Ha

Ha may refer to:

Agencies and organizations

• Health authority
  • Johnstone v Bloomsbury HA
  • Bolitho v City and Hackney HA
  • Hotson v East Berkshire Area HA
• Hells Angels, a motorcycle gang
• Heritage Auction Galleries
• HockeyAllsvenskan, the second-tier league in ice hockey in Sweden
• Homelessness Australia, 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

Arts and entertainment

• Ha (Talvin Singh album), 2002
• Ha (Doseone album), 2005
• Ha! (Killing Joke album), 1982
• "Ha" (song), by Juvenile
• Ha! (TV channel), an American all-comedy TV channel
• The Jim Henson Company, formerly known as ha!

Language

• Hausa language, ISO 639-1 code HA
• Ha language, the language of the Ha people in eastern Africa
• Ha (kana), in syllabic Japanese script
• Arabic letters ه (hāʾ), ح (ḥāʾ), or خ (ḫāʾ)
• Ha (Javanese) (ꦲ), a letter in the Javanese script

People

• Ha people, a Tanzanian people

Places

• Ha, Bhutan
• HA postcode area, a group of English postal districts in north-west London
• Ha Gorge, Greece
• Hå, Norway
• Henan, a province of China (Guobiao abbreviation HA)

Science and technology

Chemistry

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

Medicine

• Hyperandrogenic anovulation, also called polycystic ovary syndrome
• Health anxiety (HA) or hypochondriasis (hypochondria)
• Hemagglutinin (influenza) (HA), an antigenic glycoprotein from Influenza viruses
• Hemagglutination assay, a measurement of viruses or bacteria

Other uses in science and technology

• ha (function prefix) (half), a prefix for some trigonometric functions in mathematics
• Hartree, an atomic unit of energy
• Hectare (ha), a unit of area
• Hectoampere, a unit of electric current
• High availability, systems design and implementation with a view to maximising service
• Hour angle, in astronomy, one of the coordinates of the equatorial coordinate system

Surnames

• Ha (Chinese surname) (哈), found in the Hundred Family Surnames
• Ha (Korean surname) (하)
• Hà, Vietnamese surname 河
• Hạ, Vietnamese surname 賀
• Hà, Ho, Vietnamese surname 胡
• Hạ, Vietnamese surname 夏

Transportation

• Hawaiian Airlines (IATA designator HA)
• Highways Agency, part of England's Department for Transport
• British Rail Class 71, a locomotive

Other uses

• Ha (mythology)
• Hospitalman Apprentice, a U.S. Navy rank
• Human Action, a book by Austrian economist Ludwig von Mises

See also

• Haha (disambiguation)
• Has (disambiguation)
• Haa (disambiguation)