HH may refer to:
Organizations
*
Happy Hippie Foundation
The Happy Hippie Foundation is an American non-profit organization founded by entertainer Miley Cyrus on September 17, 2014, and officially launched to the public on May 5, 2015. The foundation focuses on youth homelessness (particularly among L ...
, 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 pathway ...
*
hh blood group, a rare blood type
*
Henderson–Hasselbalch equation
In chemistry and biochemistry, the Henderson–Hasselbalch equation
:\ce = \ceK_\ce + \log_ \left( \frac \right)
relates the pH of a chemical solution of a weak acid to the numerical value of the acid dissociation constant, ''K''a, of acid a ...
, in biology and chemistry
*
Herbig–Haro object, 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 charac ...
, an electrical model of neurons
*
Microsoft Compiled HTML Help
Microsoft Compiled HTML Help 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, for C ...
(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
*
Air Hamburg, a German airline based in Hamburg (IATA code HH)
Other uses
*
hh (digraph)
This is a list of digraphs used in various Latin alphabets. Capitalisation involves only the first letter (''ch'' becomes ''Ch'') unless otherwise stated (''ij'' becomes ''IJ'').
Letters with diacritics are arranged in alphabetic order accordin ...
, 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''
*
Hakainde Hichilema
Hakainde Hichilema (born 4 June 1962) is a Zambian businessman, farmer, and politician who is the seventh and current president of Zambia since 24 August 2021. After having contested five previous elections in 2006, 2008, 2011, 2015 and 201 ...
, Zambian politician
*
Hamburg
Hamburg (, ; nds, label=Hamburg German, Low Saxon, Hamborg ), officially the Free and Hanseatic City of Hamburg (german: Freie und Hansestadt Hamburg; nds, label=Low Saxon, Friee un Hansestadt Hamborg),. is the List of cities in Germany by popul ...
, 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
*
Heil Hitler, a chant prevalent in Nazi Germany and neo-Nazi groups
* His
Highness, 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; this use can be traced back several hundred years. It is also an official title for Oriental Orthodox patriarchs or ...
, or Her Holiness, a formal address
*
Horrible Histories, media franchise
*
Hulk Hogan
Terry Eugene Bollea (; born August 11, 1953), better known by his ring name Hulk Hogan, is an American retired professional wrestler. He is widely regarded as the most recognized wrestling star worldwide and the most popular wrestler of the 1 ...
, American professional wrestler
*
Herbert Huncke, American Writer
{{disambiguation