H4

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

Biology and medicine

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

Technology

H-4 SOW, a precision-guided glide bomb used by the Pakistan Air Force
Halo 4, a video game created by 343 Industries for the Xbox 360
Harrison Number Four, 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 (not to be confused with an actual H 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
H4, IATA code for Héli Sécurité Helicopter Airlines, based in France
H4, IATA code for Inter Islands Airlines, 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

Trains

GNR Class H4, a 1920 British 2-6-0 steam locomotive model

Other uses

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
H-4, a huge eruption of the Hekla volcano around 2310 BC

See also

4H (disambiguation)

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