H1, H-1, H01, H I may refer to:

Places

Interstate H-1 Interstate H-1 (abbreviated H-1) is the longest and busiest Interstate Highway in the US state of Hawaii. The highway is located on the island of O‘ahu. Despite the number, this is an east–west highway; the 'H'-series (for Hawaii) numbering r ...

, a highway in Hawaii * Area H1, the area of Hebron controlled by the Palestinian Authority under the Hebron Protocol

Science

* H1 (particle detector) *

Histamine H1 receptor The H1 receptor is a histamine receptor belonging to the family of rhodopsin-like G-protein-coupled receptors. This receptor is activated by the biogenic amine histamine. It is expressed in smooth muscles, on vascular endothelial cells, in the h ...

Histone H1 Histone H1 is one of the five main histone protein families which are components of chromatin in eukaryotic cells. Though highly conserved, it is nevertheless the most variable histone in sequence across species. Structure Metazoan H1 prote ...

, a protein *

British NVC community H1 NVC community H1 (''Calluna vulgaris - Festuca ovina'' heath) is one of the Heaths in the British National Vegetation Classification system, heath Terminology used in connection with the British National Vegetation Classification, communities in th ...

, a heath zone *

Hydrogen atom A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen consti ...

(H₁) *

Protium (isotope) Hydrogen (1H) has three naturally occurring isotopes, sometimes denoted , , and . and are stable, while has a half-life of years. Heavier isotopes also exist, all of which are synthetic and have a half-life of less than one zeptosecond (10� ...

, an isotope of hydrogen *

H I region An HI region or H I region (read ''H one'') is a cloud in the interstellar medium composed of neutral atomic hydrogen (HI), in addition to the local abundance of helium and other elements. (H is the chemical symbol for hydrogen, and "I" is the Ro ...

, a cloud in the interstellar medium * ATC code H01 ''Pituitary and hypothalamic hormones and analogues'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Haplogroup H1 (disambiguation), a grouping in genetics based on certain similarities *

Alternative hypothesis In statistical hypothesis testing, the alternative hypothesis is one of the proposed proposition in the hypothesis test. In general the goal of hypothesis test is to demonstrate that in the given condition, there is sufficient evidence supporting ...

(H₁)

Technology

* , level 1 heading markup for HTML Web pages; see

HTML element An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 1993 ...

* DSC-H1, a Sony Cybershot digital camera * H1, John Harrison's first marine chronometer *

Tianwen-1 -1 (TW-1; zh, t=, s=, l='Heavenly Questions') is an interplanetary mission by the China National Space Administration (CNSA) which sent a robotic spacecraft to Mars, consisting of 6 spacecraft: an orbiter, two deployable cameras, lander, rem ...

(formerly ''Huoxing-1''), first Chinese space probe to reach Mars * H-1NF, the Australian Plasma Fusion Research Facility, formerly H-1 Heliac stellarator

Transportation

H1 Lamp The H1 is a halogen lamp designed for use in automotive headlamps and fog and driving lamps. It has also been widely applied in emergency vehicle lights. Origin The H1 was the first halogen lamp approved for automotive use. It was introduced in ...

, an automotive halogen light bulb * H-I or H–1, a Japanese rocket *

Rocketdyne H-1 The Rocketdyne H-1 was a thrust liquid-propellant rocket engine burning LOX and RP-1. The H-1 was developed for use in the S-I and S-IB first stages of the Saturn I and Saturn IB rockets, respectively, where it was used in clusters of eight e ...

, a liquid-propellant rocket engine

Aviation

Bell Huey family The Bell Huey family of helicopters includes a wide range of civil and military aircraft produced since 1956 by Bell Helicopter. This H-1 family of aircraft includes the utility UH-1 Iroquois and the derivative AH-1 Cobra attack helicopter series ...

Bell H-1, series of helicopters with that designation *

Hooters Air Hooters Air was an airline headquartered in Myrtle Beach, South Carolina, United States. Hooters Air flights were operated by Winston-Salem, North Carolina-based Pace Airlines both as ad hoc private charters, and as scheduled USDOT public charte ...

airline *

Hughes H-1 Racer The Hughes H-1 Racer is a racing aircraft built by Hughes Aircraft in 1935. It set a world airspeed record and a transcontinental speed record across the United States. The H-1 Racer was the last aircraft built by a private individual to set the ...

, a racing aircraft

Motor vehicles

Haval H1 The Haval H1 or formerly the Great Wall Haval M4 is a Subcompact crossover, subcompact Sport utility vehicle, SUV produced by the Chinese manufacturer Great Wall Motors, Great Wall. It was essentially a rebadged and lifted Great Wall Florid, until ...

, a Chinese subcompact crossover *

Hummer H1 The Hummer H1 is a four-wheel-drive utility vehicle based on the M998 Humvee, which was developed by AM General when it was a subsidiary of American Motors Corporation (AMC). Originally designed strictly for military use, the off-road vehicle was ...

, an American full-size SUV *

Hyundai H-1 Hyundai H-1 is a nameplate of a van and pickup truck used by Hyundai Motor Company in European export markets for three related models: * Hyundai Starex, (called i800 in Europe and H-200 in the Netherlands) a minibus/van A van is a type of ro ...

, a South Korean commercial van * Tiger H1, a German heavy tank used during WW2

Motorcycles

Kawasaki H1 Mach III The Kawasaki H1 Mach III was a two-stroke 500 cc sport bike made by Kawasaki from 1969 through to 1975. History By mid-1960s, the US had become the largest motorcycle market. American riders were demanding bikes with more horsepower and hig ...

, road motorcycle *

Kawasaki H1R The Kawasaki H1R was racing motorcycle manufactured by Kawasaki which competed in the 500 cc class of Grand Prix motorcycle racing. Based on the Kawasaki H1 street motorcycle, it was powered by a two stroke, three cylinder engine set across ...

, racing motorcycle

Ships

* HMS ''H1'', a 1915 British Royal Navy H-class submarine * HMS ''Hotspur'' (H01), a 1935 British Royal Navy H-class destroyer * USS ''H-1'', a 1913 United States Navy submarine

Rail

LB&SCR H1 class The London, Brighton and South Coast Railway (LB&SCR) H1 class was a class of 4-4-2 steam locomotives for express passenger work. They were designed by D. E. Marsh and were built by Messrs Kitson and Company in 1905 and 1906. History Prior t ...

, locomotive *

LNER Class H1 The North Eastern Railway Class D (later London and North Eastern Railway (LNER) Class H1) was a class of 4-4-4T three-cylinder side tank steam locomotive designed by Vincent Raven in 1913. They were used for rural passenger services. Forty ...

, locomotive *Designation for

METRORail METRORail is the light rail system in Houston, Texas (United States). In , the system had a ridership of , or about per weekday as of . METRORail ranks as the second most-traveled light rail system in the Southern United States and the 12th ...

Siemens S70 The Siemens S70, its successor the S700 and European variant, the Avanto, are a series of low-floor light-rail vehicles (LRV) and streetcars manufactured by Siemens Mobility, a division of German conglomerate Siemens AG. The S70 and S700 are ...

light rail vehicles

Time

*H1 may refer to the first half of the business year, while H2 refers to the second half.

Other uses

H1 (classification) H1 is a para-cycling classification. It includes people with a number of disability types including spinal cord injuries and cerebral palsy. Handcycles that can be used by people in races include the AP2 recumbent and AP3 recumbent. The classificat ...

, a para-cycling classification * , one of the three laryngeals in the reconstructed Proto-Indo-European language *

H1 Unlimited H1 Unlimited is an American Unlimited Hydroplane racing league that is sanctioned by the American Power Boat Association (APBA). Until 2009, the series was known as ABRA Unlimited Hydroplane, in turn renamed from APBA Unlimited Hydroplane in 2004. ...

, a premier unlimited hydroplane racing league *''

Hora Um da Notícia ''Hora Um da Notícia'', also known as simply ''Hora Um'', is an early morning two hour-long news program aired by the Brazilian television broadcaster Rede Globo, which debuted on December 1, 2014, replacing the daily edition of the ''Globo Rural ...

'', a news program aired by

Rede Globo TV Globo (, "Globe TV", or simply Globo), formerly known as Rede Globo, is a Brazilian free-to-air Television broadcasting, television network, launched by media proprietor Roberto Marinho on 26 April 1965. It is owned by media conglomerate Gr ...