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Index (or its plural form indices) may refer to:


Arts, entertainment, and media


Fictional entities

* Index (''A Certain Magical Index''), a character in the light novel series ''A Certain Magical Index'' * The Index, an item on a Halo megastructure in the ''Halo'' series of video games


Periodicals and news portals

* '' Index Magazine'', a publication for art and culture *
Index.hr Index.hr is a Croatian tabloid online newspaper, launched in December 2002 and based in Zagreb. It was founded by Matija Babić and was originally designed as a news aggregation website, providing news content from Croatia, Serbia and Bosnia ...
, a Croatian online newspaper *
index.hu Index.hu is a Hungarian news website covering both Hungarian and international news. In 2018, it was the most visited Hungarian website with an average of 1.5 million daily readers. While most of the website's articles are written in Hungarian, ...
, a Hungarian-language news and community portal * ''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 The ''Truman State University Index'' is a weekly student newspaper distributed at Truman State University and throughout the Kirksville, Missouri community. The publication is entirely student-run and funded mostly through its own advertising rev ...
'', a student newspaper


Other arts, entertainment and media

*
The Index (band) The Index were an American garage rock/psychedelic rock band from Grosse Pointe, Michigan who were active from 1966-1969 and are known for a sound characterized by droning guitars, as heard on their two albums, both released in 1968. Though they ...
* ''Indexed'', a Web cartoon by
Jessica Hagy Jessica Hagy is known for the online cartoon Indexed which is a collection of charts and diagrams hand drawn on 3x5 index cards and organized into a blog format. She has compiled her cartoons into a book called ''Indexed''. The cartoon has also ...
* ''Index'', album by
Ana Mena Ana Mena Rojas (born 25 February 1997) is a Spanish singer and actress. She began her career in 2009 in the TV series ''Marisol, la película'' (2009). In 2010, she participated in Disney's musical reality show ''My Camp Rock 2'', ending up as th ...


Business enterprises and events

* Index (retailer), a former UK catalogue retailer *
INDEX Index (or its plural form indices) may refer to: Arts, entertainment, and media Fictional entities * Index (''A Certain Magical Index''), a character in the light novel series ''A Certain Magical Index'' * The Index, an item on a Halo megastru ...
, a market research fair in Lucknow, India *
Index Corporation , formerly known as , is a Japanese corporate information and communications technology company owned by Sawada Holdings. "Index Corporation" was a corporate name used by three different Japanese companies, between 1997 and 2016, the last one be ...
, a Japanese video game developer


Finance

* Index fund, a collective investment scheme *
Stock market index In finance, a stock index, or stock market index, is an index that measures a stock market, or a subset of the stock market, that helps investors compare current stock price levels with past prices to calculate market performance. Two of the ...
, a statistical average of prices of selected securities


Places in the United States

*
Index, Arkansas Index is an unincorporated community in Miller County, Arkansas Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the so ...
, an unincorporated community * Index, Kentucky, an unincorporated community *
Index, Missouri Index is an extinct town in Cass County, in the U.S. state of Missouri. Index was plat In the United States, a plat ( or ) (plan) is a cadastral map, drawn to scale, showing the divisions of a piece of land. United States General Land Of ...
, a ghost town *
Index, New York Index is a hamlet in the Town of Hartwick, New York, and partially in Town of Otsego, Otsego County, New York, United States. It is located at the corner of CR-11 and NY-28. Oaks Creek runs east through the hamlet and converges with the Susq ...
, a hamlet in Hartwick and Otsego, New York *
Index, Virginia Index is an unincorporated community located in King George County, in the U. S. state of Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between ...
, an unincorporated community * Index, Washington, a town * Index, West Virginia, an unincorporated community


Publishing and library studies

*
Bibliographic index A bibliographic index is a bibliography intended to help find a publication. Citations are usually listed by author and subject in separate sections, or in a single alphabetical sequence under a system of authorized headings collectively known a ...
, a regularly updated publication that lists articles, books, or other information items *
Citation index A citation index is a kind of bibliographic index, an index of citations between publications, allowing the user to easily establish which later documents cite which earlier documents. A form of citation index is first found in 12th-century Hebr ...
* The ''Index'', colloquial name for ''Germany's List of Media Harmful to Young People'', published by the Bundesprüfstelle für jugendgefährdende Medien *
Index card An index card (or record card in British English and system cards in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data. A collection of such cards ei ...
, 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 index (plural: usually indexes, more rarely indices; see below) is a list of words or phrases ('headings') and associated pointers ('locators') to where useful material relating to that heading can be found in a document or collection of doc ...
, an organized list of information in a publication * Index (typography), a hand- or fist-shaped punctuation mark *
Subject indexing Subject indexing is the act of describing or classifying a document by index terms, keywords, or other symbols in order to indicate what different documents are ''about'', to summarize their contents or to increase findability. In other words, i ...
, describing the content of a document by keywords *
Thumb index A thumb index, also called a cut-in index or an index notch, is a round cut-out in the pages of dictionaries, encyclopedias, Bibles and other large religious books, and various sectioned, often alphabetic, reference works, used to locate entries ...
, 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 In computer science, an associative array, map, symbol table, or dictionary is an abstract data type that stores a collection of (key, value) pairs, such that each possible key appears at most once in the collection. In mathematical terms an a ...
* Index (typography), a character in Unicode, its code is 132 * Index, the dataset maintained by
search engine indexing Search engine indexing is the collecting, parsing, and storing of data to facilitate fast and accurate information retrieval. Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, and ...
*
Array index In computer science, an array is a data structure consisting of a collection of ''elements'' (values or variables), each identified by at least one ''array index'' or ''key''. An array is stored such that the position of each element can be co ...
, 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 Index mapping (or direct addressing, or a trivial hash function) in computer science describes using an array, in which each position corresponds to a key in the universe of possible values. The technique is most effective when the universe of keys ...
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 (an acronym for indexed sequential access method) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys. Indexes of key fields are maint ...
(ISAM), used for indexing data for fast retrieval * Lookup table, a data structure used to store precomputed information *
Site map A sitemap is a list of pages of a web site within a domain. There are three primary kinds of sitemap: * Sitemaps used during the planning of a website by its designers. * Human-visible listings, typically hierarchical, of the pages on a site. * ...
, 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 In mathematics, an index set is a set whose members label (or index) members of another set. For instance, if the elements of a set may be ''indexed'' or ''labeled'' by means of the elements of a set , then is an index set. The indexing consis ...
* Index, the label of a summand in Σ-notation of a summation


Algebra

*
Index of a subgroup In mathematics, specifically group theory, the index of a subgroup ''H'' in a group ''G'' is the number of left cosets of ''H'' in ''G'', or equivalently, the number of right cosets of ''H'' in ''G''. The index is denoted , G:H, or :H/math> or ...
, the number of a subgroup's left cosets * Index, the degree of an ''n''th root * Index of a linear map, the dimension of the map's kernel minus the dimension of its cokernel * Index of a
matrix Matrix most commonly refers to: * ''The Matrix'' (franchise), an American media franchise ** '' The Matrix'', a 1999 science-fiction action film ** "The Matrix", a fictional setting, a virtual reality environment, within ''The Matrix'' (franchi ...
* Index of a real
quadratic form In mathematics, a quadratic form is a polynomial with terms all of degree two (" form" is another name for a homogeneous polynomial). For example, :4x^2 + 2xy - 3y^2 is a quadratic form in the variables and . The coefficients usually belong t ...


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) In the social sciences, scaling is the process of measuring or ordering entities with respect to quantitative attributes or traits. For example, a scaling technique might involve estimating individuals' levels of extraversion, or the perceived qual ...
, 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 The Valve Index is a consumer virtual reality headset created and manufactured by Valve. Announced on April 30, 2019, the headset was released on June 28 of the same year. The Index is a second-generation headset and the first to be manufacture ...
, 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) * * {{disambiguation, geo