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

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 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.

Miscellanea

• J, slang for Joint (cannabis)
• J (programming language)
• 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
• J (text editor), written in Java

See 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