H is the eighth letter of the Latin alphabet. H may also refer to:

Musical symbols

* H number, Harry Halbreich reference mechanism for music by Honegger and Martinů * H, B (musical note) * H,

B major B major (or the key of B) is a major scale based on B. The pitches B, C, D, E, F, G, and A are all part of the B major scale. Its key signature has five sharps. Its relative minor is G-sharp minor, its parallel minor is B minor, and its ...

People

* H. (noble) (died after 1279), an unidentified nobleman in the Kingdom of Hungary who served as master of the horse * H. (1900–1995), British activist and economist Edgar Hardcastle * H (born 1957), British guitarist Adrian Smith * H (born 1976), British singer Ian Watkins (Steps) * h (born 1959), British vocalist Steve Hogarth * H (born 1981/82), one of the attackers in the Sydney gang rapes * H. (born 1925), girl who gave birth to a child when she was six years old * H Waldman (born 1972), American-Israeli basketball player

Science and mathematics

* h,

hour An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as of a day and scientifically reckoned between 3,599 and 3,601 seconds, depending on the speed of Earth's rotation. There are 60 minutes in an hour, and 24 ho ...

* h, hecto-, the SI prefix for hundred or 10²

Biology

* Haplogroup H ** Haplogroup H (mtDNA), human mitochondrial DNA ** Haplogroup H (Y-DNA), human Y-chromosome DNA *

ATC code H See also *Sex hormones are in the ATC group G03. * Insulins are in the ATC group A10A. References {{Calcium homeostasis H ...

''Systemic hormonal preparations, excluding sex hormones and insulins'', a section of the Anatomical Therapeutic Chemical Classification System *

Fay and Wu's H Fay and Wu's H is a statistical test created by and named after two researchers Justin Fay and Chung-I Wu. The purpose of the test is to distinguish between a DNA sequence evolving randomly ("neutrally") and one evolving under positive selection. Th ...

, a statistical test used in DNA analysis

Chemistry

* Hydrogen, symbol H, a chemical element * H, code for a formulation of

sulfur mustard Mustard gas or sulfur mustard is a chemical compound belonging to a family of cytotoxic and blister agents known as mustard agents. The name ''mustard gas'' is technically incorrect: the substance, when dispersed, is often not actually a gas, b ...

Computer science

* Language H, procedural programming language * or , suffixed to denote

hexadecimal In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of 16. Unlike the decimal system representing numbers using 10 symbols, hexa ...

in Intel-derived assembly languages * .h, the filename extension for the C include directive called header

Linguistics

* , the

International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic transcription, phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standa ...

symbol for a voiceless glottal fricative sound * H or high, the high-prestige register in a diglossia

Mathematics

* H, the upper half-plane of the complex numbers * , the Heaviside step function * h, impulse response in LTI system theory * H, system function, system response, or transfer function in LTI system theory

Physics and cosmology

Constants

* h, Planck constant * H, Hubble constant * h, dimensionless Hubble constant

Measures

* H, absolute magnitude in the context of the Solar system * H (as in ), magnitude of enthalpy * h, convective heat transfer coefficient * H,

magnetic field A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to ...

intensity

Other uses in physics

* H, symbol for the Henry (unit), the SI derived unit of inductance * H⁰, the symbol of the

Higgs boson The Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory. In the Stand ...

Planets

* H, distortion of symbol for Uranus * h, distortion of symbol for

Saturn Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It has only one-eighth the average density of Earth; h ...

Other uses in science

* h-index, an author-level metric of the productivity and citation impact of the publications of a scientist or scholar

Arts and media

Film and TV

* ''H'' (1990 film), a 1990 Canadian film * ''H'' (2002 film), a 2002 Korean film * ''H.'' (2014 film), a 2014 American film by Rania Attieh and Daniel Garcia * ''H'' (TV series), a 1998-2002 French TV series * H, the production code for the 1964 ''Doctor Who'' serial ''

The Reign of Terror The Reign of Terror (french: link=no, la Terreur) was a period of the French Revolution when, following the creation of the First Republic, a series of massacres and numerous public executions took place in response to revolutionary fervour ...

'' * H, a codename used to refer to an anonymous individual in the police procedural drama ''

Line of Duty ''Line of Duty'' is a British police procedural television series created by Jed Mercurio and produced by World Productions. On 26 June 2012, BBC Two began to broadcast the first series; it was its best-performing drama series in ten years wit ...

'' * "H", the fifth episode of the sixth series of '' Taskmaster'' that aired in 2018

Music

*''h'', a 1990 compilation album by Hitomi (singer) *''H'', a 1980 album by Bob James (musician) * ''H'' (Ayumi Hamasaki EP), 2002 * ''H'' (Lee Hae-ri EP), 2017 * "H." (song), a song by Tool on their 1996 ''Ænima'' album

Other media

* ''H'' (magazine) * Revista H, a monthly Mexican men's magazine * '' "H" Is for Homicide'', the eighth novel in Sue Grafton's "Alphabet mystery" series, published in 1991

Other uses

Heroin Heroin, also known as diacetylmorphine and diamorphine among other names, is a potent opioid mainly used as a recreational drug for its euphoric effects. Medical grade diamorphine is used as a pure hydrochloride salt. Various white and brow ...

* Н, a letter of the Cyrillic alphabet analogous to N * Һ, letter

Shha Shha or He (Һ һ; italics: ) is a letter of the Cyrillic script. Its form is derived from the Latin letter H (H h ), but the capital forms are more similar to a rotated Cyrillic letter Che (Ч ч) or a stroke-less Tshe (Ћ ћ) be ...

of the Cyrillic alphabet * Trains: **

H (S-train) H is an S-train service in Metropolitan Copenhagen, Denmark that serves mainly the outer part of Frederikssundbanen, running partially non-stop between Ballerup and Flintholm. It is one of the six base lines of the S-train network, running ev ...

, a train service in Metropolitan Copenhagen ** H, Rockaway Park Shuttle subway service in New York ** Line H of the Buenos Aires Subte * H, a Hitachi, Ltd. mobile phone * H, sexual content or activity, associated with Japanese "Hentai" * Hurricane tie, used in construction * Conservative Party of Norway (''Høyre'') * The military designation for helicopters, such as the UH-60 Blackhawk and AH-64 Apache * H, a symbol for a heliport * H, the international license plate code of Hungary *

Hit (baseball) In baseball statistics, a hit (denoted by H), also called a base hit, is credited to a batter when the batter safely reaches or passes first base after hitting the ball into fair territory with neither the benefit of an error nor a fielder's ...

* Farmall H, a tractor produced by International Harvester from 1939 to 1953 * Hotel, the military time zone code for UTC+08:00