What is "x"

X \X\ ([e^]ks). X, the twenty-fourth letter of the English alphabet, has three sounds; a compound nonvocal sound (that of ks), as in wax; a compound vocal sound (that of gz), as in example; and, at the beginning of a word, a simple vocal sound (that of z), as in xanthic. See Guide to Pronunciation, [sect][sect] 217, 270, 271.

Note: The form and value of X are from the Latin X, which is from the Greek [Chi], which in some Greek alphabets had the value of ks, though in the one now in common use it represents an aspirated sound of k.

The entire entry for X in Johnson's dictionary (1756) is: "X is a letter, which, though found in Saxon words, begins no word in the English language." Most English words beginning in -x- are of Greek origin or modern commercial coinages. East Anglian in 14c. showed a tendency to use -x- for initial sh-, sch- (such as xal for shall), which didn't catch on but seems an improvement over the current system. As a symbol of a kiss on a letter, etc., it is recorded from 1765. In malt liquor, XX denoted "double quality" and XXX "strongest quality" (1827).\n

\nAlgebraic meaning "unknown quantity" (1660 in English, from French), sometimes is said to be from medieval use, originally a crossed -r-, in that case probably from Latin radix (see root (n.)). Other theories trace it to Arabic (Klein), but a more prosaic explanation says Descartes (1637) took x, y, z, the last three letters of the alphabet, for unknowns to correspond to a, b, c, used for known quantities.\n

\nUsed allusively for "unknown person" from 1797, "something unknown" since 1859. As a type of chromosome, attested from 1902 (first so called in German; Henking, 1891). To designate "films deemed suitable for adults only," first used 1950 in Britain; adopted in U.S. Nov. 1, 1968. The XYZ Affair in American history (1797) involved French agents designated by those letters.

"cross out with an 'X'," 1942, from X.

abbr. intersex or transgender (qualifier: passports and identification documents) conj. (context fandom English) (non-gloss definition: Used between the names of two characters to denote a ship, particularly in anime, manga, and video games.) letter (Latn-def en letter 24 ex)

adj. being one more than nine [syn: ten, 10]

X̂ is the Latin letter X with a circumflex. The letter is used in the Haida language and Aleut languages of Alaska.

Category:Eskimo–Aleut languages

X is an American punk rock band, formed in Los Angeles in 1977. Established among the first wave of American punk, 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. After a period of inactivity during the mid to late 1990s, X reunited in the early 2000s, and currently tours.

X achieved limited mainstream success but influenced various genres of music, including punk rock and folk rock. In 2003, X's first two studio albums, Los Angeles and Wild Gift, were ranked by Rolling Stone as being among the 500 greatest albums of all time. Los Angeles was ranked 91st on Pitchfork's Top 100 Albums of the 1980s. The band received an Official Certificate of Recognition from the City of Los Angeles in acknowledgment of its contribution to Los Angeles music and culture.

, also known as X/1999, is a Japanese shōjo manga series created by Clamp, a creative team made up by Satsuki Igarashi, Nanase Ohkawa, Tsubaki Nekoi, and Mokona. It premiered in Monthly Asuka's May 1992 issue and ran there until the magazine's editors showed concern in the increasingly violent stories. The series went on long-term hiatus in March 2003 and has yet to be concluded. The story takes place at the end of days, in the year 1999. The series follows Kamui Shirō, a young esper who returns home to Tokyo after a 6-year absence to face his destiny as the one who will determine humanity's fate.

Kadokawa Shoten collected and published the individual chapters in 18 tankōbon volumes, with five chapters published in the book "All about Clamp". All but several final chapters have been published. It has been adapted into a series of audio dramas, a 1996 animated feature film and a television series in 2001 with the two latter produced by Madhouse. Viz Media published all 18 volumes in North America, while the film and the TV series have released in DVDs by Manga Entertainment and Geneon, respectively.

The series is a foray into apocalyptic fiction; it combines elements from various end of the world scenarios, both secular and religious, with its own mythos. Its many themes include exploring the personality of mankind and their relationship with others and external conflicts, such as impending armageddon. It has also garnered mostly positive reviews, despite its lack of an ending.

X is an Australian punk rock band, formed in Sydney in 1977 founded by the late Ian Rilen Steve Lucas, Ian Krahe and Steve Cafiero.

X is the 24th letter of the Latin alphabet.

X may also refer to:

1. redirect 10 (number)

X is the third and final studio album to be released by British pop group Liberty X, released on 10 October 2005. The album was the band's first release on the Virgin Records label, after being dropped from V2 Records in 2004. The album was released two years after their previous album, Being Somebody. The album was the least successful of their three studio albums, only peaking at #27 on the UK Albums Chart and selling less than 50,000 copies.

X (pronounced ten) is the eighth studio album by English rock band Def Leppard, released in 2002 by Island Records in the US and sister label Mercury worldwide. Much like 1996's Slang, it featured another departure from their signature sound by moving into the pop genre. The album charted at No. 11 on The Billboard 200 and No. 14 on the UK Albums Chart. Most of the album was produced by Pete Woodroffe and the band, with remaining tracks produced by either Marti Frederiksen or Per Aldeheim and Andreas Carlsson. This is the first Def Leppard album in which drummer Rick Allen actively took part in song-writing. On all of the band's prior albums, he is only credited with helping co-write 3 tracks. On this album alone, he co-wrote 11.

The album features the Roman numeral 'X', recognising it as their tenth album release, although the album is in fact only their eighth collection of all-new studio material. The other two albums released by the band prior to the release of X, Retro Active and Vault, were a rerecording of B-sides and rarities and a greatest hits set respectively.

The album peaked at number 11 on the Billboard 200, but did not sell to the standards of their previous releases and failed to earn any RIAA certifications. Nothing from this album had been performed live by the band since the conclusion of its supporting tour until the 'Rock of Ages' tour of 2012 during which the opening track " Now" was performed acoustically.

For a short time after the album was released, Def Leppard's website Defleppard.com featured a free mp3 download of "Perfect Girl," a bonus track and early version of the track "Gravity".

X is Australian rock band INXS's seventh studio album, released in 1990. The follow-up to the massive seller Kick, it peaked at No. 1 in Australia, No. 5 in the United States, No. 2 in the United Kingdom, No. 5 in Switzerland and No. 10 in Sweden. The album contains four hit singles, "Suicide Blonde", "Disappear", "By My Side" and "Bitter Tears". It was the third consecutive INXS album produced by Chris Thomas.

The title, the Roman numeral for "10", represents the band's tenth year since their debut album was released in 1980. X features a sample of blues-harp player Charlie Musselwhite on "Suicide Blonde", and Musselwhite himself playing on "Who Pays the Price" and "On My Way". In 2002, a remastered version of the album was released which included five previously unreleased tracks.

The singles " Suicide Blonde" and " Disappear" were used in the 1991 teen movie Mystery Date.

X is the tenth album by Klaus Schulze. It was originally released in 1978, and in 2005 was the fifth Schulze album reissued by Revisited Records.

On X Schulze attempted to execute a concept album of six "musical biographies" evoking contemporary or historical intellectuals with an influence on Schulze: Friedrich Nietzsche, Georg Trakl, Frank Herbert, Friedemann Bach, Ludwig II. von Bayern, and Heinrich von Kleist. (In Ludwig II. von Bayern Schulze uses a theme borrowed from the third movement of Vivaldi's Concerto No. 11 in D minor (RV565) for 2 violins, cello and strings.) The work is from the classic era of Berlin School.

For two of the tracks, "Friedemann Bach" and "Ludwig II. von Bayern" (as well as the first few minutes of "Heinrich von Kleist") Schulze recorded a modest string orchestra and looped them on tape. He had done this in 1972 on his first solo album, Irrlicht, but this time he did not filter the orchestra beyond recognition. The mixture of classical music and unearthly electronic sounds gives X a much more organic sound than anything Schulze's contemporaries were doing at the time, such as Jean Michel Jarre's Equinoxe. On following releases Schulze employed a cello, particularly on Dune.

"Objet d'Louis", the bonus track on the 2005 reissue, is a 1978 live version of "Ludwig II. von Bayern" with a complete orchestra, recorded while Schulze was on a tour in Belgium.

X (formerly known as X:\ No Way Out) is an indoor roller coaster located at Thorpe Park, England. It was the park's first non-powered roller-coaster. It is themed around a rave and has the strapline "Ride on a wave of light and sound".

The roller coaster combines a variety of lights, lasers and music with a completely indoor ride circuit, featured inside a large blue and terracotta pyramid structure.

is a three-dimensional first-person shooter video game released for the Game Boy only in Japan on May 29, 1992. The game was developed and published by Nintendo, with assistance from Argonaut Software. X was followed by an internationally released DSiWare exclusive sequel, X-Scape, in 2010.

The X was a French automobile produced between 1908 and 1909. Little is known about the marque, other than the fact that "an unknown quantity" was manufactured at Kremlin-Bicêtre, and that one model was shown at the 1908 Paris Salon.

Category:Defunct motor vehicle manufacturers of France

1. Redirect List of Marvel Comics characters: X#X

X (sometimes called the "X0 events") is an annually held trade show hosted by Microsoft, showcasing its Xbox - and more recently, Games for Windows - portfolio of hardware, software, and services. The X show has been held every year since 2001 (with the exception of 2004) in diverse European cities. Microsoft Canada also organises an X Show every year to presents its games to the Canadian press. This show first started in 2002 and was open to the public in 2006.1.

X, sometimes referred to as Mr. X, is a fictional character on the American science fiction television series The X-Files. He serves as an informant, leaking information to FBI Special Agents Fox Mulder and Dana Scully to aid their investigation of paranormal cases, dubbed X-Files. The character serves as a replacement for Deep Throat, who had been killed off in the first season finale, " The Erlenmeyer Flask". X himself would be killed off after appearing in several seasons, eventually being replaced by Marita Covarrubias.

X is portrayed in the series by Steven Williams, and made his début in the second season episode " The Host", although the character would not appear on-screen until " Sleepless", two episodes later. The role had originally been conceived as female, with Natalija Nogulich cast in the role; however, her initial scenes were deemed unsatisfactory by the producers, leading to her replacement. Williams' portrayal of X was intended to introduce a personality completely different to the character's predecessor, Deep Throat, and has been positively received by critics and fans.

"X" is a single by English-Irish pop group Liberty X. It was released on 19 June 2006 as the third and final single from their third studio album X (2005). It was the written by band members Tony Lundon, Kelli Young, Jessica Taylor and Kevin Simm, alongside Johnny Douglas, and was the band's last single before the announcement of their split. and became their lowest charting single of their career, only peaking at number 47 on the UK Singles Chart. However, the song became a minor hit in South Africa, peaking at number 21 on the country's official airplay chart.

The X(3872) is an anomalous particle with a mass of 3871.68 MeV/c which does not fit into the quark model because of its quantum numbers. It was first discovered in 2003 by the Belle experiment in Japan and later confirmed by several other experimental collaborations. Several theories have been proposed for its nature, such as a mesonic molecule or a diquark-antidiquark pair ( tetraquark).

The quantum numbers of X(3872) have been determined by the LHCb Experiment at CERN in March 2013. The values for J is 1.

X is a comic book character who starred in his own self-titled series published by Dark Horse Comics for their Comics Greatest World imprint. He is a dark anti-hero vigilante with little true feeling and a strong tendency to kill.

After the character debuted in Dark Horse Comics #8, his own self-titled series began with a cover date of February, 1994, ending with issue #25 in April 1996.

Dark Horse re-launched the title with issue #0 in April 2013, and a new creative team of Duane Swierczynski and Eric Nguyen.

X, in comics, may refer to:

• X (Dark Horse Comics), a character and series by Dark Horse Comics
• X (manga), a Japanese manga, also known as X/1999
• X (Marvel Comics), a mutant character owned by Marvel Comics

X is the third studio album by American R&B duo and brothers K-Ci & JoJo, released December 5, 2000 on MCA. Recording sessions took place during 1999–2000. Production was handled by various producers, including Mike Smoov, Rory Bennett, and DeVante Swing. The album peaked at number twenty on the US Billboard 200. It achieved acceptable international charting and produced two singles that had minor success charting. The lead single " Crazy" would peak at number 11 on the US Billboard Hot 100. Upon its release, X received average reviews from music critics. The album has been certified platinum by the Recording Industry Association of America (RIAA), for shipments of 1,000,000 copies in the United States.

X is a science fiction space trading and combat simulator series created by German developer Egosoft. The series is set in the X-Universe where several races populate a number of worlds connected by jumpgates. The games feature free roaming gameplay with trading, combat, empire building, and missions; leading to the series' phrase: "Trade, Fight, Build, Think".

X, a reference to the letter Chi in the Greek alphabet, is the name of a Greek album by singer Anna Vissi released 2002 in Greece and Cyprus by Sony Music Greece. The album reached 2x platinum in Greece and 3x platinum in Cyprus. It was also released in Turkey by Sony Music Turkey.

"X" is the second single from Xzibit's third studio album, Restless. Fellow West Coast rapper Snoop Dogg can be heard talking in the outro. It was produced by Dr. Dre with co-production from Scott Storch and Mel-Man. Dr. Dre can also be heard saying "Not these niggas again." in a line.

Ẋ ( X with dot above) is a letter in the Latin orthography of the Chechen language used to represent the sound .

Category:Specific letter-diacritic combinations Category:Chechen language

X is the fourth studio album by Kristeen Young. It is themed around various reversals of, and thoughts on, the Ten Commandments.

The album was produced by Tony Visconti and engineered by Mario J. McNulty at Studio B, Looking Glass Studios. It features "Baby" Jeff White on drums, David Matos on guitar and a duet with Placebo's Brian Molko on No Other God.

X is the tenth studio album by Australian singer Kylie Minogue. It was released on 21 November 2007 by Parlophone. It is her first release since the greatest hits compilation Ultimate Kylie (2004), and her first studio album since Body Language (2003). Work on the album began following Minogue's gradual recovery from breast cancer and subsequent radiotherapy treatment. Her cancer, which was diagnosed in May 2005, resulted in the postponement of Showgirl: The Greatest Hits Tour midway through its run. Minogue resumed the tour in late 2006, in the midst of recording X, and was completed later in the following year. The album introduced new American and European producers including Bloodshy & Avant, Guy Chambers, Calvin Harris and Freemasons.

X has received positive reviews from music commentators. Many critics had commended the production, Minogue's innovative writing and many believed that it was a true welcome back to the pop scene. However, upon release, some critics were divided whether the album was a 'comeback' album and some noted the fillers and theme inconsistency. Commercially, X was a success. In Minogue's native Australia, the album debuted at number one on the Australian Albums Chart, becoming her first number-one album since Body Language (2003) and was certified platinum by the Australian Recording Industry Association (ARIA). In the United Kingdom, the album peaked at number four, being held off by artists Westlife, Shayne Ward (which was the highest debuting album that week) and Leona Lewis. It gained a higher position than her last record and was certified Platinum by the British Phonographic Industry. The album achieved strong charting internationally, peaking inside the top 20 in countries including Austria, Germany, Ireland, Taiwan and France.

" 2 Hearts" was released as the lead single from X. The song received mixed reviews, praising the lazy tone and production while criticizing the lack of commercial appeal and memorability. The song was a commercial success, peaking inside the top 10 in countries including Australia and Spain (peaking at number one in both territories), Italy, Ukraine, Sweden and the United Kingdom. Two singles were released on 16 and 17 February, respectively; " Wow" was released in Australia, Europe and the United States, while " In My Arms" was released in Europe. The first was positively received and achieved chart success, while the latter did not have the similar chart progression. " All I See" and " The One" were released as digital singles, the first to promote the album in the United States and the latter released in Europe.

X was promoted by the KylieX2008 where she traveled around Europe, Oceania, South America, Asia and South Africa. The tour received favorable reviews from critics and was a commercial success, making it Minogue's most expensive tour at the time. Due to Minogue's lack of success in North America, she traveled there in 2009 for her tour For You, for Me to promote the album. The album was nominated for a BRIT Award for International Album in 2008, as well as a Grammy Award for Best Electronic/Dance Album in 2009, Minogue's fifth Grammy Award nomination. According to The Times, the album had sold one million copies worldwide as of December 2008.

X: Writings ’79–’82 is a book by American avant-garde composer John Cage (1912–1992), first published in 1983. The book includes mesostics on the names of various people. In the forward to X, Cage writes that the volume's texts represent an attempt "to find a way of writing which comes from ideas, is not about them, but which produces them." The book contains the following works:

• "Foreword" (1983)
• "Writing for the Fourth Time through Finnegans Wake" (1983)
• "'There is not much difference between the two.' (Suzuki Daisetz)." (1979)
• "Toyama 1982" (1982)
• " James Joyce, Marcel Duchamp, Erik Satie: An Alphabet" (1981–83)
• "Another Song" (1981)
• "Writing through the Cantos" (1983)
• (untitled) (1979, also known as "Correction")
• "B.W. 1916–1979" (1979, also known as " Ben Weber, 1916–1979")
• "For her first exhibition with love" (1982)
• "Diary: How to Improve the World (You Will Only Make Matters Worse)" (continued 1973–82)
• "Wishful Thinking" (1983)
• "Muoyce (Writing for the Fifth Time through Finnegans Wake)" (1982, also published earlier as "Muoyce")

X is a Dutch demoscene party which started in 1995 in Utrecht, The Netherlands organized by Success & The Ruling Company, Xenon and Silicon Ltd.

X is the successor of the Silicon Ltd. Winter and Summer parties which were held between 1990 and 1992. With about 250 visitors, it is the world's biggest Commodore 64 demoscene-party, attracting demosceners from not only The Netherlands, but also from other European countries (e.g. Sweden, Finland, Poland, Germany), or even from overseas (for example Australia, United States).

X is the tenth studio album by American country music artist Trace Adkins. The album's name is the Roman numeral for ten, as counting his two Greatest Hits packages it is his tenth album overall. X was released November 25, 2008 on Capitol Records Nashville. The album includes the singles " Muddy Water", " Marry for Money", and " All I Ask For Anymore", all of which have charted in the Top 40 on Hot Country Songs, with the latter two becoming Top 20 hits.

X is the tenth LP album released 1983 by the Danish rock band Gnags. The album was released digitally remastered in 1995 on CD.

In particle physics, the X-charge (or simply X) is a conserved quantum number associated with the SO(10) grand unification theory.

X is related to the difference between the baryon number B and the lepton number L (that is B − L), and the weak hypercharge Y via the relation:

X = 5(B − L) − 2Y. 

X, A Quarterly Review, often referred to as X magazine, was a British review of literature and the arts published in London which ran for seven issues between 1959 and 1962. It was co-founded and co-edited by Patrick Swift and David Wright.

X is the tenth studio album released by the band Royal Hunt on January 20, 2010, on Scarlet Records in Europe and on Marquee/ Avalon Records in Japan.

X is the tenth studio album by American progressive rock band Spock's Beard. Similar to what Marillion did for Anoraknophobia, the album was funded by pre-orders of a limited edition of the album before the album was recorded. Those who ordered the album's "Ultra Package" had their names listed in the CD booklet and included as part of the track "Their Names Escape Me", which is exclusive to the limited edition. The album was released independently in May 2010. A retail and digital release with Mascot Records was released in August 2010. This album is the last studio album recorded with former drummer and vocalist Nick D'Virgilio, who left the band on November 18, 2011 to focus on other commitments.

X is an American semi-secret research and development facility founded by Google in January 2010 as Google and is an operatable subsidiary of Alphabet Inc. X is located about a half mile from Google's corporate headquarters, the Googleplex, in Mountain View, California.

Work at X is overseen by entrepreneur scientist Astro Teller, as CEO and "Captain of Moonshots". The lab started with the development of Google's self-driving car.

Logo

On 2 October 2015, after the complete restructuring of Google into Alphabet, the company was renamed to X.

X is the ninth studio album by Fourplay, released in 2006.

X (as in the Roman numeral for 10) is the name of the tenth studio album by gothic rock band The 69 Eyes. The band chose "Red" as their first single. Days before the release of X, they released "Borderline" as their second single.

"Rosary Blue", a bonus track, features vocals by American tattoo artist Kat Von D.

X is the fifth studio album by London-based grime music collective Roll Deep, it was released on 30 September 2012. The Album was named X because it is to represent tens years within the music industry. Two singles have been released from the album, " Picture Perfect" and "Can't Wait for the Weekend".

X is the sixth studio album by American recording artist Chris Brown; it was released on September 16, 2014, by RCA Records. The album serves as the follow-up to his fifth album Fortune (2012).

Commercially, the album debuted at number 2 on the US Billboard 200 selling 146,000 copies in its first week, becoming his first album to miss the summit of the chart since Graffiti (2009) and his third album to go to number 2 on the chart overall following Exclusive (2007). It also became his sixth consecutive top ten debut in the United States. By the end of 2015, the album had sold 404,000 copies in the United States. It has been certified platinum by the Recording Industry Association of America (RIAA) in March 2016, making this Brown's second platinum-selling album following Fortune at the same time.

X received generally positive reviews from critics, who celebrated the record's diverse sound, but were ambivalent towards its lyrical content. The album was considered a big improvement compared to its critically panned predecessor Fortune.

Preceding the album's release by five singles: " Fine China", " Don't Think They Know", " Love More", " Loyal" and " New Flame". The album's fourth single "Loyal" became its most successful, by peaking at number 9 on the US Billboard Hot 100 and at number 10 in the United Kingdom. Pushing the promotion for the album further, Brown performed and appeared at several televised music events and music festivals across the United States.

X is a Norwegian film from 1986. The play was directed by Oddvar Einarson, and starred Bettina Banoun and Jørn Christensen. The film started through the collective Film Group 84, and was completed by Einarson own production company.

X was released on DVD in 2010, with a lengthy interview with the director as extras.

X is an album by the fusion jazz band Tribal Tech released 26 March 2012.

"X" is the twenty-fourth novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone, a private eye based in Santa Teresa, California, a fictional version of Santa Barbara, California. The novel, set in the late 1980s, finds Kinsey pursuing a sociopathic serial killer. The novel, was published by G.P. Putnam's Sons, was released in the United States on August 25, 2015.

x (pronounced "multiply") is the second studio album by English singer-songwriter, Ed Sheeran. It was released on 20 June 2014 in Australia and New Zealand, and worldwide on 23 June through Asylum Records and Atlantic Records. The album received positive reviews from music critics. It has become an international success, peaking at No. 1 in fifteen countries, while topping both the UK Albums Chart and the US Billboard 200. x also reached the top 5 in seven other countries and was the best selling album of 2014 in Australia, New Zealand, Ireland, and the United Kingdom. Five singles were released from the album: " Sing", " Don't", " Thinking Out Loud", " Bloodstream" (a collaboration with Rudimental), and " Photograph".

The lead single, "Sing", was a major international success. It became Sheeran's first UK number-one single and peaked inside the Top 10 in several other countries. The second single, "Don't", was also a worldwide success. It peaked at No. 8 in the UK and became Sheeran's first ever Hot 100 top 10 hit. The album's third single, "Thinking Out Loud", was a massive international success, peaking at No. 1 in 12 countries, and the top five in 12 more. It became Sheeran's second UK number-one single and has been certified 3× Platinum, with sales of over 1 million copies in the UK. "Thinking Out Loud" also became Sheeran's biggest hit in the US to date, peaking at No. 2 on the Billboard Hot 100. It has been certified 4× Platinum, with sales of over 4 million copies in the US alone. The albums fourth single, a remix to "Bloodstream", peaked at No. 2 on the UK Singles Chart, becoming the fourth-consecutive single from x to hit the top 10 in Sheeran's native country. "Photograph" was released as the album's fifth and final single. It gave Sheeran his fifth consecutive top ten single from the album in Australia and New Zealand, peaking at numbers 9 and 8, respectively. "Photograph" also met international chart success, peaking inside the top 10 in ten countries.

In December 2014, Spotify named x the most-streamed album in the world for 2014, racking up more than 430 million streams for the year. x has been certified 8× Platinum in the UK with sales of over 2.5 million copies, making it one of the best selling albums in the history of the UK, and the sixth best-selling album of the decade in the UK. The album has been certified 3× Platinum in Canada, 6× Platinum in New Zealand, and double platinum in the US, with sales of nearly 2 million copies in the US. It also became the first album ever to be certified Diamond in Australia. Also, x broke Adele's record for the longest charting Top 10 album in the history of the United Kingdom. In 2015, x won the Brit Award for British Album of the Year, and at the 57th Grammy Awards it was nominated for Best Pop Vocal Album and Album of the Year.

"X" is a song by American recording artist Chris Brown, taken from his sixth homonym studio album X (2014), and was released as an instant-gratification track alongside the album pre-order on iTunes on August 25, 2014. It was written by Brown, Diplo, Djemba Djemba, RoccStar, Dewain Whitmore, Jr. and Sevyn Streeter. The song was produced by Pop Wansel and Dayvi Jae. Musically, "X" is a song that unites R&B and soul vocals with a dance beat. The song contains lyrics about Brown forgetting a failed relationship with a woman. "X" received critical praise from music critics, which praised the maturity of the lyrics and his production. Following the release of X, as a result of the strong digital downloads, the song charted on multiple charts worldwide; it peaked at number 98 on the US Billboard Hot 100, number 26 on the US Hot R&B/Hip-Hop Songs chart, number 63 on the French Singles Chart, number 12 on the UK Singles R&B Chart, number 81 on the UK Singles Chart and number 75 on the Australian Singles Chart.

X is the third mixtape by American hip hop recording artist Lucki, released on May 30, 2015 on his 19th birthday.

"X" (formally "X Bitch") is a single by American rapper 21 Savage and American record producer Metro Boomin. It is the first single from their collaborative extended play Savage Mode. It features guest vocals from Future. It was released July 14, 2016.