H2

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

Roads and transportation

H₂, the chemical formula for hydrogen gas
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
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
$H^2$ or $h^2$ , wide- or narrow-sense heritability
<h2></h2>, level 2 heading markup for HTML Web pages, see HTML element#heading

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
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
Hummer H2, a car model
Kawasaki H2 Mach IV, 1970s two-stroke motorcycle
Kawasaki Ninja H2, 2010s supercharged motorcycle
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
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

Armenia 2 (H2), a private television company broadcasting in Armenia and Nagorno-Karabakh
H2 (TV network), 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

H-2A Visa, a United States visa for temporary or seasonal agricultural work
British NVC community H2, a heath community in the British National Vegetation Classification system
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 also identifies itself to other servers as h2 in TLS negotiation or h2c in the HTTP Upgrade header
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
H02, a code for "Other inflammation of eyelid" in ICD-10 Chapter VII: Diseases of the eye, adnexa
The LGA 1155 CPU socket is also known as Socket H2
Area H2, an Israeli controlled area under the Hebron Protocol