Ha

Ha may refer to:

Agencies and organizations

Arts, entertainment, and media

Language

Places

Science and technology

Chemistry

Medicine

Units of measure

Other uses in science and technology

  • 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

Transportation

Other uses

See also

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