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'{{Self reference|For Wikipedia’s index, see [[Wikipedia:INDEX]].}} {{wiktionary|Index|index|indexes|indice|indices}} '''Index''' may refer to: {{tocright}} ==Arts, entertainment, and media== ===Fictional entities=== * [[Index (A Certain Magical Index)|Index (''A Certain Magical Index'')]], a character in the light novel series ''A Certain Magical Index'' * The Index, an item on a [[Halo (megastructure)|Halo megastructure]] in the ''Halo'' series of video games ===Periodicals and news portals=== * ''[[Index Magazine]]'', a publication for art and culture * [[Index.hr]], a Croatian online newspaper * [[index.hu]], a Hungarian-language news and community portal * [[The Index (Kalamazoo College)|''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 * ''[[Truman State University Index]]'', a student newspaper ===Other arts, entertainment and media=== * [[The Index (band)]] * ''Indexed'', a Web cartoon by [[Jessica Hagy]] * ''Index'', album by [[Ana Mena]] == Business enterprises and events == * [[Index (retailer)]], a former UK catalogue retailer * [[INDEX]], a market research fair in Lucknow, India * [[Index Corporation]], a Japanese video game developer ==Finance== * [[Index fund]], a collective investment scheme * [[Stock market index]], a statistical average of prices of selected securities ==Places in the United States== * [[Index, Arkansas]], an unincorporated community * [[Index, Kentucky]], an unincorporated community * [[Index, Missouri]], a ghost town * [[Index, New York]], a hamlet in Hartwick and 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]] * The ''Index'', colloquial name for ''Germany's List of Media Harmful to Young People'', published by the [[Bundesprüfstelle für jugendgefährdende Medien]] * [[Index card]], used for recording and storing small amounts of data * ''[[Index Librorum Prohibitorum]]'', a list of publications which the Catholic Church censored * [[Index on Censorship]], a publishing organization that campaigns for freedom of expression, or its magazine of the same name * [[Index (publishing)]], an organized list of information in a publication * [[Index (typography)]], a hand- or fist-shaped punctuation mark * [[Subject indexing]], describing the content of a document by keywords * [[Thumb index]], a round cut-out in the pages of a publication * [[Web indexing]], Internet indexing ==Science, technology, and mathematics== ===Computer science=== * Index, a key in an [[associative array]] * [[Index (typography)]], a character in Unicode, its code is 132 * Index, the dataset maintained by [[search engine indexing]] * [[Array index]], an integer pointer into an array data structure * [[BitTorrent index]], a list of .torrent files available for searches * [[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 * [[Indexed color]], in computer imagery * [[Indexed Sequential Access Method]] (ISAM), used for indexing data for fast retrieval * [[Lookup table]], a data structure used to store precomputed information * [[Site map]], or site index, a list of pages of a web site accessible to crawlers or users * [[Web indexing]], Internet indexing * [[Webserver directory index]], a default or index web page in a directory on a web server, such as index.html ===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 and statistics=== * Index, a number or other symbol that specifies an element of an [[indexed family]] or set * Index, an element of an [[index set]] * Index, the label of a summand in [[sigma notation|Σ-notation]] of a summation ==== Algebra ==== * [[Index of a subgroup]], the number of a subgroup's left cosets * Index, the degree of an [[nth root|''n''th root]] * Index of a [[linear map#Index|linear map]], the dimension of the map's kernel minus the dimension of its cokernel * Index of a [[Matrix (mathematics)|matrix]] * Index of a real [[quadratic form]] ==== Analysis ==== * 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 ==== Number theory ==== * Index, or the [[discrete logarithm]] of a number ====Statistics==== * [[Index (statistics)]], a type of aggregate measure ** [[Scale (social sciences)]], a method of reporting data in social sciences, sometimes called an index ===Other uses in science and technology=== * [[Dental indices]], standardized scoring systems for tooth problems * [[Indexicality]], in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs * [[Indexing (motion)]], in mechanical engineering and machining, movement to a precisely known location * [[Refractive index]], a measurement of how light propagates through a material * [[Valve Index]], a virtual reality headset ==Other uses== * ''INDEX'', earlier name for the [[Reimei]] satellite * [[Index:]], a Danish nonprofit organization which promotes Design for Life * [[The Index (Dubai)]], a skyscraper * [[Index (crater)]], a moon crater ==See also== * [[Indexer (disambiguation)]] * {{Look from}} * {{In title}} {{disambiguation|geo}}'