From Wikipedia, the free encyclopedia
|Look up HH in Wiktionary, the free dictionary.|
HH may refer to:
- Hh, a signalling molecule in Drosophila named for the Hedgehog signaling pathway
- hh antigen system, a rare blood group
- Hodgkin–Huxley model
- Logo of Helly Hansen, a Norwegian clothing maker
- His Highness, or Her Highness
- His Holiness, or Her Holiness
- H.H., pseudonym for American poet and writer Helen Hunt Jackson
- DE-HH, ISO 3166-2 code for Hamburg, and HH, vehicle licence plate prefix
- HH (Court Street Shuttle) a defunct line on the New York City Subway from 1936 to 1946
- HH (Rockaway Shuttle), from 1962 to 1972
Science and technology
- Henderson–Hasselbalch equation
- Herbig–Haro object, astronomy
- Hitchhiker Program, a NASA program established in 1984
- H. H. is pseudonym employed by Søren Kierkegaard in his Two Minor Ethical-Religious Essays.
- hh (digraph)
- Air Hamburg, a German airline based in Hamburg by IATA code
- HH, brassiere cup size
- hh, abbreviation for "hands high" when referring to the height of a horse
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