H4

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H4, H04, or H-4 may refer to:

Science and mathematics

ATC code H04 Pancreatic hormones, a subgroup of the Anatomical Therapeutic Chemical Classification System
Histamine H₄ receptor, a human gene
Histone H4, a protein involved in the structure of chromatin in eukaryotic cells
Hydrogen-4 (H-4), an isotope of hydrogen
H4, a symmetry group in the fifth dimension; see H₄ polytope
H-4, a huge eruption of the Hekla volcano around 2310 BC

Technology

H-4 SOW, a precision-guided glide bomb used by the Pakistan Air Force
H4 (chronometer), an 18th-century marine chronometer designed by John Harrison
Zoom H4 Handy Recorder, a handheld digital audio recorder
<h4></h4>, level 4 heading markup for HTML Web pages, see HTML element#heading

Transport

Automobiles and roads

H4, a halogen headlamp bulb
H4, development name of the Hummer HX concept car
H-4, shorthand for a 4-cylinder horizontally-opposed or "flat four" engine
H4 Dansteed Way, a road in Milton Keynes, England

Aviation

GEN H-4, a Japanese helicopter design
Hughes H-4 Hercules (Spruce Goose), the largest flying boat ever built
Héli Sécurité Helicopter Airlines (IATA code), based in France; see List of airline codes (H)
Inter Islands Airlines (IATA code), a former airline based in Cape Verde

Ships and submarines

HMS H4, a 1915 British Royal Navy H-class submarine
HMS Tenedos (H04), a 1918 British Royal Navy Admiralty S-class destroyer
USS H-4 (SS-147), a 1918 United States Navy submarine

Rail

GNR Class H4, a class of British steam locomotives

Other uses

Halo 4, a video game created by 343 Industries for the Xbox 360
H4 (film), a 2013 film
H-4 visa, issued by the U.S. Citizenship and Immigration Services
British NVC community H4, a heath community in the British National Vegetation Classification system
H4 (classification), a cycling classification used in para-cycling