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
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
- h, 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
Physics and cosmology
Constants
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
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
- 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
, 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
See also
- Aitch (disambiguation)
- H class (disambiguation)
- H band (disambiguation)
- ^H, characters representing the backspace control code
- հ, an Armenian letter
- ㅐ, a Korean letter
- Ħ (H with stroke), a Maltese letter
- Н, a Cyrillic capital letter "En"
- Η, Greek capital letter eta
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