H2

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

Roads and transportation

• Interstate H-2, a highway in Hawaii, located on the island of Oahu
• London Buses route H2
• HII, the IATA airport code for Lake Havasu City Airport

Science

• Hydrogen-2, H-2, ²H (called deuterium), the isotope of hydrogen with one proton, one neutron, and one electron
• Dihydrogen, or H₂, molecular hydrogen composed of two hydrogen atoms
• H II region, an astrophysical cloud in which star formation takes place
• ATC code H02 Corticosteroids for systemic use, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Histamine H₂ receptor
• Prostaglandin H2
• H-2, the Major Histocompatibility Complex of the mouse (equivalent of the Human Leukocyte Antigens)
• *h₂, one of the three laryngeals in the reconstructed Proto-Indo-European language
• H² or h², wide- or narrow-sense heritability

Vehicles

• H2 lamp, a halogen headlamp
• H02 locomotive (Germany), a high-pressure steam locomotive made in 1930
• H-II, a family of Japanese liquid-fueled rockets
  • H-IIA
  • H-IIB
  • H-II Transfer Vehicle, a Japan Aerospace Exploration Agency unmanned spacecraft
• 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
• Hummer H2, a car model
• Kawasaki H2 Mach IV, a model of motorcycle
• Landgraf H-2, an American single-seat twin-rotor helicopter produced in 1944
• LB&SCR H2 class, a British LB&SCR locomotive
• PRR H2, a model within the American PRR locomotive classification
• Saxon XII H2, a German steam locomotive produced in 1922
• Standard H-2, a U.S. Army reconnaissance plane produced in 1916
• USS H-2 (SS-29), a U.S. Navy H-class submarine commissioned in 1913

Other

• H2 (DBMS), an open source Java SQL database management system
• H2 (manga), a baseball manga by Mitsuru Adachi
• H-2A Visa, a United States visa for temporary or seasonal agricultural work
  • H-2 Worker, a 1990 documentary film about the exploitation of workers in Florida's sugar cane industry
• British NVC community H2, a heath community in the British National Vegetation Classification system
• DSC-H2, a 2006 Sony Cyber-shot H series camera
• H-2 MUPSOW, a precision-guided glide bomb manufactured by Pakistan
• H2 is the rebranded name of the former channel, History International, a spin off of History (formerly The History Channel).

See also

• H02, a code for "Other inflammation of eyelid" in ICD-10 Chapter VII: Diseases of the eye, adnexa
• SH-2 Seasprite, an American helicopter
• H2, the second half of the business year
• Halo 2, a video game for the Xbox, created and developed by Bungie
• Halloween II (2009 film)
• Sky Airline IATA code
• Harrison Number Two, an 18th century marine chronometer built by John Harrison
• Hollywood Squares, referred to as H² informally during the 2002-2004 seasons
• H2, a model of hurricane tie manufactured by Simpson Strong-Tie Co.