# Index > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Index > Markdown URL: https://mediated.wiki/source/Index.md > Source: https://en.wikipedia.org/wiki/Index > Source revision: 1354639352 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) For Wikipedia’s index, see [Wikipedia:Index](https://en.wikipedia.org/wiki/Wikipedia:Index). Look up ***[Index](https://en.wiktionary.org/wiki/Index)***, ***[index](https://en.wiktionary.org/wiki/index)***, ***[indexes](https://en.wiktionary.org/wiki/indexes)***, ***[indice](https://en.wiktionary.org/wiki/indice)***, or ***[indices](https://en.wiktionary.org/wiki/indices)*** in Wiktionary, the free dictionary. **Index** (pl.: **indexes** or **indices**) most commonly refers to: - [Index (publishing)](/source/Index_(publishing)), an organized list of information in a publication - [Web indexing](/source/Web_indexing), Internet indexing - An index, a key in an [associative array](/source/Associative_array) Index may also refer to: ## Arts, entertainment, and media ### Fictional entities - [Index (*A Certain Magical Index*)](/source/Index_(A_Certain_Magical_Index)), a character in the light novel series *A Certain Magical Index* - The Index, an item on the [Halo Array](/source/Halo_Array) in the *Halo* video game series ### Periodicals and news portals - *[Index Magazine](/source/Index_Magazine)*, a publication for art and culture - [Index.hr](/source/Index.hr), a Croatian online newspaper - [index.hu](/source/Index.hu), a Hungarian-language news and community portal - [*The Index* (Kalamazoo College)](/source/The_Index_(Kalamazoo_College)), a student newspaper - *The Index*, an 1860s European propaganda journal created by [Henry Hotze](/source/Henry_Hotze) to support the Confederate States of America - *[Truman State University Index](/source/Truman_State_University_Index)*, a student newspaper - *The Index: A Weekly Paper Devoted to Free Religion* (1870–1886), the semi-official periodical of the [Free Religious Association](/source/Free_Religious_Association) ### Other arts, entertainment and media - [The Index (band)](/source/The_Index_(band)) - *Indexed*, a Web cartoon by [Jessica Hagy](/source/Jessica_Hagy) - *Index*, album by [Ana Mena](/source/Ana_Mena) ## Business enterprises and events - [Index (retailer)](/source/Index_(retailer)), a former UK catalogue retailer - [INDEX](/source/INDEX), a market research fair in Lucknow, India - [Index Corporation](/source/Index_Corporation), a Japanese video game developer ## Finance - [Index fund](/source/Index_fund), a collective investment scheme - [Stock market index](/source/Stock_market_index), a statistical average of prices of selected securities ## Places in the United States - [Index, Arkansas](/source/Index%2C_Arkansas), an unincorporated community - [Index, Kentucky](/source/Index%2C_Kentucky), an unincorporated community - [Index, Missouri](/source/Index%2C_Missouri), a ghost town - [Index, New York](/source/Index%2C_New_York), a hamlet in Hartwick and Otsego, New York - [Index, Virginia](/source/Index%2C_Virginia), an unincorporated community - [Index, Washington](/source/Index%2C_Washington), a town - [Index, West Virginia](/source/Index%2C_West_Virginia), an unincorporated community ## Publishing and library studies - [Index (typography)](/source/Index_(typography)), a hand- or fist-shaped punctuation mark - [Bibliographic index](/source/Bibliographic_index), a regularly updated publication that lists articles, books, or other information items - [Citation index](/source/Citation_index) - The *Index*, colloquial name for the *[List of Media Harmful to Youth and Adolescents](/source/Federal_Agency_for_Child_and_Youth_Protection_in_the_Media#List_of_Media_Harmful_to_Youth_and_Adolescents)* (Germany) - [Index card](/source/Index_card), used for recording and storing small amounts of data - *[Index Librorum Prohibitorum](/source/Index_Librorum_Prohibitorum)*, a list of publications which the Catholic Church censored - [Index on Censorship](/source/Index_on_Censorship), a publishing organization that campaigns for freedom of expression, or its magazine of the same name - [Subject indexing](/source/Subject_indexing), describing the content of a document by keywords - [Thumb index](/source/Thumb_index), a round cut-out in the pages of a publication ## Science, technology, and mathematics ### Computer science - [Index (typography)](/source/Index_(typography)), a character in Unicode, its code is 132 - Index, the dataset maintained by [search engine indexing](/source/Search_engine_indexing) - [Array index](/source/Array_index), an integer pointer into an array data structure - [BitTorrent index](/source/BitTorrent_index), a list of .torrent files available for searches - [Database index](/source/Database_index), a data structure that improves the speed of data retrieval - [Index mapping](/source/Index_mapping) of raw data for an array - [Index register](/source/Index_register), a processor register used for modifying operand addresses during the run of a program - [Indexed color](/source/Indexed_color), in computer imagery - [Indexed Sequential Access Method](/source/Indexed_Sequential_Access_Method) (ISAM), used for indexing data for fast retrieval - [Lookup table](/source/Lookup_table), a data structure used to store precomputed information - [Site map](/source/Site_map), or site index, a list of pages of a web site accessible to crawlers or users - [Web server directory index](/source/Web_server_directory_index), a default or index web page in a directory on a web server, such as index.html ### Economics - [Index (economics)](/source/Index_(economics)), a single number calculated from an array of prices and quantities - [Price index](/source/Price_index), a typical price for some good or service ### Mathematics and statistics - Index, the position of an element in a [sequence](/source/Sequence) - Index, a number or other symbol that specifies an element of an [indexed family](/source/Indexed_family) or set - Index, an element of an [index set](/source/Index_set) - Index, the label of a summand in [Σ-notation](/source/Sigma_notation) of a summation #### Algebra - [Index of a subgroup](/source/Index_of_a_subgroup), the number of a subgroup's left cosets - Index, the degree of an [*n*th root](/source/Nth_root) - Index of a [linear map](/source/Linear_map#Index), the dimension of the map's kernel minus the dimension of its cokernel - Index of a [matrix](/source/Matrix_(mathematics)) - Index of a real [quadratic form](/source/Quadratic_form) #### Analysis - Index, the [winding number](/source/Winding_number) of an oriented closed curve on a surface relative to a point on that surface - [Diversity index](/source/Diversity_index), a measure of distribution or variety in fields such as ecology or information science - [Index of a vector field](/source/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](/source/Discrete_logarithm) of a number #### Statistics - [Index (statistics)](/source/Index_(statistics)), a type of aggregate measure - [Scale (social sciences)](/source/Scale_(social_sciences)), a method of reporting data in social sciences, sometimes called an index ### Other uses in science and technology - [Indexicality](/source/Indexicality), in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs - [Indexing (motion)](/source/Indexing_(motion)), in mechanical engineering and machining, movement to a precisely known location - [Index (physical sciences)](/source/Index_(physical_sciences)), a synonym for ratio ## Other uses - *INDEX*, earlier name for the [Reimei](/source/Reimei) satellite - [Index:](/source/Index%3A), a Danish nonprofit organization that promotes Design for Life - [The Index (Dubai)](/source/The_Index_(Dubai)), a skyscraper - [Index (crater)](/source/Index_(crater)), a Moon crater - In [semiotics](/source/Semiotics), an unintentional and non-arbitrary sign causally related to what it indicates, for example the smoke from a fire or the footprint of an animal. ## See also - [Indexi](/source/Indexi), a Yugoslav rock band - [Indexer (disambiguation)](/source/Indexer_(disambiguation)) - [Directory (disambiguation)](/source/Directory_(disambiguation)) - [All pages with titles beginning with *Index*](https://en.wikipedia.org/wiki/Special:PrefixIndex/Index) - [All pages with titles containing *Index*](https://en.wikipedia.org/wiki/Special:Search/intitle:%22Index%22) Topics referred to by the same term This [disambiguation](https://en.wikipedia.org/wiki/Help:Disambiguation) page lists articles associated with the title **Index**. If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Index&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article. --- Adapted from the Wikipedia article [Index](https://en.wikipedia.org/wiki/Index) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Index?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.