HA, Ha, ha, and hA can refer to various things, depending on case.

The all-uppercase HA may refer to:

• the Highways Agency is an executive agency, part of the Department for Transport in the United Kingdom
• the Ha! comedy channel, one of the precursors to Comedy Central
• the British Rail pre-TOPS classification for twenty-four electric locomotives, later known as British Rail Class 71
• Haiti (FIPS 10-4 country code)
• Hawaiian Airlines (IATA airline designator)
• Hearst-Argyle, a media company in the United States
• Hells Angels, a motorcycle club
• hemagglutinin or hemagglutination assay, in virology
• high availability, as in a high-availability cluster
• home automation
• homeowners association
• Hong Kong Housing Authority
• Hospital Authority (Hong Kong)
• housing association
• HA postal area
• Hyaluronan
• Hydroxyapatite
• Head Automatica
• Headache
• Hydroulic Acid
• HA (video format)

Ha can mean:

• Ha (ethnic group), a people in Tanzania
• Hāʼ, a letter of Arabic alphabet (ﻩ)
• Kha, a letter of Cyrillic alphabet
• Ha (kana), romanisation of the Japanese kana は and ハ
• Ha, Bhutan
• Ha (mythology), a minor deity in Egyptian mythology
• the former symbol for chemical element 105, first called hahnium (Ha), later given the systematic name, unnilpentium, and now called dubnium (Db)
• the Hartmann number, in physics
• an interjection used to express joy, surprise, or laughter
• Ha (book), a book by Osamu Dazai
• a common prefix in Hebrew indicating the definite article.
• Hå, a municipality in Norway
• "Ha", the lead single from Juvenile's album 400 Degreez

ha can mean:

• hectare (ha), unit of surface area. 1 hectare = 10 000 m²
• the ISO 639 alpha-2 language code for the Hausa language

hA can mean:

• Hectoampere, an SI unit of electric current (worth 100 A)

See also

• Haha, disambiguation

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Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Ha". Image Credit.

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