- ten: being one more than nine
- ten: the cardinal number that is the sum of nine and one; the base of the decimal system
- the 24th letter of the Roman alphabet
- Adam: street names for methylenedioxymethamphetamine
- AmiExpress - also known as /X - by Synthetic Technologies was a popular BBS software application for the Commodore Amiga line of computers. AmiExpress was extremely popular among the warez scene for trading (exchanging) software.
- Arithmetic or arithmetics (from the Greek word ἀριθμός = number) is the oldest and most elementary branch of mathematics, used by almost everyone, for tasks ranging from simple day-to-day counting to advanced science and business calculations. ...
- In mathematics, the factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,
- Microsoft Dynamics AX is one of Microsoft’s enterprise resource planning software products. It is part of the Microsoft Dynamics family.
- X (also known as X: The Man with the X-Ray Eyes) is a 1963 science fiction/horror motion picture.
- X is an American punk rock band, formed in Los Angeles, California 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 DJ Bonebrake. ...
- X is the name of a Greek album by singer Anna Vissi released 2002 in Greece and Cyprus. The album reached Platinum in Greece and in Cyprus, it was also officially released in Turkey by Sony Music.
- X is an Australian punk rock band, formed in Sydney in 1977 and led by the late Ian Rilen. The band has split and reformed several times.
- 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.
- In particle physics, the X-charge (or simply X) is a conserved quantum number associated with the SO(10) grand unification theory.
- 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 eighth studio album by British rock band Def Leppard, released in 2002. Much like 1996's Slang, it featured another departure from their signature sound by moving into the pop genre. The album charted at #11 on The Billboard 200 and #14 on the UK Albums Chart . ...
- 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 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. ...
- X is Australian rock band INXS's seventh studio album, released in 1990. 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 voiceless velar fricative is a type of consonantal sound used in some spoken languages. The sound was part of the consonant inventory of Old English and can still be found in some dialects of English, most notably in Scottish English.
- is a Japanese heavy metal band founded in 1982 by Toshimitsu "Toshi" Deyama and Yoshiki Hayashi.
- X: Writings ’79–’82 is a book by American avant-garde composer John Cage (1912–1992), first published in 1983. 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. ...
- X is the third studio album by the brothers, K-Ci & JoJo. It was entitled X to mark their tenth anniversary. The album was released on December 5, 2000. The song "Crazy" was the album's lead single.
- voiceless velar fricative; An unknown variable; The first coordinate in Cartesian coordinates, representing horizontal position; A kiss at the end of a letter, or similar missive
- A symbol of the IPA, representing a voiceless uvular fricative