# H2

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

## Arts and media

- [Armenia 2](/source/Armenia_2) (H2), a private television company broadcasting in Armenia and Nagorno-Karabakh
- [H2 (A&E Networks)](/source/H2_(A%26E_Networks)), the rebranded name of the former channel *History International* - [H2 (American TV channel)](/source/H2_(American_TV_channel)), the American version of the channel
- [*H2* (manga)](/source/H2_(manga)), a baseball manga by Mitsuru Adachi
- *[Halo 2](/source/Halo_2)*, a video game for the Xbox, created and developed by Bungie
- [*Halloween II* (2009 film)](/source/Halloween_II_(2009_film)), initially abbreviated to *H2*
- *[Hollywood Squares](/source/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](/source/HTML_element#heading)
- [H2 Database Engine](/source/H2_Database_Engine), a [DBMS](/source/DBMS) written in Java
- [DSC-H2](/source/DSC-H2), a 2006 Sony Cyber-shot H series camera
- [HTTP/2](/source/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](/source/LGA_1155) CPU socket, also known as Socket H2

## Roads and transportation

- [Interstate H-2](/source/Interstate_H-2), a highway in Hawaii, located on the island of Oahu
- [London Buses route H2](/source/London_Buses_route_H2)

## Science and mathematics

### Biology and medicine

- [ATC code H02](/source/ATC_code_H02) *Corticosteroids for systemic use*, a subgroup of the Anatomical Therapeutic Chemical Classification System
- [British NVC community H2](/source/British_NVC_community_H2), a heath community in the British National Vegetation Classification system
- [Histamine H2 receptor](/source/Histamine_H2_receptor)
- [Prostaglandin H2](/source/Prostaglandin_H2)
- H-2, the [Major histocompatibility complex](/source/Major_histocompatibility_complex) of the mouse (equivalent of the Human Leukocyte Antigens)
- H^2 or h^2, wide- or narrow-sense [heritability](/source/Heritability)

### Chemistry

- H2, the chemical formula for [hydrogen](/source/Hydrogen) gas (dihydrogen)
- [Deuterium](/source/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](/source/H_II_region), a region of interstellar atomic hydrogen that is ionized
- The [Hardy space](/source/Hardy_space) [H2](/source/H_square)

## Vehicles

### Air and space

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

### Automobiles

- [Haval H2](/source/Haval_H2), a Chinese subcompact SUV
- [Hummer H2](/source/Hummer_H2), an American full-size SUV

### Motorcycles

- [Kawasaki H2 Mach IV](/source/Kawasaki_H2_Mach_IV), 1970s two-stroke motorcycle
- [Kawasaki Ninja H2](/source/Kawasaki_Ninja_H2), 2010s supercharged motorcycle

### Rail

- [LB&SCR H2 class](/source/LB%26SCR_H2_class), a British LB&SCR locomotive
- [GNR Class H2](/source/GNR_Class_H2), a class of British steam locomotives
- [LNER Class H2](/source/LNER_Class_H2), a class of British steam locomotives
- [H02 locomotive (Germany)](/source/H02_locomotive_(Germany)), a high-pressure steam locomotive made in 1930
- [Saxon XII H2](/source/Saxon_XII_H2), a German steam locomotive produced in 1922
- PRR H2, a model within the American [PRR locomotive classification](/source/PRR_locomotive_classification)
- H2, designation for [METRORail](/source/METRORail) [Siemens S70](/source/Siemens_S70) light rail vehicles

### Sea

- [HMAS *Success* (H02)](/source/HMAS_Success_(H02)), a Royal Australian Navy Admiralty S-class destroyer completed in 1918
- [HMS *Exmouth* (H02)](/source/HMS_Exmouth_(H02)), a British Royal Navy E-class destroyer commissioned in 1934
- [HMS *H2*](/source/HMS_H2), a British Royal Navy H class submarine commissioned in 1915
- [USS *H-2* (SS-29)](/source/USS_H-2_(SS-29)), a U.S. Navy H-class submarine commissioned in 1913

## Other uses

- *[*h₂](/source/*h2)*, one of the three laryngeals in the reconstructed [Proto-Indo-European](/source/Proto-Indo-European) language
- [H-2 Air Base](/source/H-2_Air_Base), a military air base in Iraq
- [H2 (classification)](/source/H2_(classification)), a para-cycling classification
- [H-2A Visa](/source/H-2A_Visa), a United States visa for temporary or seasonal agricultural work
- H2, the second half of the [business year](/source/Business_year)
- H2 lamp, a halogen vehicle [headlamp](/source/Headlamp) no longer manufactured
- H2, a model of [hurricane tie](/source/Hurricane_tie) manufactured by Simpson Strong-Tie Co.
- [Sky Airline](/source/Sky_Airline) (IATA code H2)
- Area H2, an Israeli-controlled area under the [Hebron Protocol](/source/Protocol_Concerning_the_Redeployment_in_Hebron)
- H2 as the nickname for New Zealand civil servant [Heather Simpson](/source/Heather_Simpson_(civil_servant))
- Unitree H2, a [humanoid robot](/source/Humanoid_robot) developed by [Unitree Robotics](/source/Unitree_Robotics)

## See also

- [HII (disambiguation)](/source/HII_(disambiguation))
- [SH-2 Seasprite](/source/SH-2_Seasprite), an American helicopter
- Harrison Number Two, an 18th-century marine chronometer built by [John Harrison](/source/John_Harrison)
- [2H (disambiguation)](/source/2H_(disambiguation))

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Adapted from the Wikipedia article [H2](https://en.wikipedia.org/wiki/H2) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/H2?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.