Index

Index (pl.: indexes or indices) most commonly refers to:

Index (publishing), an organized list of information in a publication
Web indexing, Internet indexing
An index, a key in an associative array

Index may also 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 the Halo Array in the Halo video game series

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), 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
The Index: A Weekly Paper Devoted to Free Religion (1870–1886), the semi-official periodical of the Free Religious Association

Other arts, entertainment, 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

Index (typography), a hand- or fist-shaped punctuation mark
Bibliographic index, a regularly updated publication that lists articles, books, or other information items
Citation index
The Index, colloquial name for the List of Media Harmful to Youth and Adolescents (Germany)
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
Subject indexing, describing the content of a document by keywords
Thumb index, a round cut-out in the pages of a publication

Science, technology, and mathematics

Computer science

U+0084 <control-0084> Index, a character in Unicode
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 website accessible to crawlers or users
Web server 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

General

Index, the position of an element in a sequence
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 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
Index of a linear map, the dimension of the map's kernel minus the dimension of its cokernel
Index of a matrix
Index of a real quadratic form

Analysis

Cauchy index, characterizing poles of a rational function
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

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
Index (physical sciences), a synonym for ratio
INDEX, earlier name for the Reimei satellite

Other uses

Index:, a Danish nonprofit organization that promotes Design for Life
The Index (Dubai), a skyscraper
Index (crater), a Moon crater
In 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

Index

Arts, entertainment, and media

Fictional entities

Periodicals and news portals

Other arts, entertainment, media

Business enterprises and events

Finance

Places in the United States

Publishing and library studies

Science, technology, and mathematics

Computer science

Economics

Mathematics and statistics

General

Algebra

Analysis

Number theory

Statistics

Other uses in science and technology

Other uses

See also