HH may refer to:

Organizations

HH Electronics HH Audio (Formerly HH Electronics) is a British amplifier manufacturer that was founded in 1968 by Mike Harrison, Malcolm Green and Graham Lowes in Harston near Cambridge, England, where its first Solid state (electronics), solid state TPA and MA ...

, 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 The Hedgehog signaling pathway is a signaling pathway that transmits information to embryonic cells required for proper cell differentiation. Different parts of the embryo have different concentrations of hedgehog signaling proteins. The pathwa ...

* hh blood group, a rare blood type *

Henderson–Hasselbalch equation In chemistry and biochemistry, the pH of weakly acidic Solution (chemistry), chemical solutions can be estimated using the Henderson-Hasselbach Equation: \ce = \ceK_\ce + \log_ \left( \frac \right) The equation relates the pH of the weak ac ...

, in biology and chemistry *

Herbig–Haro object Herbig–Haro (HH) objects are bright patches of nebula, nebulosity associated with newborn stars. They are formed when narrow jets of partially plasma (physics), ionised gas ejected by stars collide with nearby clouds of gas and dust at several ...

, in astronomy * Hitchhiker Program, a NASA program established in 1984 *

Hodgkin–Huxley model The Hodgkin–Huxley model, or conductance-based model, is a mathematical model that describes how action potentials in neurons are initiated and propagated. It is a set of nonlinear differential equations that approximates the electrical engine ...

, an electrical model of neurons *

Microsoft Compiled HTML Help Microsoft Compiled HTML Help (CHM) is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM. Th ...

(hh.exe) * Hereditary haemochromatosis

Transportation

HH (Court Street Shuttle) HH was the last of the letters assigned to original routes of the Independent Subway System of the New York City Subway in the 1930s. It was designated as the dedicated service letter of the IND Fulton Street Line in Brooklyn. The letter was in ...

, on the New York City Subway 1936–1946 * HH (Rockaway Shuttle), on the New York City Subway 1962–1972 * HH Ferry route between Helsingborg, Sweden, and Helsingør, Denmark *

HH Tunnel The HH Tunnel (alt. Helsingtunnel) is a proposed series of tunnels under Øresund between Helsingborg in Sweden and Helsingør in Denmark. The connection is planned for passenger trains, and other proposals for the tunnels include freight rail a ...

a proposed series of tunnels between Helsingborg and Helsingør

Entertainment

* Heil Hitler (Kanye West song), a alternative name for the song to bypass social media censorship * HH, the production code for the 1967 ''Doctor Who'' serial '' The Moonbase'' * Higglytown Heroes, an American animated series *

Horrible Histories ''Horrible Histories'' is an educational entertainment franchise encompassing many media including books, magazines, audio books, stage shows, TV shows, and more. In 2013, Lisa Edwards, UK publishing and commercial director of Scholastic Corpo ...

, media franchise

People

* Heath Hitler, White supremacist *

Hulk Hogan Terry Gene Bollea (; born August 11, 1953), better known by his ring name Hulk Hogan, is an American retired Professional wrestling, professional wrestler. He is signed to WWE as a brand ambassador. Known for his flamboyance and massive physiq ...

, American professional wrestler * Herbert Huncke, American writer * Hakainde Hichilema, Zambian politician

Terms and phrases

* hh (digraph), in several languages * hh, an abbreviation for "

hands A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "han ...

high" when referring to the height of a horse * HH, short for Hand-Held, a term in film production among camera staff *

Heil Hitler The Nazi salute, also known as the Hitler salute, or the ''Sieg Heil'' salute, is a gesture that was used as a greeting in Nazi Germany. The salute is performed by extending the right arm from the shoulder into the air with a straightened han ...

, a chant prevalent in Nazi Germany and neo-Nazi groups * His

Highness Highness (abbreviation HH, oral address Your Highness) is a formal style used to address (in second person) or refer to (in third person) certain members of a reigning or formerly reigning dynasty. It is typically used with a possessive adjec ...

, or Her Highness, a formal address *

His Holiness The title His Holiness (and the associated form of address Your Holiness) is an official title or style referring to the pope in the Catholic Church; this use can be traced back several hundred years. It has also been adopted as an official tit ...

, or Her Holiness, a formal address

Places

Hamburg Hamburg (, ; ), officially the Free and Hanseatic City of Hamburg,. is the List of cities in Germany by population, second-largest city in Germany after Berlin and List of cities in the European Union by population within city limits, 7th-lar ...

, Germany (ISO 3166-2 code DE-HH) and HH ("Hansestadt Hamburg"), vehicle licence plate prefix * Hilton Head Island, South Carolina, an island off the coast of South Carolina, United States

Other uses

* HH, a brassiere cup size *

Habbo ''Habbo'', also called ''Habbo Hotel'', is a virtual world and massively multiplayer online game. It is owned and operated by Sulake. Founded in 2000, ''Habbo'' has expanded to nine online communities (or "hotels"), with users from more tha ...

, online community formerly known as Habbo Hotel *

Happy Hour Happy hour is a marketing term for a time when a venue such as a restaurant or bar offers reduced prices on alcoholic drinks. Discounted menu items like appetizers are often served during happy hour. This is a way for bars and restaurants to ...

, a period of time (not necessarily one hour) when bars and restaurants offer discounts on food and/or drinks * HH, the name for the former mascot of the electronics/appliances store H. H. Gregg {{disambiguation