HH may refer to:
Organizations
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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
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Hartmann House Preparatory School, an independent preparatory school in Harare, Zimbabwe
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Heirs Holdings, a Nigerian conglomerate with diversified interests
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Helly Hansen, a Norwegian brand specializing in clothing and gear for oceans and mountains
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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 ...
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hh blood group, a rare blood type
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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
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Herbig–Haro object, in astronomy
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Hitchhiker Program, a NASA program established in 1984
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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
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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)
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Hereditary haemochromatosis
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