H3, H03 or H-3 may refer to:

Entertainment

* ''H3'' (film), a 2001 film about the 1981 Irish hunger strike * ''

H3 – Halloween Horror Hostel H3 – Halloween Horror Hostel is a 2008 German horror-parody television film, part of the TV series '. The film was directed by Michael Karen and written by Stefan Barth. Plot During a cooking show, Tim Mälzer got repeated phone calls fro ...

'', a 2008 German horror-parody television film * '' Happy Hustle High'', a manga series by Rie Takada, originally titled "H3 School!" * h3h3Productions, styled " 3, a satirical YouTube channel

Science

Triatomic hydrogen Triatomic hydrogen or H3 is an unstable triatomic molecule containing only hydrogen. Since this molecule contains only three atoms of hydrogen it is the simplest triatomic molecule and it is relatively simple to numerically solve the quantum mechan ...

(H₃), an unstable molecule * Trihydrogen cation (H₃⁺), one of the most abundant ions in the universe * Tritium (³H), or hydrogen-3, an isotope of hydrogen *

ATC code H03 H03A Thyroid preparations H03AA Thyroid hormones :H03AA01 Levothyroxine sodium :H03AA02 Liothyronine sodium :H03AA03 Combinations of levothyroxine and liothyronine :H03AA04 Tiratricol :H03AA05 Thyroid gland preparations H03B Antithyroid pre ...

''Thyroid therapy'', a subgroup of the Anatomical Therapeutic Chemical Classification System *

British NVC community H3 NVC community H3 (''Ulex minor - Agrostis curtisii'' heath) is one of the heath communities in the British National Vegetation Classification system. It is one of three communities which are considered transitional between the lowland dry heaths a ...

, a heath community of the British National Vegetation Classification system * Histamine H₃ receptor, a human gene *

Histone H3 Histone H3 is one of the five main histones involved in the structure of chromatin in eukaryotic cells. Featuring a main globular domain and a long N-terminal tail, H3 is involved with the structure of the nucleosomes of the 'beads on a stri ...

, a component of DNA higher structure in eukaryotic cells *

Hekla 3 eruption The Hekla 3 eruption (H-3) circa 1000 BC is considered the most severe eruption of Hekla during the Holocene. It threw about 7.3 km3 of volcanic rock into the atmosphere, placing its Volcanic Explosivity Index (VEI) at 5. This would have ca ...

, a huge volcanic eruption around 1000 BC

Computing

HTTP/3 HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web, complementing the widely-deployed HTTP/1.1 and HTTP/2. Unlike previous versions which relied on the well-established TCP ( ...

, the third major version of the Hypertext Transfer Protocol * Socket H3, a CPU socket * , the level-3 HTML heading markup element

Transportation

Air and space

* H3 (rocket), a Japanese expendable launch system *

H-3 Air Base H-3 Air Base (code-named 202C, 202D) is part of a cluster of former Iraqi Air Force bases in the Al-Anbar Governorate of Iraq. H3 is located in a remote stretch of Iraq's western desert, about 435 kilometers from Baghdad in western Iraq. It is cl ...

, a former Iraqi Air Force base in western Iraq *

Dynali H3 EasyFlyer The Dynali H3 EasyFlyer, now known as the Sport, is a Belgian helicopter designed and produced by the Dynali of the Thines district of Nivelles. The aircraft is supplied complete and ready-to-fly-aircraft or as a kit for amateur construction. ...

, a Belgian helicopter *

Howland H-3 Pegasus The Howland H-3 Pegasus is an American ultralight aircraft that was designed by Bert Howland and made available by Howland Aero Design in the form of plans for amateur construction, with kits provided by Aircraft Spruce & Specialty Co. The H ...

, an American ultralight aircraft * Sikorsky SH-3 Sea King, an American twin-engined anti-submarine warfare helicopter *

Standard H-3 The Standard H-2 was an early United States, American United States Army Air Corps, Army reconnaissance aircraft, ordered in 1916 in aviation, 1916. The H-2 was built by the Standard Aircraft Corporation, and previously known as the Sloane H-2. I ...

, an early American reconnaissance aircraft *

VFW-Fokker H3 Sprinter The VFW-Fokker H3 Sprinter was a single-engined experimental rotorcraft designed and built in West Germany. Two aircraft were produced by VFW-Fokker in the early 1970s, registered ''D-9543'' and ''D-9544''. Intended as the first of a family of t ...

, a West German experimental rotorcraft

Automobiles

Brilliance H3 The Brilliance H3 sedan is a compact car produced by Brilliance Auto aimed to replace the Brilliance H330 The Brilliance H330 sedan and Brilliance H320 hatchback duo are compact cars ( C) produced by Brilliance Auto aimed to replace the Brillia ...

, a Chinese compact sedan * Great Wall Haval H3, a Chinese compact SUV *

Huansu H3 The Huansu H3 is a 7-seat MPV produced by Huansu, a brand of the Chonqing Bisu Automotive Corporation, which is closely related to Beiqi-Yinxiang, a joint venture between Beijing Auto (Beiqi) and the Yinxiang Group The Yinxiang Group (银翔 ...

, a Chinese compact MPV * Hummer H3, an American mid-size SUV * IFA Horch H3, an East German lorry *

Rely H3 The Rely H series including the Rely H3, Rely H5, and Rely H6 is a series of light commercial van produced by the Chinese automobile manufacturer Chery under the Wanda (万达) branch and branded under the Rely (威麟) brand, a premium marque l ...

, a Chinese light commercial van

Rail

* Alstom Prima H3, a French diesel/battery hybrid locomotive *

GNR Class H3 The Great Northern Railway (Great Britain), Great Northern Railway Class H2 and H3 (classified K1 and K2 by the London and North Eastern Railway, LNER) was a class of 2-6-0 steam locomotive designed for mixed-traffic work. The class was creat ...

, a class of British steam locomotives * H3 series of METRORail tramways in Houston

Roads

* H3 Monks Way, part of the Milton Keynes grid road system, United Kingdom *

Interstate H-3 Interstate H-3 (abbreviated H-3) is an Interstate Highway located entirely within the U.S. state of Hawaii on the island of Oahu. H-3 is also known as the John A. Burns Freeway. It crosses the Ko'olau Range along several viaducts and through th ...

, a highway in Hawaii

Ships

* ''H3'' (yacht), a luxury yacht * , a destroyer of the British Royal Navy * , a submarine of the British Royal Navy * , a submarine of the United States Navy

Other uses

* H3 (classification), a para-cycling classification *

H3 (Kuwait) H3 (also H3, as-Sabiyah) is an archaeological site in the Subiya Region (Kuwait) that was occupied during the second half of the sixth millennium BC. It was a cultural borderland between Neolithic Arabia and Mesopotamia. Among the finds at the s ...

, an archaeological site *

H3 (pyrotechnics) H3 is a pyrotechnic composition which is used mostly as a burst charge for small diameter shells. It is friction and shock sensitive, as are most compositions containing chlorates. For this reason, H3 should be mixed using the "diaper method" an ...

, a pyrotechnic composition * , one of the three laryngeals in the reconstructed Proto-Indo-European language * H3 Entertainment, a subsidiary of the film industry company The H Collective * ''

H3 Podcast h3h3Productions is a YouTube channel hosted by Ethan Klein and Hila Klein, an Israeli-American husband-and-wife duo. The majority of their content consists of reaction videos and sketch comedy in which they satirize Cyberculture, internet cultu ...

'', hosted by Ethan Klein *

Gerovital H3 Gerovital H3 (or procaine hydrochloride and products known as GH3 and other variants which may or may not be identical to Gerovital H3) is a preparation developed during the 1950s and promoted by its advocates as an effective anti-aging treatment. ...

, a pseudoscientific anti-aging treatment * Hash House Harriers, an international group of non-competitive running, social and drinking clubs * H3, an 18th-century marine chronometer by

John Harrison John Harrison ( – 24 March 1776) was a self-educated English Carpentry, carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the History of longitude, problem of calculating longitude while at s ...

* H3, a type of automotive halogen lamp * H3 Hardy Collaboration Architecture, a firm started by

Hugh Hardy Hugh Hardy (July 26, 1932 – March 17, 2017) was an American architect, known for designing and revitalizing theaters, performing arts venues, public spaces, and cultural facilities across the United States. ''The New Yorker'' writer Brendan ...

* DSC-H3, a 2008

Sony Cyber-shot Cyber-shot is Sony's line of point-and-shoot digital cameras introduced in 1996. Cyber-shot model names use a DSC prefix, which is an initialism for "Digital Still Camera". Many Cyber-shot models feature Carl Zeiss trademarked lenses, while othe ...

camera