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Index may refer to:



United States

Publishing and library studies[edit]


  • Index (statistics), a type of aggregate measure
    • Scale, a method of reporting data in social sciences sometimes called an index
  • Diversity index, a measure of distribution or variety in fields such as ecology or information science
  • Indexicality, in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs

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


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



  • The winding number of an oriented closed curve on a surface relative to a point on that surface
  • The index of a vector field, an integer that helps to describe the behaviour of a vector field around an isolated zero


  • 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]

See also[edit]