H3, H03 or H-3 may refer to:

Entertainment

  • H3 (film), a 2001 film about the 1981 Irish hunger strike
  • H3 – Halloween Horror Hostel, a 2008 German horror-parody television film
  • Happy Hustle High, a manga series by Rie Takada, originally titled "H3 School!"
  • h3h3Productions, styled "[h3]", a satirical YouTube channel

Science

  • Triatomic hydrogen (H<sub>3</sub>), an unstable molecule
  • Trihydrogen cation (), one of the most abundant ions in the universe
  • Tritium (<sup>3</sup>H), 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 H<sub>3</sub> receptor, a human gene
  • Histone H3, a component of DNA higher structure in eukaryotic cells
  • Hekla 3 eruption, a huge volcanic eruption around 1000 BC

Computing

  • HTTP/3, the third major version of the Hypertext Transfer Protocol
  • Socket H3, a CPU socket
  • , the level-3 HTML heading markup element
  • H3, a geospatial indexing system based on a discrete global grid, developed by Uber

Transportation

Air and space

  • H3 (rocket), a Japanese expendable launch system
  • H-3 Air Base, a former Iraqi Air Force base in western Iraq
  • Dynali H3 EasyFlyer, a Belgian helicopter
  • Howland H-3 Pegasus, an American ultralight aircraft
  • Sikorsky SH-3 Sea King, an American twin-engined anti-submarine warfare helicopter
  • Standard H-3, an early American reconnaissance aircraft
  • VFW-Fokker H3 Sprinter, a West German experimental rotorcraft

Automobiles

  • Brilliance H3, a Chinese compact sedan
  • Great Wall Haval H3, a Chinese compact SUV
  • Huansu H3, a Chinese compact MPV
  • Hummer H3, an American mid-size SUV
  • IFA Horch H3, an East German lorry
  • Rely H3, a Chinese light commercial van

Rail

  • Alstom Prima H3, a French diesel/battery hybrid locomotive
  • GNR Class H3, 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, 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), 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, hosted by Ethan Klein
  • Gerovital H3, 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
  • H3, a type of automotive halogen lamp
  • H3 Hardy Collaboration Architecture, a firm started by Hugh Hardy
  • DSC-H3, a 2008 Sony Cyber-shot camera

See also

  • 3H (disambiguation)
  • HHH (disambiguation)
  • Triple H (disambiguation)