Ha may refer to:

Agencies and organizations

* Health authority * Hells Angels Motorcycle Club *

Highways Agency National Highways, formerly the Highways Agency and later Highways England, is a State-owned enterprise, government-owned company charged with operating, maintaining and improving Roads in England, motorways and major A roads in England. It al ...

(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 n ...

, 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), 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) (ꦲ), a letter in the Javanese script * Ha (kana), 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 origina ...

), 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 i ...

, 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 mem ...

, 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 her ...

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 ...

, 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 a ...

, a province of China (Guobiao abbreviation HA)

Science and technology

Chemistry

* Hahnium, 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, 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) (HA), an antigenic glycoprotein from Influenza viruses * Hemagglutination assay, 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 i ...

(ha), a unit of area * Hectoampere, a unit of electric current

Other uses in science and technology

* ha (function prefix) (half), a prefix for some trigonometric functions in mathematics *

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. F ...

, 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 dy ...

'' * Ha (Korean surname) ( 하, 河 or 夏) * Hà, Vietnamese surname * Hạ, Vietnamese surname * Xia (surname) ( 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) s ...

, 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 deser ...

* 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 U.S. Navy rank