H2 (A

H2, H02, or H-2 may refer to:

Arts and media

* Armenia 2 (H2), a private television company broadcasting in Armenia and Nagorno-Karabakh
* H2 (A&E Networks), the rebranded name of the former channel ''History International''
** H2 (American TV channel), the American version of the channel
* ''H2'' (manga), a baseball manga by Mitsuru Adachi
* ''Halo 2'', a video game for the Xbox, created and developed by Bungie
* ''Halloween II'' (2009 film), initially abbreviated to ''H2''
* '' Hollywood Squares'', referred to as ''H²'' informally during the 2002–2004 seasons

Computing

* , level 2 heading markup for HTML Web pages, see HTML element#heading
* H2 Database Engine, a DBMS written in Java
* DSC-H2, a 2006 Sony Cyber-shot H series camera
* HTTP/2, major revision of HTTP, often abbreviated in discussions as h2, and identifying itself to other servers as h2 in TLS negotiation or h2c in the HTTP Upgrade header
* LGA 1155 CPU socket, also known as Socket H2

Roads and transportation

* Interstate H-2, a highway in Hawaii, located on the island of Oahu
* London Buses route H2

Science and mathematics

Biology and medicine

* ATC code H02 ''Corticosteroids for systemic use'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* British NVC community H2, a heath community in the British National Vegetation Classification system
* Histamine H₂ receptor
* Prostaglandin H2
* H-2, the Major histocompatibility complex of the mouse (equivalent of the Human Leukocyte Antigens)
* $H^2$ or $h^2$, wide- or narrow-sense heritability

Chemistry

* H₂, the chemical formula for hydrogen gas (dihydrogen)
* Deuterium (Hydrogen-2, H-2, ²H), the isotope of hydrogen with one proton, one neutron, and one electron

Other uses in science and mathematics

* H II region, a region of interstellar atomic hydrogen that is ionized
* The Hardy space H²

Vehicles

Air and space

* H-II, a family of Japanese liquid-fueled rockets
** H-IIA
** H-IIB
** H-II Transfer Vehicle, a Japan Aerospace Exploration Agency uncrewed spacecraft
* H-2 MUPSOW, a precision-guided glide bomb manufactured by Pakistan
* Landgraf H-2, an American single-seat twin-rotor helicopter produced in 1944
* Standard H-2, a U.S. Army reconnaissance plane produced in 1916

Automobiles

* Haval H2, a Chinese subcompact SUV
* Hummer H2, an American full-size SUV

Motorcycles

* Kawasaki H2 Mach IV, 1970s two-stroke motorcycle
* Kawasaki Ninja H2, 2010s supercharged motorcycle

Rail

* LB&SCR H2 class, a British LB&SCR locomotive
* GNR Class H2, a class of British steam locomotives
* LNER Class H2, a class of British steam locomotives
* H02 locomotive (Germany), a high-pressure steam locomotive made in 1930
* Saxon XII H2, a German steam locomotive produced in 1922
* PRR H2, a model within the American PRR locomotive classification
* H2, designation for METRORail Siemens S70 light rail vehicles

Sea

* HMAS ''Success'' (H02), a Royal Australian Navy Admiralty S-class destroyer completed in 1918
* HMS ''Exmouth'' (H02), a British Royal Navy E-class destroyer commissioned in 1934
* HMS ''H2'', a British Royal Navy H class submarine commissioned in 1915
* USS ''H-2'' (SS-29), a U.S. Navy H-class submarine commissioned in 1913

Other uses

* , one of the three laryngeals in the reconstructed Proto-Indo-European language
* H-2 Air Base, a military air base in Iraq
* H2 (classification), a para-cycling classification
* H-2A Visa, a United States visa for temporary or seasonal agricultural work
* H2, the second half of the business year
* H2 lamp, a halogen vehicle headlamp no longer manufactured
* H2, a model of hurricane tie manufactured by Simpson Strong-Tie Co.
* Sky Airline (IATA code H2)
* Area H2, an Israeli-controlled area under the Hebron Protocol
*H2 as the nickname for New Zealand civil servant Heather Simpson

See also

* HII (disambiguation)
* SH-2 Seasprite, an American helicopter
* Harrison Number Two, an 18th-century marine chronometer built by John Harrison
* 2H (disambiguation)

{{Letter-Number Combination Disambiguation