H (disambiguation)

H is the eighth letter of the Latin alphabet.

H may also refer to:

Musical symbols

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, absolute magnitude
H (as in ΔH), magnitude of enthalpy
H, chemical symbol for the element hydrogen
h, convective heat transfer coefficient
H, the symbol for the Henry (unit), the SI derived unit of inductance
h, hour
The Heaviside step function, usually denoted by H
H⁰, the symbol of the Higgs boson
H, Hubble constant
h, dimensionless Hubble parameter
h, impulse response in LTI system theory
H, magnetic field intensity
h, Planck constant
- ℏ ("h-bar"), the reduced Planck constant, ℏ=h/2π ;
H, system function, system response, or transfer function in LTI system theory
H, the upper half-plane of the complex numbers
h-index, an author-level metric of the productivity and citation impact of the publications of a scientist or scholar

H or h, suffixed to denote hexadecimal in Intel-derived assembly languages: FFh or 05A3H. Some implementations require a leading zero when the first hexadecimal digit character is not a decimal digit: 0FFh
.h, the filename extension for the C include directive called header
Haplogroup H (disambiguation)
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, statistical test used in DNA analysis
Hecto-, the SI prefix for hundred or 10²
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
H, Hitachi, Ltd. mobile phone
H, sexual content or activity, associated with Japanese "Hentai"
H, Hurricane tie for construction
h, voiceless glottal fricative phone
Conservative Party of Norway (Høyre)
The military designation for helicopters, such as the UH-60 Blackhawk and AH-64 Apache
The high-prestige register in a diglossia
Revista H
H (magazine)
H, a symbol for a heliport
H, the international license plate code of Hungary
H, code for a formulation of sulfur mustard
Hit (baseball)
Farmall H, a tractor produced by International Harvester from 1939–1953