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 (TV channel), the rebranded name of the former channel History International
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 (DBMS), 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
H02, a code for "Other inflammation of eyelid" in ICD-10 Chapter VII: Diseases of the eye, adnexa
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)
Hydrogen-2, H-2, 2H (called deuterium), 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
, 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 unmanned 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
Rail
LB&SCR H2 class, a British LB&SCR locomotive
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
Road
Hummer H2, a car model
Kawasaki H2 Mach IV, 1970s two-stroke motorcycle
Kawasaki Ninja H2, 2010s supercharged motorcycle
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-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.