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Ha

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Ha may refer to:

Agencies and organizations

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Arts, entertainment, and media

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Language

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Places

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Science and technology

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Chemistry

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Medicine

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Units of measure

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Other uses in science and technology

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  • ha (function prefix) (half), a prefix for some trigonometric functions in mathematics
  • 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
  • Ha, or alternative hypothesis, in statistical testing
  • H-alpha (Hα), a deep-red visible spectral line of the hydrogen atom

Surnames

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Transportation

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Other uses

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See also

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