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 ''Happy Hustle High'', originally known as , is a Japanese manga series written and illustrated by Rie Takada. The series is published in Japan by Shogakukan and in the United States in English by VIZ Media. Plot ''Happy Hustle High'' follows ...

'', a manga series by Rie Takada, originally titled "H3 School!" *

h3h3Productions h3h3Productions is a YouTube channel created and hosted by American-Israeli YouTuber Ethan Klein. His content consists of reaction videos and sketch comedy in which he satirizes internet culture. The '' H3 Podcast'' is his current podcast ch ...

, 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 mecha ...

(H₃), an unstable molecule *

Trihydrogen cation The trihydrogen cation or protonated molecular hydrogen ( IUPAC name: hydrogen onium ion) is a cation (positive ion) with formula , consisting of three hydrogen nuclei (protons) sharing two electrons. The trihydrogen cation is one of the most a ...

(), one of the most abundant ions in the universe *

Tritium Tritium () or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with a half-life of ~12.33 years. The tritium nucleus (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus of the ...

(³H), or hydrogen-3, an isotope of hydrogen * ATC code H03 ''Thyroid therapy'', a subgroup of the Anatomical Therapeutic Chemical Classification System * British NVC community H3, 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 end, N-terminal tail, H3 is involved with the structure of the nucleosomes of the 'b ...

, a component of DNA higher structure in eukaryotic cells * Hekla 3 eruption, 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 LGA 1150, also known as Socket H3, is a zero insertion force flip-chip land grid array (LGA) CPU socket designed by Intel for CPUs built on the Haswell microarchitecture. This socket is also used by the Haswell's successor, Broadwel ...

, a CPU socket * , the level-3 HTML heading markup element

Transportation

Air and space

H3 (rocket) The H3 rocket is a Japanese expendable launch system. H3 launch vehicles are liquid-propellant rockets with strap-on solid rocket boosters and are launched from Tanegashima Space Center in Japan. Mitsubishi Heavy Industries (MHI) and JAXA are r ...

, a Japanese expendable launch system * H-3 Air Base, 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, an American ultralight aircraft *

Sikorsky SH-3 Sea King The Sikorsky SH-3 Sea King (company designation S-61) is an American twin-engine anti-submarine warfare (ASW) helicopter designed and built by Sikorsky Aircraft. A landmark design, it was one of the first ASW rotorcraft to use turboshaft engine ...

, an American twin-engined anti-submarine warfare helicopter *

Standard H-3 The Standard H-2 was an early American Army reconnaissance aircraft, ordered in 1916. The H-2 was built by the Standard Aircraft Corporation, and previously known as the Sloane H-2. It was an open-cockpit three-place tractor biplane, powered by a ...

, 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 series. Overview The engine options for the Brilliance H3 includes a 1.5-liter engine producing and a 1.5-liter turbo producing and 220& ...

, a Chinese compact sedan *

Great Wall Haval H3 The Great Wall Haval H3 (), also known as the Great Wall Hover, is a compact sport utility vehicle (SUV) produced by the Chinese manufacturer Great Wall Motors from April 2005 to 2012. It was the first Chinese car to be exported in large quantiti ...

, a Chinese compact SUV *

Huansu H3 The Huansu H3 is a 7-seat MPV produced by Huansu, a brand of the Chongqing 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� ...

, a Chinese compact MPV *

Hummer H3 The Hummer H3 is an off-road vehicle that was produced from 2005 to 2010 by General Motors. The smallest model of the Hummer lineup, it was offered as a 5-door SUV or a 4-door pickup truck known as the H3T. Unlike the larger Hummer H1, H1 and Hum ...

, an American mid-size SUV *

IFA Horch H3 The IFA Horch H3, also known as IFA H3, is a short bonnet lorry, and the first series production vehicle by East German VEB HORCH Kraftfahrzeug- und Motorenwerke Zwickau, later known as VEB Sachsenring Automobilwerke Zwickau. The short-lived H3 w ...

, 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 marque launche ...

, a Chinese light commercial van

Rail

Alstom Prima H3 Prima is a family of railway diesel and electric locomotives built by Alstom. Manufacture of the type commenced in the late 1990s. By 2008, Alstom had reportedly sold 1,750 Prima locomotives. The second generation Prima II was launched in 2009. T ...

, a French diesel/battery hybrid locomotive *

GNR Class H3 The Great Northern Railway Class H2 and H3 (classified K1 and K2 by the LNER) was a class of 2-6-0 steam locomotive designed for mixed-traffic work. The class was created as a locomotive which could haul heavier goods trains at speeds of up ...

, a class of British steam locomotives * H3 series of

METRORail METRORail is the light rail system in Houston, Texas (United States). In , the system had a ridership of , or about per weekday as of . METRORail ranks as the second most-traveled light rail system in the Southern United States and the List ...

tramways in Houston

Roads

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

Interstate H-3 Interstate H-3 (H-3) is an Interstate Highway located entirely within the US state of Hawaii on the island of Oʻahu. H-3 is also known as the John A. Burns Freeway, after the second governor of Hawaii. It crosses the Koʻolau Range a ...

, 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) H3 is a para-cycling classification. The UCI recommends this be coded as MH3 or WH3. Definition Union Cycliste Internationale (UCI) defines H3 as: H3.1 (ex-H2.1) * Paraplegic with impairments corresponding to a complete lesion from Th1 to Th3 * ...

, 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 the Mesopotamian and the Arabian Neolithic. Finds at the si ...

, an archaeological site * H3 (pyrotechnics), 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 The ''H3 Podcast'' is a live commentary podcast hosted by Ethan Klein. The show airs on YouTube and started in 2016. The ''H3 Podcast'' is among the most listened-to podcasts in the United States. According to the 2023 U.S. Podcast Report by T ...

'', hosted by Ethan Klein * Gerovital H3, a pseudoscientific anti-aging treatment *

Hash House Harriers The Hash House Harriers (HHH or H3) is an international group of non-competitive running social clubs. An event organized by a club is known as a Hash or Run, or a Hash Run. A common denominal verb for this activity is Hashing, with participant ...

, 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 an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the History of longitude, problem of how to calculate longitude while at sea. Harrison's sol ...

* 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 camera, 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 AG, ...

camera