H1

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

Science

• H1 (particle detector)
• Histamine H1 receptor
• Histone H1, a protein
• British NVC community H1, a heath zone
• Hydrogen atom (H₁)
• H I region, a cloud in the interstellar medium
• ATC code H01 Pituitary and hypothalamic hormones and analogues, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Statistical category of eyelid inflammations, in ICD-10 Chapter VII: Diseases of the eye, adnexa
• Haplogroup H1 (disambiguation), a grouping in genetics based on certain similarities
• Alternative hypothesis (H₁)

Technology

• <h1></h1>, level 1 heading markup for HTML Web pages; see HTML element
• DSC-H1, a camera
• H1, John Harrison's first marine chronometer

Transportation

• Interstate H-1, a highway in Hawaii

Aviation

• Bell Huey family Bell H-1, two helicopters with that designation
• Hooters Air airline
• Hughes H-1 Racer, a racing aircraft

Motor vehicles

• Haval H1, a Chinese subcompact crossover
• Hummer H1, an American full-size SUV
• Hyundai H-1, a Korean commercial van

Motorcycles

• Kawasaki H1 Mach III, road motorcycle
• Kawasaki H1R, 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, locomotive
• LNER Class H1, locomotive
• Designation for METRORail Siemens S70 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, one of the three laryngeals in the reconstructed Proto-Indo-European language
• H1 Unlimited, a premier unlimited hydroplane racing league
• H1 Lamp, an automotive halogen light bulb
• H-I or H–1, a Japanese rocket
• Rocketdyne H-1, a thrust liquid-propellant rocket engine
• H-1NF, the Australian Plasma Fusion Research Facility, formerly H-1 Heliac stellarator
• Hora Um da Notícia, a news program aired by Rede Globo
• Area H1, the area of Hebron controlled by the Palestinian Authority under the Hebron Protocol

See also

• Hello Internet (HI), a podcast
• H-1B visa
• HI (disambiguation)