J2

J2, J.II or J-2 may refer to:

Codes and classifications

J2, the IATA airline designator for Azerbaijan Airlines
J-2 visa, a nonimmigrant visa issued by the United States for spouses and dependents of J-1 visa exchange visitors
ATC code J02, a subgroup of the Anatomical Therapeutic Chemical Classification System
Haplogroup J2 (Y-DNA), a Y-DNA haplogroup
Janko group J2 in mathematics
Jinja2, a Python template engine that uses file extension .j2
$J_{2}\,$ , a celestial body's second dynamic form factor
$J_{2}\,$ , the second invariant of the deviatoric stress tensor

j2 Global Communications, a tech company best known for electronic fax services
J2 (music channel), a former New Zealand music TV Channel
TVB J2, former names of TVB Plus, a digital TV channel of Television Broadcasts Limited
J. League Division 2, the second-tier of Japanese professional association football
Jefatura de Inteligencia del Estado Mayor Conjunto de las Fuerzas Armadas (J-2), an Argentine intelligence agency
J2, the Intelligence Directorate of the United States Joint Chiefs of Staff
Director of Military Intelligence, the head of Irish Defence Forces intelligence, sometimes referred to as J2

Rocketdyne J-2, a rocket engine used in the Saturn rockets and intended for use on the Space Launch System
AEG J.II, a World War I German ground attack aircraft
Albatros J.II, a World War I German single-engine, single-seat, biplane ground-attack aircraft
Allard J2, any of several postwar American market-designed English cars
Auster J-2 Arrow, a 1945 British single-engined two-seat high-wing touring monoplane
HMAS J2, an Australian submarine
JAC J2, a city car produced by JAC Motors
Junkers J 2, a 1916 all-metal German fighter prototype aircraft
LB&SCR J2 class, a British LB&SCR locomotive
McCulloch J-2, a 1962 small, two-seat autogyro
MG J-type, a 2-seat sports car produced by the MG Car company from 1932 to 1934
Morris Commercial J2 small forward-control van produced from 1956 to 1967
Taylor J-2, a 1935 American two-seat light aircraft
Mikoyan-Gurevich MiG-15, an aircraft called J-2 in China

J2, a comicbook character, son of Juggernaut
J2 (orca), or Granny (c. 1936–1951 – c. 2016), a killer whale
J2 League, Japanese football league
County Route J2 (California)
S/2003 J 2, the provisional designation of Jupiter LXXIII, a retrograde irregular satellite of Jupiter
J2 (roller coaster), or Hell Cat, a roller coaster at Clementon Amusement Park
Johnson solid J2, the equilateral pentagonal pyramid
Rocketdyne J-2, a cryogenic rocket engine used on Saturn V Moon rocket
Samsung Galaxy J2, an Android smartphone
Samsung Galaxy J2 Prime, a successor smartphone, also known as the Samsung Galaxy J2 Ace
J2, an open-source clone of the Hitachi/Renesas SuperH-2 microcontroller
J2 coefficient, representing the oblateness of Earth
Nikon 1 J2, mirrorless interchangeable lens camera