J (disambiguation)

J is the tenth letter of the Latin alphabet.

J may also refer to:
* Palatal approximant in the International Phonetic Alphabet

Astronomy

* Jupiter
* J, a provisional designation prefix for some objects discovered between May 1 and 15 of a year

Computing

* J (programming language), successor to APL
* J# programming language for the Microsoft .NET Framework
* J (text editor), written in Java

Genetics

* Haplogroup J (mtDNA)
* Haplogroup J (Y-DNA)

Mathematics

* Bessel function
* "j", the second imaginary unit of a quaternion

Physics

* Joule, the SI unit of energy
* Current density
* Polar moment of inertia
* "j", the imaginary unit ($sqrt\{-1\}$) in fields where "i" is traditionally used for another value
* J, one name (by Samuel C. C. Ting) for the J/ψ particle

Music

* J (singer), a K-pop singer
* J (musician), a Japanese musician
* J Records, a record label
* J, the first single off of Reggie and the Full Effect's album .

Film and television

* Agent J, a character in the "Men in Black" films portrayed by Will Smith
* J, an antagonist in "Bobobo"
* Kamen Rider J, a Japanese movie.

Miscellanea

* J, slang for Joint (cannabis)
* J band, radio frequencies ranges from 10 to 20 GHz
* J (psychedelic)
* J (New York City Subway service)
* J, the international license plate code for Japan
* J, the postal code for the western and northern regions of Quebec
* J, German mintmark for the city of Hamburg
* J short for Jahwist, one of the major authors of the Torah

ee also

* J/22 and J/24, sailboat classes
* J Mays, Group Vice President of Design and Chief Creative Officer at Ford Motor Company.
* J Dilla, a hip-hip performer and producer
* J-Zone, a hip-hop performer
* Jay-z, a hip-hop performer
*JJ
*JJJ

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