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


Musical symbols

* H number,
Harry Halbreich Harry Halbreich (Berlin, 9 February 1931 – Brussels, 27 June 2016) was a Belgian musicologist.Dust jacket biography of Harry Halbreich from #Halbreich2007, Halbreich (2007).Patrick Szersnovicz. Harry Halbreich (obituary). ''Diapason (magazine), ...
reference mechanism for music by Honegger and Martinů * H,
B (musical note) B, also known as Si, Ti, or, in some European countries, H, is the seventh note and the twelfth semitone of the fixed-Do solfège. Its enharmonic equivalents are C (C-flat) and A (A-double sharp). When calculated in equal temperament with a ref ...
* 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) H. (died after 1279) was an unidentified nobleman in the Kingdom of Hungary, who served as master of the horse ( hu, lovászmester) in 1279. Besides that he was also ispán (''comes'') of Moson County Moson ( German: Wieselburg, Slovak: Mošon ...
(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 Edgar Richard "Hardy" Hardcastle (1899 – June 1995) was a theoretician of Marxist economics. The son of a founder member of the Socialist Party of Great Britain, Hardcastle went to prison as a socialist conscientious objector in the First World ...
* H (born 1957), British guitarist
Adrian Smith Adrian Frederick "H" Smith (born 27 February 1957) is an English guitarist best known as a member of heavy metal band Iron Maiden, for whom he also writes songs and performs backing vocals both live and in the studio. Smith grew up in London ...
* H (born 1976), British singer
Ian Watkins (Steps) Ian Watkins may refer to: * Ian Watkins (Lostprophets singer) (born 1977), convicted sex offender and former lead singer of Welsh rock band Lostprophets * Ian Watkins (rugby union) (born 1963), Wales international rugby player * Ian "H" Watkins (b ...
* h (born 1959), British vocalist
Steve Hogarth Steve Hogarth (born Ronald Stephen Hoggarth, 14 May 1956 in Kendal, Westmorland) also known as "h", is an English singer-songwriter and multi-instrumentalist. Since 1989 he has been the lead singer of the British rock band Marillion, for which ...
* H (born 1981/82), one of the attackers in the
Sydney gang rapes The Sydney gang rapes were a series of gang rape attacks committed by a group of up to 14 youths led by Bilal Skaf against Australian women and teenage girls (2 with Italian parents, 1 with Greek parents and one part Aboriginal girl), as young as ...
* H. (born 1925), girl who gave birth to a child when she was six years old *
H Waldman H Waldman ('ולדמן אייץ; nickname: H; born January 21, 1972) is an American-Israeli former basketball player. He played the point guard and shooting guard positions. Waldman played in the Israel Basketball Premier League from 1996 to 2001. ...
(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- ''Hecto'' (symbol: h) is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek , meaning "hundred". In 19th century English it was sometimes spelled "hecato", ...
, the SI prefix for hundred or 102


Biology

* Haplogroup H **
Haplogroup H (mtDNA) Haplogroup H is a human mitochondrial DNA (mtDNA) haplogroup. The clade is believed to have originated in Southwest Asia, near present day Syria, around 20,000 to 25,000 years ago. Mitochondrial haplogroup H is today predominantly found in Europ ...
, human mitochondrial DNA **
Haplogroup H (Y-DNA) Haplogroup H (Y-DNA), also known as H-L901/M2939 is a Y-chromosome haplogroup. The primary branch H1 (H-M69) and its subclades is one of the most predominant haplogroups amongst populations in South Asia, particularly its descendant H1a1  ...
, 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. T ...
, a statistical test used in DNA analysis


Chemistry

*
Hydrogen Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula . It is colorless, odorless, tasteless, non-toxic, an ...
, 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 Language H is a proprietary, procedural programming language created by NCR based on COBOL COBOL (; an acronym for "common business-oriented language") is a compiled English-like computer programming language designed for business use. It is ...
, 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 Many programming languages and other computer files have a directive, often called include (sometimes copy or import), that causes the contents of the specified file to be inserted into the original file. These included files are called copybooks ...
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 The voiceless glottal fricative, sometimes called voiceless glottal transition, and sometimes called the aspirate, is a type of sound used in some spoken languages that patterns like a fricative or approximant consonant ''phonologically'', but ...
sound * H or high, the high-prestige register in a
diglossia In linguistics, diglossia () is a situation in which two dialects or languages are used (in fairly strict compartmentalization) by a single language community. In addition to the community's everyday or vernacular language variety (labeled " ...


Mathematics

* H, the
upper half-plane In mathematics, the upper half-plane, \,\mathcal\,, is the set of points in the Cartesian plane with > 0. Complex plane Mathematicians sometimes identify the Cartesian plane with the complex plane, and then the upper half-plane corresponds to t ...
of the complex numbers * , the
Heaviside step function The Heaviside step function, or the unit step function, usually denoted by or (but sometimes , or ), is a step function, named after Oliver Heaviside (1850–1925), the value of which is zero for negative arguments and one for positive argume ...
* h, impulse response in
LTI system theory LTI can refer to: * ''LTI – Lingua Tertii Imperii'', a book by Victor Klemperer * Language Technologies Institute, a division of Carnegie Mellon University * Linear time-invariant system, an engineering theory that investigates the response of ...
* H, system function, system response, or transfer function in
LTI system theory LTI can refer to: * ''LTI – Lingua Tertii Imperii'', a book by Victor Klemperer * Language Technologies Institute, a division of Carnegie Mellon University * Linear time-invariant system, an engineering theory that investigates the response of ...


Physics and cosmology


Constants

* h,
Planck constant The Planck constant, or Planck's constant, is a fundamental physical constant of foundational importance in quantum mechanics. The constant gives the relationship between the energy of a photon and its frequency, and by the mass-energy equivale ...
* H,
Hubble constant Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving ...
* h,
dimensionless Hubble constant Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving ...


Measures

* H,
absolute magnitude Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse Logarithmic scale, logarithmic Magnitude (astronomy), astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent mag ...
in the context of the Solar system * H (as in ), magnitude of
enthalpy Enthalpy , a property of a thermodynamic system, is the sum of the system's internal energy and the product of its pressure and volume. It is a state function used in many measurements in chemical, biological, and physical systems at a constant ...
* h,
convective heat transfer Convection (or convective heat transfer) is the heat transfer, transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combin ...
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 henry (symbol: H) is the unit of electrical inductance in the International System of Units (SI). If a current of 1 ampere flowing through a coil produces flux linkage of 1 weber turn, that coil has a self inductance of 1 henry.‌ The 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 Uranus is the seventh planet from the Sun. Its name is a reference to the Greek god of the sky, Uranus (mythology), Uranus (Caelus), who, according to Greek mythology, was the great-grandfather of Ares (Mars (mythology), Mars), grandfather ...
* 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 The ''h''-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The ''h''-index correlates with obvious success indicators such as winn ...
, 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'' * 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) , known professionally as , is a Japanese singer-songwriter. She began her career as teen model before making her singing debuting under the helm of Tetsuya Komuro in 1994, who produced Hitomi's earliest work in pop music. Hitomi has striven for ...
*''H'', a 1980 album by
Bob James (musician) Robert McElhiney James (born December 25, 1939) is an American jazz keyboardist, arranger, and record producer. He founded the band Fourplay and wrote "Angela", the theme song for the TV show ''Taxi.'' According to VICE (magazine), music from ...
* ''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 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 ...
, a train service in Metropolitan Copenhagen ** H,
Rockaway Park Shuttle The Rockaway Park Shuttle is a New York City Subway shuttle train that operates in Queens. It connects with the train at Broad Channel station and is the latest iteration of the Rockaway Shuttle services that have been running on the Rockaway ...
subway service in New York **
Line H Line H is a line of the Buenos Aires Underground. The first phase, between Plaza Once and Caseros, which opened on 18 October 2007, currently stretches over 8.8 km between Hospitales and Facultad de Derecho stations. It is the first entirely ...
of the Buenos Aires Subte * H, a
Hitachi, Ltd. () is a Japanese multinational conglomerate corporation headquartered in Chiyoda, Tokyo, Japan. It is the parent company of the Hitachi Group (''Hitachi Gurūpu'') and had formed part of the Nissan ''zaibatsu'' and later DKB Group and Fuyo ...
mobile phone * H, sexual content or activity, associated with Japanese "Hentai" *
Hurricane tie A tie, strap, tie rod, eyebar, guy-wire, suspension cables, or wire ropes, are examples of linear structural components designed to resist Tension (physics), tension. It is the opposite of a strut or column, which is designed to resist compressio ...
, used in construction *
Conservative Party of Norway The Conservative Party or The Right ( nb, Høyre, nn, Høgre, , H; se, Olgešbellodat) is a liberal-conservative political party in Norway. It is the major party of the Norwegian centre-right, and was the leading party in government as part of ...
(''Høyre'') * The military designation for
helicopters A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...
, such as the UH-60 Blackhawk and AH-64 Apache * H, a symbol for a
heliport A heliport is a small airport suitable for use by helicopters and some other vertical lift aircraft. Designated heliports typically contain one or more touchdown and liftoff areas and may also have limited facilities such as fuel or hangars. I ...
* H, the
international license plate code The country in which a motor vehicle's vehicle registration plate was issued may be indicated by an international licence plate country code, formerly known as an International Registration Letter or International Circulation Mark. It is ref ...
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 The Farmall H is a medium-sized two-plow row crop tractor produced by International Harvester under the Farmall brand from 1939 to 1954. It was the most widely produced of International Harvester's " letter series", with approximately 390,000 pro ...
, a tractor produced by International Harvester from 1939 to 1953 * Hotel, the military time zone code for UTC+08:00


See also

*
Aitch (disambiguation) Aitch may refer to: *Aitch, a phonetic representation of the letter H *Aitch (artist), a Romanian List of female comics creators, comics creator *Aitch (rapper) (born 1999), British rapper *Aitch (surname) *Aitch, Pennsylvania, an extinct town in ...
* H class (disambiguation) *
H band (disambiguation) H band may refer to: * H band (infrared), an atmospheric transmission window centred on 1.65 μm * H band (NATO), a radio frequency band from 6 to 8 GHz * H band, part of the sarcomere A sarcomere (Greek σάρξ ''sarx'' "flesh", μέρος ''mer ...
* ^H, characters representing the backspace control code * հ, an Armenian letter * , a Korean letter * Ħ (H with stroke), a Maltese letter * Н, a Cyrillic capital letter "En" * Η, Greek capital letter eta {{disambiguation ca:H#Significats de H he:H#משמעויות נוספות של האות H la:H#Abbreviationes hu:H#Jelentései ja:H#Hの意味 nn:H#Bruk simple:H#Meanings for H fi:H#H-kirjaimen merkityksiä sv:H#Betydelser