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 ''index Magazine'' was a New York City-based publication with interviews with art and culture figures. It was created by Peter Halley and Bob Nickas in 1996, running until late 2005. Covering the burgeoning indie culture of the 1990s, ''Index' ...

'', 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 Henry Hotze (September 2, 1833 – April 19, 1887) was a Swiss Americans, Swiss American propagandist for the Confederate States of America during the American Civil War. He acted as a Confederate agent in Great Britain, attempting to build suppo ...

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 The Walt Disney Company, commonly known as Disney ...

Business enterprises and events

Index (retailer) Index was a catalogue retailer in the United Kingdom, that was owned by Littlewoods Littlewoods was a retail and football betting company founded in Liverpool, England, by John Moores in 1923. By the 1980s, it had grown to become the la ...

, a former UK catalogue retailer * INDEX, 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 An index fund (also index tracker) is a mutual fund or exchange-traded fund (ETF) designed to follow certain preset rules so that the fund can a specified basket of underlying investments.Reasonable Investor(s), Boston University Law Review, avai ...

, a collective investment scheme * Stock market index, 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 s ...

, an unincorporated community *

Index, Kentucky Index is an unincorporated community in Morgan County, Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders I ...

, 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, 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 t ...

, an unincorporated community * Index, Washington, a town *

Index, West Virginia Index is an unincorporated community in Gilmer County, West Virginia West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers ...

, 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 as ...

, 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 Hebre ...

* The ''Index'', colloquial name for ''Germany's List of Media Harmful to Young People'', published by the

Bundesprüfstelle für jugendgefährdende Medien The Federal Department for Media Harmful to Young Persons (german: link=no, Bundesprüfstelle für jugendgefährdende Medien or ''BPjM'') is an upper-level German federal censorship agency subordinate to the Federal Ministry of Family Affai ...

* 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) The manicule, , is a typographic mark with the appearance of a hand with its index finger extending in a pointing gesture. Originally used for handwritten marginal notes, it later came to be used in printed works to draw the reader's attentio ...

, 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 entrie ...

, a round cut-out in the pages of a publication *

Web indexing Web indexing, or internet indexing, comprises methods for indexing the contents of a website or of the Internet as a whole. Individual websites or intranets may use a back-of-the-book index, while search engines usually use keywords and metadata t ...

, Internet indexing

Science, technology, and mathematics

Computer science

* Index, a key in an associative array *

, 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 *

, 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