H2

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

• <h2></h2>, level 2 heading markup for HTML Web pages, see HTML element#heading
• H2 (database), an open-source Java SQL database-management system
• 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)
• ${\displaystyle H^{2}}$ or ${\displaystyle h^{2}}$, 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
• *h₂, one of the three laryngeals in the reconstructed Proto-Indo-European language
• 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

• 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

1. Hummer H2
2. Kawasaki Ninja H2
3. Hollywood Squares
4. H2 receptor antagonist
5. Kawasaki H2
6. H2 (database)
7. Histamine H2 receptor
8. Antihistamine
9. Hydrogen
10. Liquid hydrogen
11. H2 (A&E Networks)
12. Hummer
13. H2-CBD
14. Hydrogen production
15. Kawasaki H2 Mach IV
16. H2 (manga)
17. Prostaglandin H2
18. Biotin
19. H2 Ventures
20. Haval H2