// Workers AI · dad joke modeWhat did H2 say to H2? You're my bond.

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

<h2></h2>, 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

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)
$H^{2}$ or $h^{2}$ , wide- or narrow-sense heritability

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

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

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

*h₂, 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