J1
# J1

J1, J01, J.I, J-I or J-1 may refer to:

## Vehicles

### Aircraft

* AEG J.I, a World War I German ground attack aircraft
* Albatros J.I, a 1917 German ground-attack single-engine biplane aircraft
* Junkers J 1, a 1916 German aircraft
* Junkers J.I, a 1917 German aircraft
* Lawrance J-1, an early 1920s engine used in American aircraft

### Locomotives

* LB&SCR J1 class, a British LB&SCR locomotive
* LNER Class J1, a class of British steam locomotives
* PRR J1, an American PRR steam locomotive

### Other vehicles

* J-I rocket, a Japanese solid rocket expendable launch vehicle
* J1 type submarine, a World War II Imperial Japanese Navy cruiser submarines class
* HMS J1, a 1915 World War I British submarine
* JAC J1, a subcompact car
* Al Fahd 300 (J-1), an Iraqi surface-to-surface missile project

## In arts and entertainment

* J-1 World Heavyweight Championship, a professional wrestling competition
* J1 World Tour, a concert tour by Taiwanese singer Jolin Tsai
* J1 Live Concert, a 2005 live album by Taiwanese singer Jolin Tsai
* "J1" (song), a 2008 song by Mallu Magalhães
* J.I the Prince of N.Y, American rapper also known as J.I.

## In mathematics and science

* ATC code J01, Antibacterials for systemic use, a subgroup of the Anatomical Therapeutic Chemical Classification System
* Haplogroup J1 (Y-DNA), a Y-DNA haplogroup
* Janko group $J_1,$ in mathematics
* S/2003 J 1, a former name for Eukelade, a satellite of Jupiter
* First-order Bessel function of the first kind, denoted $j_{1}$
* J01, the ICD-10 code for acute sinusitis, a medical condition
* $J_1,$ the Johnson solid notation for an equilateral square pyramid

## Other uses

* J-1 visa, a type of U.S. visa for exchange visitors
* The J1 League, the top division of Japanese association football
* Samsung Galaxy J1, a smartphone
* J1, abbreviation, reference to the director staff of the Joint Chiefs of Staff
