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 Halbreich (2007).Patrick Szersnovicz. Harry Halbreich (obituary). '' Diapason'', September 2016, No.64 ...

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 re ...

* H, B major

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 Worl ...

* 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 ( ...

* 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 * 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 Euro ...

, 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 ''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 ...

, symbol H, a chemical element * H, code for a formulation of sulfur mustard

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 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 notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standardized representation ...

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'', b ...

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 ...

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 argum ...

* 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 o ...

* H, system function, system response, or transfer function in

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 astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it ...

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 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 combined processes o ...

coefficient * H, magnetic field 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

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 ( Caelus), who, according to Greek mythology, was the great-grandfather of Ares (Mars), grandfather of Zeus (Jupiter) and father of ...

* h, distortion of symbol for Saturn

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 ...

, 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'' * "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 fro ...

* ''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 * 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 subway service in New York ** Line H 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. It is the opposite of a strut or column, which is designed to resist compression. Ties may be m ...

, 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 o ...

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

Musical symbols

People

Science and mathematics

Biology

Chemistry

Computer science

Linguistics

Mathematics

Physics and cosmology

Constants

Measures

Other uses in physics

Planets

Other uses in science

Arts and media

Film and TV

Music

Other media

Other uses

See also