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) or , 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 Unitree H2, a humanoid robot developed by Unitree Robotics
See also HII (disambiguation) SH-2 Seasprite, an American helicopter Harrison Number Two, an 18th-century marine chronometer built by John Harrison 2H (disambiguation)