis occup ...

, a pro-royalist and anti-communist guerrilla group, active during the Axis occupation of Greece and the Greek Civil War

Language

* x, a symbol in the International Phonetic Alphabet for the

voiceless velar fricative The voiceless velar fricative is a type of consonantal sound used in some spoken languages. It was part of the consonant inventory of Old English and can still be found in some dialects of English, most notably in Scottish English, e.g. in ''loc ...

* , a symbol in the International Phonetic Alphabet for the

voiceless uvular fricative The voiceless uvular fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , the Greek chi. The sound is represented by (ex with underdot) in Ame ...

People

In arts and entertainment

Director X Julien Christian Lutz (born October 31, 1975), known professionally as Director X, is a Canadian filmmaker, commercial director, music video director, and television director. Having directed more than 100 music videos, he is widely known as a pr ...

(born 1975), Canadian music video director also known as X and Little X * Princess X (musician), former stage name of musician Liza Fox *

XXXTentacion Jahseh Dwayne Ricardo Onfroy (January 23, 1998 – June 18, 2018), known professionally as XXXTentacion, was an American rapper and singer-songwriter. Though a controversial figure due to his widely publicized legal troubles, XXXTentacion ga ...

(1998–2018), American rapper commonly referred to as "X" *

DMX (rapper) Earl Simmons (December 18, 1970 – April 9, 2021), known professionally as DMX, was an American rapper and actor. He began rapping in the early 1990s and released his debut album ''It's Dark and Hell Is Hot'' in 1998, to both critical acclaim ...

(1970–2021), American rapper commonly referred to as "X" *

Shaun Ryder Shaun William George Ryder (born 23 August 1962) is an English singer/songwriter and poet. As lead singer of Happy Mondays, he was a leading figure in the Madchester cultural scene during the late 1980s and early 1990s. In 1993, he formed Bla ...

(born 1962), English musician and singer–songwriter who sometimes uses the pseudonym X *

Terminator X Norman Rogers (born August 25, 1966), known professionally as Terminator X, is an American DJ best known for his work with hip hop group Public Enemy, which he left in 1998. He also produced two solo albums, '' Terminator X & The Valley of th ...

(born 1966), stage name for American DJ Norman Roberts, who worked with Public Enemy * X, ring name of wrestler

Carl Ouellet Carl Joseph Yvon Ouellet (born December 30, 1967) is a Canadian professional wrestler, better known by his ring name, PCO (originally a contraction of his long-term former ring name Pierre Carl Ouellet, but now standing for Perfect Creation One) ...

(born 1967)

Other people

* Clyde X (1931–2009), Nation of Islam official *

Khoisan X Khoisan X (4 March 1955 – 13 October 2010), formerly Benny Alexander, was a South African political activist born in Kimberley, Northern Cape, Kimberley, South Africa. Early life Bennett Alexander was the third child of Estelle and Johann Alexan ...

(1955–2010), political activist *

Laura X Laura X (born Laura Rand Orthwein, Jr.; in St. Louis, Missouri, in 1940) is a women's rights advocate. Laura X changed her name in 1962 to Laura Shaw Murra, which remains her legal name. She took the name Laura X on September 17, 1969, to symboli ...

(born 1940), feminist historian *

Malcolm X Malcolm X (born Malcolm Little, later Malik el-Shabazz; May 19, 1925 – February 21, 1965) was an American Muslim minister and human rights activist who was a prominent figure during the civil rights movement. A spokesman for the Nation of Is ...

(1925–1965), civil rights activist *

Michael X Michael X (17 August 1933 – 16 May 1975), born Michael de Freitas, was a Trinidad and Tobago-born self-styled black revolutionary and civil rights activist in 1960s London. He was also known as Michael Abdul Malik and Abdul Malik. Convicted ...

(1933–1975), activist and criminal *

Xiuhtezcatl Martinez Xiuhtezcatl Roske-Martinez ( ; born May 9, 2000), also known by the initial X, is an American environmental activist and hip hop artist. Martinez was formerly the Youth Director of Earth Guardians until 2019. Martinez has spoken about the effe ...

(born 2000), climate activist, often known as "X" * X, the girl in the

X Case ''Attorney General v X'', 992IESC 1; 9921 IR 1, (more commonly known as the "X Case") was a landmark Irish Supreme Court case which established the right of Irish women to an abortion if a pregnant woman's life was at risk because of pregnanc ...

, a landmark court case about abortion in Ireland * X, the pseudonym under which the "

X Article The "X Article" is an article, formally titled "The Sources of Soviet Conduct", written by George F. Kennan and published under the pseudonym "X" in the July 1947 issue of ''Foreign Affairs'' magazine. The article widely introduced the term " ...

", formally titled "The Sources of Soviet Conduct", was published in ''

Foreign Affairs ''Foreign Affairs'' is an American magazine of international relations and U.S. foreign policy published by the Council on Foreign Relations, a nonprofit, nonpartisan, membership organization and think tank specializing in U.S. foreign policy and ...

'' magazine * X, surname often assumed by members of the

Nation of Islam The Nation of Islam (NOI) is a religious and political organization founded in the United States by Wallace Fard Muhammad in 1930. A black nationalist organization, the NOI focuses its attention on the African diaspora, especially on African ...

Science, technology, and mathematics

Astronomy

* X, signifying a comet of unknown orbit *

Galaxy X (galaxy) Galaxy X is a postulated dark satellite dwarf galaxy of the Milky Way Galaxy. If it exists, it would be composed mostly of dark matter and interstellar gas with few stars. Its proposed location is some from the Sun, behind the disk of the Milky ...

, a postulated dark galaxy *

Planet X Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and continued at the start of the 20th with Percival Lowell's ...

, a hypothesised planet in the outer solar system

Biology

* × (or x), in binomial nomenclature as part of a

hybrid name In botanical nomenclature, a hybrid may be given a hybrid name, which is a special kind of botanical name, but there is no requirement that a hybrid name should be created for plants that are believed to be of hybrid origin. The '' International C ...

in botany *

X chromosome The X chromosome is one of the two sex-determining chromosomes (allosomes) in many organisms, including mammals (the other is the Y chromosome), and is found in both males and females. It is a part of the XY sex-determination system and XO sex-d ...

, one of the two sex-determining chromosomes in many animal species, including mammals

Chemistry

* X, the pseudoelement symbol for a halogen or halide in organic chemistry; see

Skeletal formula The skeletal formula, or line-angle formula or shorthand formula, of an organic compound is a type of molecular structural formula that serves as a shorthand representation of a molecule's bonding and some details of its molecular geometry. A ...

Computing

* X (writing speed), the speed at which data is written to an optical disc *

OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...

(pronounced 'OS ten'), the former name of the macOS operating system for Apple computers *

X Window System The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wit ...

, a client-server display protocol often used in UNIX environments * X file format, used by

DirectX Microsoft DirectX is a collection of application programming interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms. Originally, the names of these APIs all began with "Direct", ...

Mathematics

10 (number) 10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, by far the most common system of denoting numbers in both spoken and written language. It is the first double-digit number. The re ...

(Roman numeral: X) *

Cross product In mathematics, the cross product or vector product (occasionally directed area product, to emphasize its geometric significance) is a binary operation on two vectors in a three-dimensional oriented Euclidean vector space (named here E), and is ...

or vector product (×) *

Multiplication sign The multiplication sign, also known as the times sign or the dimension sign, is the symbol , used in mathematics to denote the multiplication operation and its resulting product. While similar to a lowercase X (), the form is properly a four- ...

(× or ✕) * x, an axis in the

Cartesian coordinate system A Cartesian coordinate system (, ) in a plane is a coordinate system that specifies each point uniquely by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular oriented lines, measured in t ...

* ''x'', a common

variable Variable may refer to: * Variable (computer science), a symbolic name associated with a value and whose associated value may be changed * Variable (mathematics), a symbol that represents a quantity in a mathematical expression, as used in many ...

for unknown or changing concepts in mathematics

Physics

X (charge) In particle physics, the X charge (or simply ''X'') is a conserved quantum number associated with the SO(10) grand unification theory. It is thought to be conserved in strong, weak, electromagnetic, gravitational, and Higgs interactions. B ...

, a conserved quantum number in particle physics *

X band The X band is the designation for a band of frequencies in the microwave radio region of the electromagnetic spectrum. In some cases, such as in communication engineering, the frequency range of the X band is rather indefinitely set at approxim ...

, part of the microwave band of the electromagnetic spectrum *

X unit : ''For the software testing tools, see xUnit.'' The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays. Originally defined by the Swedish ph ...

(X), in physics

Other uses

Generation X Generation X (or Gen X for short) is the Western world, Western demographic Cohort (statistics), cohort following the baby boomers and preceding the millennials. Researchers and popular media use the mid-to-late 1960s as starting birth years a ...

, the Western sociological generation born after Boomers or Jonesers and before Millennials *

iPhone X The iPhone X (Roman numeral "X" pronounced "ten", also known as iPhone 10) is a smartphone designed, developed and marketed by Apple Inc. It is part of the 11th generation of the iPhone. Available for pre-order from October 27, 2017, it was re ...

, a smartphone by Apple Inc *

HiPhi X The HiPhi X is a 6-seater all-electric battery-powered full-size luxury CUV from the Chinese new energy vehicle brand HiPhi. Overview HiPhi 1 Concept The HiPhi 1 pre-production Concept was publicly unveiled on 31 July 2019 as the production- ...

, an electric crossover produced from 2020 *

Tesla Model X The Tesla Model X is a Battery electric vehicle, battery electric Mid-size crossover SUV#Luxury, mid-size luxury crossover SUV produced by Tesla, Inc. since 2015. Developed from the full-size car, full-sized sedan platform of the Tesla Model S, ...

, an electric crossover by Tesla * X (automobile), a French car produced in 1908 and 1909 * X (gender identity), used on passports and identification documents to denote intersex or indeterminate gender *

X mark An X mark (also known as an ex mark or a cross mark or simply an X or ex or a cross) is used to indicate the concept of negation (for example "no, this has not been verified", "no, that is not the correct answer" or "no, I do not agree") as well ...

, a common written symbol of negation or affirmation * X, the symbol for a

strike Strike may refer to: People *Strike (surname) Physical confrontation or removal *Strike (attack), attack with an inanimate object or a part of the human body intended to cause harm *Airstrike, military strike by air forces on either a suspected ...

in bowling * X, a handwritten symbol for a

kiss A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...

* X, a street name for the drug

MDMA 3,4-Methylenedioxymethamphetamine (MDMA), commonly seen in Tablet (pharmacy), tablet form (ecstasy) and crystal form (molly or mandy), is a potent empathogen–entactogen with stimulant properties primarily used for Recreational dru ...

* X, often used by

straight edge Straight edge (sometimes abbreviated sXe or signified by XXX or X) is a subculture of hardcore punk whose adherents refrain from using alcohol, tobacco, and other recreational drugs, in reaction to the excesses of punk subculture. For some, thi ...

rs to show their commitment to their lifestyle * ╳, a box-drawing character * Ⓧ, a

typographical symbol Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with L ...

in Japanese resale price maintenance * X, sometimes used in acronyms and other abbreviations to represent the word "

cross A cross is a geometrical figure consisting of two intersecting lines or bars, usually perpendicular to each other. The lines usually run vertically and horizontally. A cross of oblique lines, in the shape of the Latin letter X, is termed a sa ...

" * X, the legal

signature A signature (; from la, signare, "to sign") is a handwritten (and often stylized) depiction of someone's name, nickname, or even a simple "X" or other mark that a person writes on documents as a proof of identity and intent. The writer of a ...

of an illiterate person * X (fragrance), a fragrance set by Irish pop vocal band Westlife * ''The X'', the

Xcel Energy Center Xcel Energy Center (also known as "The X") is a multipurpose arena in Saint Paul, Minnesota, United States. Completed in 2000, it is named for its locally based corporate sponsor Xcel Energy. With an official capacity of 17,954, the arena has four ...

, an arena in Saint Paul, Minnesota *

Nilgiri Mountain Railway X class The X class is a metre gauge 0-8-2RT rack and pinion compound locomotive used by the Nilgiri Mountain Railway in the Nilgiri Hills of southern India. They are used on the section between Coonoor and Mettupalayam, where the steepest gradient is ...

* a stand-in for the Greek letter

Chi Chi or CHI may refer to: Greek *Chi (letter), the Greek letter (uppercase Χ, lowercase χ); Chinese *Chi (length), ''Chi'' (length) (尺), a traditional unit of length, about ⅓ meter *Chi (mythology) (螭), a dragon *Chi (surname) (池, pin ...