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Index may refer to:

Arts, entertainment, and media[edit]

Fictitious entities[edit]

Periodicals and news portals[edit]

Other arts, entertainment and media[edit]

Business enterprises and events[edit]



Publishing and library studies[edit]

Science, technology, and mathematics[edit]

Computer science[edit]


  • Index (economics), a single number calculated from an array of prices and quantities
    • Price index, a typical price for some good or service

Mathematics and statistics[edit]

  • Index, a number or other symbol that indicates the location of a variable in an indexed family or set
  • i, the index of summation



  • Index, the winding number of an oriented closed curve on a surface relative to a point on that surface
  • Diversity index, a measure of distribution or variety in fields such as ecology or information science
  • Index of a vector field, an integer that helps to describe the behaviour of a vector field around an isolated zero
  • Indexicality, in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs


Other uses in science and technology[edit]

  • Indexing (motion), in mechanical engineering and machining, movement to a precisely known location
  • Refractive index, a measurement of how light propagates through a material

Other uses[edit]

  • INDEX, earlier name for the Reimei satellite
  • Index:, a Danish nonprofit organization which promotes Design for Life
  • The Index (Dubai), a skyscraper

See also[edit]