J

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 (programming language)
• J# programming language for the Microsoft .NET Framework
• J (text editor), written in Java
• J operator, a programming construct
• J (operating system), an operating system for ICL's System 4 series of computers

Genetics and medicine

• Haplogroup J (mtDNA)
• Haplogroup J (Y-DNA)
• ATC code J Antiinfectives for systemic use, a section of the Anatomical Therapeutic Chemical Classification System

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 () in fields where i is traditionally used for another value
• J, one name (by Samuel C. C. Ting) for the J/ψ particle
• J-coupling, indirect dipole-dipole coupling between two nuclear spins

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 Last Stop: Crappy Town.

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.

Miscellania

• J, slang for Joint (cannabis)
• J band, radio frequencies ranges from 10 to 20 GHz
• J (psychedelic)
• J (New York City Subway service)
• Elgin, Joliet and Eastern Railway, a Chicago railway sometimes referred to as "The J".
• 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
• j. A weekly newspaper serving the Jewish community in Northern California.
• J is the narrator of Jerome K. Jerome's novel Three Men in a Boat.

See also

• J/22, J/24 and J/80 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
• Jay
• Jay Jay

This disambiguation page lists articles associated with the same Latin letter. If an internal link led you here, you may wish to change the link to point directly to the intended article.