Ha

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Ha may refer to:

Agencies and organizations[edit]

Arts and entertainment[edit]

Language[edit]

People[edit]

Places[edit]

Science and technology[edit]

Chemistry[edit]

Medicine[edit]

Other uses in science and technology[edit]

  • 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[edit]

Transportation[edit]

Other uses[edit]

See also[edit]