Index

Look up index in Wiktionary, the free dictionary.

Index may refer to:

Business

• Index Corporation, a Japanese video game developer
• Index (retailer), a former UK catalogue retailer
• INDEX, a market research fair in Lucknow, India
• Index fund, a collective investment scheme
• Stock market index, a statistical average of prices of selected securities

Places

United States

• Index, Arkansas, an unincorporated community
• Index, Kentucky, an unincorporated community
• Index, Missouri, a ghost town
• Index, a hamlet in Otsego, New York
• Index, Virginia, an unincorporated community
• Index, Washington, a town
• Index, West Virginia, an unincorporated community

Publishing and library studies

• Bibliographic index, a regularly updated publication that lists articles, books, or other information items
• Citation index
• Index (publishing), an organized list of information in a publication
• Index (typography), a hand- or fist-shaped punctuation mark
• Index card, used for recording and storing small amounts of data
• The Index, Germany's List of Media Harmful to Young People published by the Bundesprüfstelle für jugendgefährdende Medien
• Index Librorum Prohibitorum, a list of publications which the Catholic Church censored
• Index, a character from the Japanese light novel, anime and manga A Certain Magical Index
• Index Magazine, a publication for art and culture
• Index on Censorship, a publishing organization that campaigns for freedom of expression, or its magazine of the same name
• index.hu, a Hungarian-language news and community portal
• Indexed, a Web cartoon by Jessica Hagy
• The Index (Kalamazoo College), a student newspaper
• The Index, an 1860s European propaganda journal created by Henry Hotze to support the Confederate States of America
• Thumb index, a round cut-out in the pages of a publication
• Truman State University Index, a student newspaper

Science

• 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

• Lookup table, a data structure used to store precomputed information
• Array index, an integer pointer into an array data structure
• A key in an associative array
• Database index, a data structure that improves the speed of data retrieval
• Index mapping of raw data for an array
• Index register, a processor register used for modifying operand addresses during the run of a program
• The dataset maintained by search engine indexing
• Indexed color, in computer imagery
• Indexed Sequential Access Method (ISAM), used for indexing data for fast retrieval
• Subject indexing, describing the content of a document by keywords
• Web indexing, Internet indexing
• Site map, or site index, a list of pages of a web site accessible to crawlers or users
• Webserver directory index, a default or index web page in a directory on a web server, such as index.html
• BitTorrent index, a list of .torrent files available for searches

Economics

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

Mathematics

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

Algebra

• The degree of an nth root
• Index of a subgroup, the number of a subgroup's left cosets
• The index of a linear map, the dimension of the map's kernel minus the dimension of its cokernel
• The index of a real quadratic form
• The index of a matrix

Analysis

• 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

Technology

• 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

• The Index (band)
• Index:, a Danish nonprofit organization which promotes Design for Life
• The Index, an item on a halo megastructure in the Halo series of video games
• The Index (Dubai), a skyscraper
• INDEX, earlier name for the Reimei satellite

See also

• Indexer (disambiguation)
• All pages with titles beginning with "Index"
• All pages with titles containing "Index"