H (disambiguation)

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

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 Waldman (born 1972), American-Israeli basketball player

Science and mathematics

 * h, hour
 * 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 Systemic hormonal preparations, excluding sex hormones and insulins, a section of the Anatomical Therapeutic Chemical Classification System
 * Fay and Wu's H, a statistical test used in DNA analysis

Chemistry

 * Hydrogen, symbol H, a chemical element
 * H, code for a formulation of sulfur mustard
 * H (or His), an abbreviation for the amino acid histidine

Computer science

 * Language H, procedural programming language
 * H or h, suffixed to denote hexadecimal in Intel-derived assembly languages
 * .h, the filename extension for the C include directive called header

Linguistics

 * , the International Phonetic Alphabet 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
 * $H$, the Heaviside step function
 * h, impulse response in LTI system theory
 * H, system function, system response, or transfer function in LTI system theory

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 $ΔH$), magnitude of enthalpy
 * h, convective heat transfer coefficient
 * H, magnetic field intensity

Other uses in physics

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

Planets

 * H, distortion of symbol [[Image:Uranus monogram.svg|22px]] for Uranus
 * h, distortion of symbol [[Image:Saturn symbol.svg|22px]] for Saturn

Other uses in science

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

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
 * The H logo used for Globo’s midday news program Jornal Hoje

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
 * Н, a letter of the Cyrillic alphabet analogous to N
 * Һ, letter Shha of the Cyrillic alphabet
 * Trains:
 * H (S-train), a train service in Metropolitan Copenhagen
 * H, Rockaway Park Shuttle subway service in New York
 * Line H of the Buenos Aires Subte
 * Tokyo Metro Hibiya Line, a subway service operated by the Tokyo Metro, labeled Logo of Tokyo Metro Hibiya Line.svg
 * JRW kinki-H.svg, the official West Japan Railway Company service symbol for the JR Tōzai Line and Katamachi Line
 * 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)
 * Farmall H, a tractor produced by International Harvester from 1939 to 1953
 * Hotel, the military time zone code for UTC+08:00
 * H, a harder grade of pencil lead