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{{for|Wikipedia’s index|Wikipedia:Index|selfref=y}}
[[de:Index]] [[fr:indice]] [[ja:索引]] [[nl:Index]]
{{wiktionary|Index|index|indexes|indice|indices}}
:''See Also [[Index, Washington]], {[United States]].
'''Index''' ({{plural form}}: '''indexes''' or '''indices''') may refer to:
{{tocright}}


==Arts, entertainment, and media==
An '''index''' (pl. indices, sometimes indexes) is a pointer (literally - note that the index finger is the one which points, or ''indicates'') that takes you to information. Traditionally indices are found at the back of books. They complement the contents page because they give access to information by its specific name; contents pages, on the other hand, give access through broad categories. Indices are usually organised alphabetically; contents pages are organised according to the order of pages in the book.
===Fictional entities===
* [[Index (A Certain Magical Index)|Index (''A Certain Magical Index'')]], the titular character of 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===
Indexing skills have also been applied to periodicals and databases, and [[web indexing]] is now becoming important.
* ''[[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 ==
In [[mathematics]], an '''index''' is a [[superscript]] or [[subscript]] to a symbol. Superscript indices are often, but not always, used to indicate [[exponentiation|powers]]. Subscript indices are usually used to label a set or sequence of variables. See also [[index set]].
* [[Index (retailer)]], a former UK catalogue retailer
* [[INDEX]], a market research fair in Lucknow, India
* [[Index Corporation]], a Japanese video game developer


==Finance==
The [[index of a subgroup]] is the number of its left [[coset]]s (which is equal to the number of its right cosets).
* [[Index fund]], a collective investment scheme
* [[Stock market index]], a statistical average of prices of selected securities


==Places in the United States==
The index of a [[Fredholm operator]] is the dimension of its [[kernel (algebra)|kernel]] minus the dimension of its [[cokernel]].
* [[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==
The index of a real [[quadratic form]] ''Q'' is defined (but not always consistently) as ''p'' − ''q'' where ''Q'' can be written as a difference of ''p'' squared linear terms and ''q''squared linear terms.
* [[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
* [[Web server directory index]], a default or index web page in a directory on a web server, such as index.html


===Economics===
In [[computer science]], an '''index''' is usually used for expressing an ''n''th element. Indices are usually expressed as [[integer]]s.
* [[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===
When talking about [[databases]], '''index'''ing is a technique used by most current [[database management system]]s to speed up particular kinds of queries (usually by internally generating and storing redundant information to more quickly locate table entries).
* 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
In [[Roman Catholicism]] the '''Index''' is the ''[[Index librorum prohibitorum]]'' created in 1559, the list of books that obedient Catholics were forbidden to read.
* [[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 that promotes Design for Life
* [[The Index (Dubai)]], a skyscraper
* [[Index (crater)]], a Moon crater

==See also==
* [[Indexer (disambiguation)]]
* {{Look from}}
* {{In title}}

{{disambiguation|geo}}

Latest revision as of 03:25, 7 December 2024

For Wikipedia’s index, see Wikipedia:Index.
Look up Index, index, indexes, indice, or indices in Wiktionary, the free dictionary.

Index (pl.: indexes or indices) may refer to:

Arts, entertainment, and media

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Fictional entities

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Periodicals and news portals

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Other arts, entertainment and media

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Business enterprises and events

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Finance

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Places in the United States

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Publishing and library studies

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Science, technology, and mathematics

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Computer science

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Economics

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Mathematics and statistics

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  • 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

[edit]

Analysis

[edit]
  • 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

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Statistics

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Other uses in science and technology

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  • 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

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See also

[edit]
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