Look up HH in Wiktionary, the free dictionary.
HH may refer to:
Organizations
- HH Electronics, a British amplifier manufacturer
- Happy Hippie Foundation, a non-profit organization founded by Miley Cyrus
- Hartmann House Preparatory School, an independent preparatory school in Harare, Zimbabwe
- Heirs Holdings, a Nigerian conglomerate with diversified interests
- Helly Hansen, a Norwegian brand specializing in clothing and gear for oceans and mountains
- Heywood Hill, a bookshop in London
Science and technology
- Hh, a signalling molecule in Drosophila named for the Hedgehog signaling pathway
- hh blood group, a rare blood type
- Henderson–Hasselbalch equation, in biology and chemistry
- Herbig–Haro object, in astronomy
- Hitchhiker Program, a NASA program established in 1984
- Hodgkin–Huxley model, an electrical model of neurons
- Microsoft Compiled HTML Help (hh.exe)
- Hereditary haemochromatosis
Transportation
- HH (Court Street Shuttle) a defunct line on the New York City Subway from 1936 to 1946
- HH (Rockaway Shuttle), from 1962 to 1972
- HH Ferry route between Helsingborg, Sweden, and Helsingør, Denmark
- HH Tunnel a proposed series of tunnels between Helsingborg and Helsingør
- Air Hamburg, a German airline based in Hamburg (IATA code HH)
Other uses
- hh (digraph), in several languages
- HH, a brassiere cup size
- hh, an abbreviation for "hands high" when referring to the height of a horse
- HH, short for Hand-Held, a term in film production among camera staff
- HH, the production code for the 1967 Doctor Who serial The Moonbase
- Habbo, online community formerly known as Habbo Hotel
- Hakainde Hichilema, Zambian politician
- Hamburg, Germany (ISO 3166-2 code DE-HH) and HH ("Hansestadt Hamburg"), vehicle licence plate prefix
- Happy Hour, a period of time (not necessarily one hour) when bars and restaurants offer discounts on food and/or drinks
- Heath Hitler, White supremacist
- Heil Hitler, a chant prevalent in Nazi Germany and neo-Nazi groups
- His Highness, or Her Highness, a formal address
- His Holiness, or Her Holiness, a formal address
- Horrible Histories, media franchise
- Hulk Hogan, American professional wrestler
- Herbert Huncke, American writer
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