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 National Highways, formerly the Highways Agency and later Highways England, is a government-owned company charged with operating, maintaining and improving motorways and major A roads in England. It also sets highways standards used by all fo ...

(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 Homosexuals Anonymous (HA) is an ex-gay group which practices conversion therapy and describes itself as "a fellowship of men and women, who through their common emotional experience, have chosen to help each other live in freedom from homosexualit ...

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 ''Human Action: A Treatise on Economics'' is a work by the Austrian economist and philosopher Ludwig von Mises. Widely considered Mises' ''magnum opus'', it presents the case for laissez-faire capitalism based on praxeology, his method to under ...

'', a book by the Austrian economist Ludwig von Mises *

The Jim Henson Company The Jim Henson Company (formerly known as Muppets, Inc., Henson Associates, Inc., and Jim Henson Productions, Inc.; commonly referred to as Henson) is an American entertainment company located in Los Angeles, California. The company is known for ...

, 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) Ha (hiragana: は, katakana: ハ) is one of the Japanese kana, each of which represent one mora. Both represent . They are also used as a grammatical particle (in such cases, they denote , including in the greeting "kon'nichiwa") and serve as t ...

, in syllabic Japanese script *ه ( hāʾ), ح (

ḥāʾ Heth, sometimes written Chet, but more accurately Ḥet, is the eighth letter of the Semitic abjads, including Phoenician Ḥēt 𐤇 , Hebrew Ḥēth , Aramaic Ḥēth , Syriac Ḥēṯ ܚ, Arabic Ḥā' , and Maltese Ħ, ħ. Heth originall ...

), 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 Ha, also known with the Bantu language prefix as ''Giha, Igiha,'' or ''Kiha,'' is a Bantu language spoken by the Ha people of the Kigoma Region of Tanzania, spoken on the eastern side of Lake Tanganyika up to the headwaters of the Mikonga. It is ...

, 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 Haa, Ha, or Has is a Thromde or town, and the seat of Haa District in Bhutan. Haa is situated in Haa Valley in the west of the Bhutan bordering Sikkim with ethnic Tibetian and Han majority. The major economic activity is rice production, yak herd ...

Hå Hå is a municipality in Rogaland county, Norway. It is the southernmost municipality in the traditional district of Jæren. The administrative centre of the municipality is the village of Varhaug. Other villages in Hå include Brusand, Hæen, ...

, Norway *

Ha Gorge Ha Gorge ( el, Φαράγγι Χά) is a narrow gorge, at the Monasteraki Dakos, on the eastern part of the island of Crete in Greece. It is located in the west slope of Thrypti mountain range, and exits east of Vasiliki village in the plain of ...

, Greece *

HA postcode area The HA postcode area, also known as the Harrow postcode area, is a group of ten postcode districts in England, within seven post towns. These cover part of northwest London, plus a very small part of south Hertfordshire. The main sorting office ...

, 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 Hydroxyapatite, also called hydroxylapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH), but it is usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two entities. ...

, 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 Hypochondriasis or hypochondria is a condition in which a person is excessively and unduly worried about having a serious illness. An old concept, the meaning of hypochondria has repeatedly changed. It has been claimed that this debilitating cond ...

(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 High availability (HA) is a characteristic of a system which aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. Modernization has resulted in an increased reliance on these systems. Fo ...

, 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 The ''Hundred Family Surnames'' (), commonly known as ''Bai Jia Xing'', also translated as ''Hundreds of Chinese Surnames'', is a classic Chinese text composed of common Chinese surnames. An unknown author compiled the book during the Song dyn ...

'' *

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) Xia is the Mandarin pinyin romanization of the Chinese surname written in Chinese character. It is romanized Hsia in Wade–Giles, and Ha in Cantonese. Xia is the 154th surname in the Song dynasty classic text ''Hundred Family Surnames''. As of 2 ...

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

Transportation

British Rail Class 71 The British Rail Class 71 was an electric locomotive used on the Southern Region of British Railways. Unlike Southern Region electro-diesel locomotives (such as classes 73 and 74) they could not operate away from the electrified (750 V DC) sy ...

, a locomotive (classified type HA under the Southern Region's pre-TOPS scheme) *

Hawaiian Airlines Hawaiian Airlines ( haw, Hui Mokulele o Hawaiʻi ) is the largest operator of commercial flights to and from the U.S. state of Hawaii. It is the tenth-largest commercial airline in the United States, and is based at Honolulu, Hawaii. The airl ...

(IATA designator HA) *

(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 Heng and Ha () are two generals of the Shang dynasty in Chinese mythology, featured within the 16th-century Chinese fantasy novel ''Investiture of the Gods''. These two fictional characters were created by the author of ''Investiture of the Gods' ...

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