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Index 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 New York City (NYC), often simply called New York, is the List of United States cities by population, most populous city in the United States. With an estimated 2019 population of 8,336,817 distributed ...
'', a publication for art and culture *
Index.hr Index.hr is a Croatia :* french: link=no, République de Croatie :* hu, Horvát Köztársaság :* it, Repubblica di Croazia :* rue, Републіка Хорватія :* sr, Република Хрватска :* sk, Chorvátska republ ...
, 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 HungarianHun ...
, 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 suppor ...

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 Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the Unit ...
'', a student newspaper


Other arts, entertainment and media

*
The Index (band) The Index were an American garage rock/ psychedelic rock band from Grosse Point, Michigan Michigan () is a U.S. state, state in the Great Lakes region, Great Lakes and Upper Midwest regions of the United States. Its name comes from the O ...
* ''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 February 25, 1997) is a Spanish singer and actress. She began her career in 2011 in the TV series ''Marisol, la película'' (2011). In 2010 Ana Mena participated in Disney's musical reality show "My Camp Rock 2", ending up as t ...


Business enterprises and events

*
Index (retailer) Index was a catalogue retailer in the United Kingdom, that was owned by Littlewoods from 1985 until 2005. Many Index stores were attached to Littlewoods stores. It was a well known retailer in the 1980s and the 1990s, but sales declined in the no ...
, a former UK catalogue retailer *
INDEX Index 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 ...

INDEX
, a market research fair in Lucknow, India *
Index Corporation , formerly known as , is a Japanese corporate information and communications technology Information and communications technology (ICT) is an extensional term for information technology (IT) that stresses the role of unified communicationsUnifi ...
, a Japanese video game developer


Finance

*
Index fund An index fund (also index tracker) is a mutual fund A mutual fund is a professionally managed investment fund An investment fund is a way of investment, investing money alongside other investors in order to benefit from the inherent advantages ...
, a collective investment scheme *
Stock market index In finance, a stock index, or stock market index, is an Index (economics), 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 performa ...
, a statistical average of prices of selected securities


Places in the United States

*
Index, Arkansas Index is an unincorporated community File:Entering Heinola, Minnesota.jpg, Sign at Heinola, Minnesota, Heinola, an unincorporated community in Otter Tail County, Minnesota An unincorporated area is a region not governed by a local municipal corpo ...
, an unincorporated community *
Index, Kentucky Index is an unincorporated community File:Entering Heinola, Minnesota.jpg, Sign at Heinola, Minnesota, Heinola, an unincorporated community in Otter Tail County, Minnesota An unincorporated area is a region not governed by a local municipal cor ...
, an unincorporated community *
Index, Missouri Index is an extinct town in Cass County, in the U.S. state In the United States The United States of America (USA), commonly known as the United States (U.S. or US), or America, is a country Contiguous United States, primarily located ...
, a ghost town *
Index, New York Index is a small hamlet in the Town of Hartwick, New York, and partially in Town of Otsego, New York. It is located at the corner of CR-11 and NY-28. Oaks Creek runs east through the hamlet and converges with the Susquehanna River just east of t ...
, a hamlet in Hartwick and Otsego, New York *
Index, Virginia Index is an unincorporated community File:Entering Heinola, Minnesota.jpg, Sign at Heinola, Minnesota, Heinola, an unincorporated community in Otter Tail County, Minnesota An unincorporated area is a region not governed by a local municipal corpo ...
, an unincorporated community *
Index, Washington Index is a town in Snohomish County, Washington, United States The United States of America (USA), commonly known as the United States (U.S. or US), or America, is a country Contiguous United States, primarily located in North America. I ...
, a town *
Index, West Virginia Index is an unincorporated community File:Entering Heinola, Minnesota.jpg, Sign at Heinola, Minnesota, Heinola, an unincorporated community in Otter Tail County, Minnesota An unincorporated area is a region not governed by a local municipal corp ...
, 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 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 ...
* The ''Index'', colloquial name for ''Germany's List of Media Harmful to Young People'', published by the
Bundesprüfstelle für jugendgefährdende Medien The Federal Review Board for Media Harmful to Minors (german: link=no, Bundesprüfstelle für jugendgefährdende Medien or ''BPjM'') is an upper-level German federal agency subordinate to the Federal Ministry of Family Affairs, Senior Citize ...
*
Index card An index card (or record card in British English British English (BrE) is the standard dialect A standard language (also standard variety, standard dialect, and standard) is a language variety that has undergone substantial codifica ...
, used for recording and storing small amounts of data * ''
Index Librorum Prohibitorum The ''Index Librorum Prohibitorum'' ("List of Prohibited Books") was a list of publications deemed heretical Heresy is any belief or theory that is strongly at variance with established beliefs or customs, in particular the accepted belie ...
'', a list of publications which the Catholic Church censored *
Index on Censorship Index on Censorship is an organization campaigning for freedom of expression in London, 1974 Freedom of speech is a principle that supports the freedom Freedom, generally, is having the ability to act or change without constraint. Someth ...
, 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 ...
, an organized list of information in a publication *
Index (typography) The manicule, , is a typographic 225px, Movable type being assembled on a composing stick using pieces that are stored in the type case">composing_stick.html" ;"title="Movable type being assembled on a composing stick">Movable type being ...
, a hand- or fist-shaped punctuation mark *
Subject indexing Subject indexing is the act of describing or classifying a document A document is a written Writing is a medium of human communication Communication (from Latin ''communicare'', meaning "to share") is the act of developing Semantics, m ...
, 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 A dictionary is a listing of lexeme A lexeme () is a unit of lexical meaning that underlies a set of words that are related thro ...
, 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 A website (also written as web site) is a collection of web page A web page (or webpage) is a hypertext Hypertext is text displayed on ...
, Internet indexing


Science, technology, and mathematics


Computer science

* Index, a key in an
associative array In computer science Computer science deals with the theoretical foundations of information, algorithms and the architectures of its computation as well as practical techniques for their application. Computer science is the study of , ...
*
Index (typography) The manicule, , is a typographic 225px, Movable type being assembled on a composing stick using pieces that are stored in the type case">composing_stick.html" ;"title="Movable type being assembled on a composing stick">Movable type being ...
, a character in Unicode, its code is 132 * Index, the dataset maintained by
search engine indexingSearch engine indexing is the collecting, parsing, and storing of data to facilitate fast and accurate information retrieval Information retrieval (IR) in computing and information science is the process of obtaining information system resources t ...
*
Array index ARRAY, also known as ARRAY Now, is an independent distribution company launched by film maker and former publicist Ava DuVernay in 2010 under the name African-American Film Festival Releasing Movement (AFFRM). In 2015 the company rebranded itsel ...
, an integer pointer into an array data structure *
BitTorrent index BitTorrent (abbreviated to BT) is a communication protocol for peer-to-peer file sharing Peer-to-peer file sharing is the distribution and sharing of digital media Digital media means any media (communication), media that are encoded in Mac ...
, a list of .torrent files available for searches *
Database index A database index is a data structure Image:Hash table 3 1 1 0 1 0 0 SP.svg, 315px, A data structure known as a hash table. In computer science, a data structure is a data organization, management, and storage format that enables efficient access ...
, a data structure that improves the speed of data retrieval *
Index mapping Index mapping (or direct addressing, or a trivial hash function A hash function is any function Function or functionality may refer to: Computing * Function key A function key is a key on a computer A computer is a machine that can ...
of raw data for an array *
Index register An index register in a computer's CPU A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuit File:PExdcr01CJC.jpg, 200px, A circuit built on a printed circuit board (PCB ...
, a processor register used for modifying operand addresses during the run of a program *
Indexed color In computing, indexed color is a technique to manage digital images' colors in a limited fashion, in order to save computer computer data storage, memory and Hard disk drive, file storage, while speeding up display refresh and file transfers. It ...
, 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 key (computing), keys. Indexes of key fi ...
(ISAM), used for indexing data for fast retrieval *
Lookup table In computer science, a lookup table (LUT) is an array data structure, array that replaces runtime (program lifecycle phase), runtime computation with a simpler array indexing operation. The process is termed as "direct addressing" and LUTs differ fr ...
, a data structure used to store precomputed information *
Site map A site map (or sitemap) is a list of pages Page most commonly refers to: * Page (paper) A page is one side of a leaf A leaf (plural leaves) is the principal lateral appendage of the vascular plant plant stem, stem, usually borne abo ...
, or site index, a list of pages of a web site accessible to crawlers or users *
Web indexing Web indexing, or internet indexing, comprises methods for indexing the contents of a website A website (also written as web site) is a collection of web page A web page (or webpage) is a hypertext Hypertext is text displayed on ...
, Internet indexing *
Webserver directory index When an HTTP The Hypertext Transfer Protocol (HTTP) is an application layer An application layer is an abstraction layer that specifies the shared communications protocols and Interface (computing), interface methods used by Host (network) ...
, a default or index web page in a directory on a web server, such as index.html


Economics

*
Index (economics) In Statistics Statistics is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data Data (; ) are individual facts, statistics, or items of information, often numeric. In a mo ...
, a single number calculated from an array of prices and quantities **
Price index A price index (''plural'': "price indices" or "price indexes") is a normalized average (typically a weighted average) of price A price is the (usually not negative) quantity of payment or compensation given by one party to another in re ...
, 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 In mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as quantity (number theory), mathematical structure, structure (algebra), space (geometry), and calculus, change (mathematical analysis, analysis). It h ...
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 (mathematics), set may be ''indexed'' or ''labeled'' by means of the elements of a set , then is an index set. Th ...
* Index, the label of a summand in Σ-notation of a summation


Algebra

*
Index of a subgroupIn mathematics, specifically group theory, the index of a subgroup ''H'' in a group ''G'' is the number of left Coset, cosets of ''H'' in ''G'', or equivalently, the number of right cosets of ''H'' in ''G''. The index is denoted , G:H, or :Hor ...
, the number of a subgroup's left cosets * Index, the degree of an ''n''th root * Index of a
linear map In mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as quantity (number theory), mathematical structure, structure (algebra), space (geometry), and calculus, change (mathematical analysis, analysis). I ...

linear map
, the dimension of the map's kernel minus the dimension of its cokernel * Index of a
matrix Matrix or MATRIX may refer to: Science and mathematics * Matrix (mathematics), a rectangular array of numbers, symbols, or expressions * Matrix (logic), part of a formula in prenex normal form * Matrix (biology), the material in between a eukaryoti ...
* Index of a real
quadratic form In mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as quantity (number theory), mathematical structure, structure (algebra), space (geometry), and calculus, change (mathematical analysis, analysis). It ...


Analysis

* Index, the
winding number In mathematics Mathematics (from Greek: ) includes the study of such topics as numbers (arithmetic and number theory), formulas and related structures (algebra), shapes and spaces in which they are contained (geometry), and quantities and ...

winding number
of an oriented closed curve on a surface relative to a point on that surface *
Diversity index A diversity index is a quantitative measure that reflects how many different types (such as species In biology Biology is the natural science that studies life and living organisms, including their anatomy, physical structure, Biochemist ...
, a measure of distribution or variety in fields such as ecology or information science *
Index of a vector field In vector calculus Vector calculus, or vector analysis, is concerned with derivative, differentiation and integral, integration of vector fields, primarily in 3-dimensional Euclidean space \mathbb^3. The term "vector calculus" is sometimes us ...
, an integer that helps to describe the behaviour of a vector field around an isolated zero


Number theory

* Index, or the
discrete logarithm In mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as quantity (number theory), mathematical structure, structure (algebra), space (geometry), and calculus, change (mathematical analysis, analysis). It ...
of a number


Statistics

*
Index (statistics)In statistics and research design Research design refers to the overall strategy utilized to carry out research Research is "creativity, creative and systematic work undertaken to increase the stock of knowledge". It involves the collection ...
, 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 Tooth wear refers to loss of tooth A tooth (plural teeth) is a hard, calcified Calcification is the accumulation of calcium salts in a Tissue (biology), body tissue. It normally occurs in the formation of bone, but calcium can be deposited a ...
, standardized scoring systems for tooth problems *
Indexicality In semiotics Semiotics (also called semiotic studies) is the study of sign processes (semiosis), which are any activity, conduct, or process that involves Sign (semiotics), signs, where a sign is defined as anything that communicates a Meaning (sem ...
, in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs *
Indexing (motion)Indexing in reference to motion is moving (or being moved) into a new position or location quickly and easily but also precisely. When indexing a machine part, its new location is known to within a few hundredths of a millimeter (thousandths of an in ...
, in mechanical engineering and machining, movement to a precisely known location *
Refractive index In optics, the refractive index (also known as refraction index or index of refraction) of a optical medium, material is a dimensionless number that describes how fast EM radiation, light travels through the material. It is defined as :n = \frac ...

Refractive index
, a measurement of how light propagates through a material *
Valve Index Valve Index is a virtual reality headset created and manufactured by Valve A valve is a device or Heart valve, natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by openin ...
, a virtual reality headset


Other uses

* ''INDEX'', earlier name for the
Reimei Reimei ('Dawn') is the in-flight name for a small Japanese satellite known during development as INDEX (INnovative-technology Demonstration Experiment), developed in-house at JAXA The is the Japanese national aerospace and space agency. Thro ...
satellite * Index:, a Danish nonprofit organization which promotes Design for Life *
The Index (Dubai) The Index is a tall, 80-storey A storey (British English British English (BrE) is the standard dialect of the English language English is a West Germanic languages, West Germanic language first spoken in History of Anglo-Saxon E ...
, a skyscraper *
Index (crater) Index is a feature on Earth's Moon The Moon is Earth's only natural satellite. At about one-quarter the diameter of Earth (comparable to the width of Australia (continent), Australia), it is the largest natural satellite in the Solar Sys ...
, a moon crater


See also

*
Indexer (disambiguation) An indexer may refer to: * Indexer (programming) In object-oriented programming, an indexer allows instances of a particular class or struct to be indexed just like arrays. It is a form of operator overloading. Implementation Indexers are imple ...
* * {{disambiguation, geo