hh antigen system, a rare blood groupHh, a signalling molecule in Drosophila named for the Hedgehog signaling pathwayHodgkin–Huxley model
Science and technology
Hahnium, a disputed abbreviation for the chemical element nameHandheld deviceHenderson–Hasselbalch equationHerbig-Haro object, astronomyHitchhiker Program,a NASA program established in 1984
Movies, music and the arts
H.H., a webcomic by Daniel KimHoratio Hornblower, fictional officer of the British Royal NavyHarvest Home (film), a 2009 short film directed by Craig WhitneyHorrible Histories (2009 TV series), a popular British comedy sketch show
People
H. H. Holmes, serial killer Herman Webster MudgettHal Holbrook, American actorHarry Hamlin, American actorHarry Houdini, American magicianHelen Hayes, American actressHelen Hunt, American actressHenry Hyde, American politicianHerbert Hoover, the 31st President of the United StatesHenry Hudson, English sea explorerHolly Hunter, American actressHorace Harding, American financierHoward Hanson, American composerHoward Hesseman, American actorHoward Hughes, American industrialistHubert Humphrey, American statesmanHugh Hefner, American magazine publisherHulk Hogan, American professional wrestlerHermann Hesse, Swiss-German poetHeinrich Heine, German poet
Places
Hamburg, meaning Hansestadt HamburgHansestadt, Hanseatic CityHart House, an historic building at the University of Torontohhgregg, an appliance and electronics retailer based out of Indianapolis, IndianaHH (Rockaway Shuttle), from 1962 to 1972HH (Court Street Shuttle) a defunct line on the New York City Subway from 1936 to 1946Hatboro-Horsham High School, South Eastern PA
Other
Hamburger Helperhh, hands highHH, brassiere cup sizehh, a falconer's abbreviation for Harris hawkHeavy haulerHeil Hitler, the Hitler salute, an abbreviation used by neo-nazisHelly Hansen, a Norwegian extreme foul weather clothing and textile makerHis Highness, or Her HighnessHis Holiness, or Her HolinessHappy Hour
