J (disambiguation)

J is the tenth letter of the Latin alphabet. J may also refer to:

• Palatal approximant in the International Phonetic Alphabet
• Jocelyn, a well-known Australian socialite, often described as "the next Paris Hilton"

In astronomy:

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

In genetics

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

In mathematics:

• Bessel function
• j, the second imaginary unit of a quaternion

In physics:

• Joule, the SI unit of energy
• Current density
• Polar moment of inertia
• j, the imaginary unit (<math>\sqrt{-1}</math>) in fields where i is traditionally used for another value

In music:

• J (singer), a K-pop singer
• J (musician), a Japanese musician
• J Records, a record label

In film and television:

• Agent J, a character in the Men in Black films portrayed by Will Smith
• J, an antagonist in Bobobo

In other uses:

• J programming language
• J band, radio frequencies ranges from 10 to 20 GHz
• J (psychedelic)
• J (New York City Subway service)
• J, the pseudonym of Indian artist Jeyaraj
• 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

See also

• J/22 and J/24, sailboat classes
• J Dilla, a hip-hip musician and producer
• J-Zone, a hip-hop musician
• Jay-z, a hip-hop musician
• JJ
• JJJ