Ha may refer to:

Agencies and organizations

Health authority Between 1996 and 2002 the English National Health Service was organised under the following health authorities. In 2002 the health authorities were reorganised and their boundaries changed to constitute 28 strategic health authorities, which were ...

Hells Angels Motorcycle Club The Hells Angels Motorcycle Club (HAMC) is a worldwide outlaw motorcycle club whose members typically ride Harley-Davidson motorcycles. In the United States and Canada, the Hells Angels are incorporated as the Hells Angels Motorcycle Corporatio ...

* Highways Agency (now ''National Highways''), UK government body maintaining England's major roads *

Homelessness Australia Homelessness Australia (HA) is the national peak body organisation for homelessness services and homeless people in Australia. The organisation provides systemic advocacy for the sector and works in collaboration with support services, state and na ...

, peak body organisation for homeless people and services * Homosexuals Anonymous an ex-gay program for dealing with unwanted same-sex attractions *

Hong Kong Housing Authority The Hong Kong Housing Authority (HA) is the main provider of public housing in Hong Kong. It was established in April 1973 under the Housing Ordinance and is an agency of the Government of Hong Kong. In the same year, the Resettlement Departm ...

Highways Agency, or (HA), former name of Highways England, part of England's Department for Transport

Arts, entertainment, and media

* ''Ha'' (Doseone album), 2005 * ''Ha'' (Talvin Singh album), 2002 * ''Ha!'' (Killing Joke album), 1982 * "Ha" (song), by Juvenile *

Ha! (TV channel) Ha!: TV Comedy Network (commonly known as Ha!) was a short-lived American pay television channel owned by Viacom; it was one of the first American all-comedy channels available in basic-tier television offers. Launched on April 1, 1990, at 7 p.m ...

, an American all-comedy TV channel * ''

Hamar Arbeiderblad ''Hamar Arbeiderblad'' (often referred to locally as "HA") is local newspaper published in Hamar, Norway by Hamar Media. The paper is edited by Carsten Bleness. HA was one of the first newspapers to place the internet edition of a newspaper behind ...

'', a Norwegian newspaper * '' Human Action'', a book by the Austrian economist Ludwig von Mises * The Jim Henson Company, formerly known as ha!

Language

Ha (Javanese) (ha), is a syllable in the Javanese script which represent the sound /ɦɔ/ or /ɦa/. The letter can also represent a null consonant, in which it would be pronounced as /ɔ/ or /a/. It is commonly transliterated to Latin as "ha" or "a" and somet ...

(ꦲ), a letter in the Javanese script * Ha (kana), in syllabic Japanese script *ه ( hāʾ), ح ( ḥāʾ), or خ (

ḫāʾ or or Xe (, transliterated as ( DIN-31635), (Hans Wehr), (ALA-LC) or (ISO 233)), is one of the six letters the Arabic alphabet added to the twenty-two inherited from the Phoenician alphabet (the others being , , , , ). It is based on the ' ...

), Arabic letters * Ha language, the language of the Ha people in eastern Africa *

Hausa language Hausa (; /; Ajami: ) is a Chadic language spoken by the Hausa people in the northern half of Nigeria, Ghana, Cameroon, Benin and Togo, and the southern half of Niger, Chad and Sudan, with significant minorities in Ivory Coast. Hausa is a member ...

, ISO 639-1 code HA

Places

* Ha, Bhutan * Hå, Norway * Ha Gorge, Greece * HA postcode area, a group of English postal districts in north-west London *

Henan Henan (; or ; ; alternatively Honan) is a landlocked province of China, in the central part of the country. Henan is often referred to as Zhongyuan or Zhongzhou (), which literally means "central plain" or "midland", although the name is al ...

, a province of China (Guobiao abbreviation HA)

Science and technology

Chemistry

Hahnium Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 16 hours. This greatly limits extended research on the element. ...

, an element now called Dubnium * Hyaluronan (Hyaluronic acid), a carbohydrate structure * Hydroxylapatite, a mineral

Medicine

Hyperandrogenic anovulation Polycystic ovary syndrome, or PCOS, is the most common endocrine disorder in women of reproductive age. The syndrome is named after the characteristic cysts which may form on the ovaries, though it is important to note that this is a sign and n ...

, also called polycystic ovary syndrome * Health anxiety (HA) or hypochondriasis (hypochondria) *

Hemagglutinin (influenza) Influenza hemagglutinin (HA) or haemagglutinin .html" ;"title="/sup>">/sup> (British English) is a homotrimeric glycoprotein found on the surface of influenza viruses and is integral to its infectivity. Hemagglutinin is a Class I Fusion Protei ...

(HA), an antigenic glycoprotein from Influenza viruses *

Hemagglutination assay The hemagglutination assay or haemagglutination assay (HA) and the hemagglutination inhibition assay (HI or HAI) were developed in 1941–42 by American virologist George Hirst as methods for quantifying the relative concentration of viruses, bact ...

, a measurement of viruses or bacteria

Units of measure

Hartree The hartree (symbol: ''E''h or Ha), also known as the Hartree energy, is the unit of energy in the Hartree atomic units system, named after the British physicist Douglas Hartree. Its CODATA recommended value is = The hartree energy is approxima ...

, an atomic unit of energy *

Hectare The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is a ...

(ha), a unit of area *

Hectoampere The ampere (, ; symbol: A), often shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One ampere is equal to ele ...

, a unit of electric current

Other uses in science and technology

ha (function prefix) The versine or versed sine is a trigonometric function found in some of the earliest (Sanskrit ''Aryabhatia'',High availability, systems design and implementation with a view to maximising service *

Hour angle In astronomy and celestial navigation, the hour angle is the angle between two planes: one containing Earth's axis and the zenith (the '' meridian plane''), and the other containing Earth's axis and a given point of interest (the ''hour circle'' ...

, in astronomy, one of the coordinates of the equatorial coordinate system * H_a, or

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 ...

, in statistical testing

Surnames

* Ha (Chinese surname) ( 哈), found in the '' Hundred Family Surnames'' *

Ha (Korean surname) Ha is a Latin alphabet rendition of the Korean family name "하", also often spelled Hah or less commonly as Har. As of the South Korean census of 2000, there were 213,758 people by this name in South Korea, or roughly 0.5% of the population. C ...

( 하, 河 or 夏) *

Hà Hà is a Vietnamese surname. The name is transliterated as He in Chinese and Ha in Korean. Ha is the anglicized variation of the surname Hà. It is also the anglicized variation of Hạ. Notable people with the surname Hà *Hà Kiều Anh, Mis ...

, Vietnamese surname *

Hạ Hạ is a Vietnamese surname. The name is transliterated as He (a transcription of 賀) or Xia (a transcription of 夏) in Chinese and Ha in Korean. Ha is the anglicized variation of the surname Hạ. It is also the anglicized variation of Hà ...

, Vietnamese surname * Xia (surname) ( 夏), romanized as Ha in Cantonese, Korean and Vietnamese pronunciation

Transportation

* British Rail Class 71, a locomotive (classified type HA under the Southern Region's pre-TOPS scheme) * Hawaiian Airlines (IATA designator HA) * Highways Agency (now ''National Highways''), UK government body maintaining England's major roads

Other uses

Ha (mythology) Ha ( egy, ḥꜣ), in ancient Egyptian religion, was a god of the '' Western Desert & the fertile oasis of Western Desert of Egypt''. He was associated with the Duat (the underworld) and pictured as a man wearing the hieroglyph symbol for des ...

* Ha, one of deities Heng and Ha *

Ha people __NOTOC__ The Ha, also called (''Waha'' in Swahili) or Abaha, are a Bantu ethnic group found in Kigoma Region in northwestern Tanzania bordering Lake Tanganyika.

, a Tanzanian people *

Hospitalman Apprentice A hospital corpsman (HM r corpsman is an enlisted medical specialist of the United States Navy, who may also serve in a U.S. Marine Corps unit. The corresponding rating within the United States Coast Guard is health services technician (HS) ...

, a U.S. Navy rank