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An index is a system used to make finding information easier.

Index may also refer to:

• Index (publishing), a detailed list, usually arranged alphabetically, of the specific information in a publication
• Index cards in a rolodex or old library card catalog, early and mid 20th century technologies for maintaining such lists
• Index (mathematics), for various meanings of the word in mathematics
• Index (economics), a single number calculated from an array of prices and quantities. An index 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 An index card is heavy Paper stock cut to a standard size Index cards are often used for recording individual items of information that can then be easily rearranged and filed The word index is used in variety of senses in Mathematics. In perhaps the most frequent sense an index is a Superscript This article is about index in an economics and finance sense
• Index, Washington, a town in Snohomish County, Washington, United States
• Index, New York, a hamlet in the County and Town of Otsego, New York, United States
• Index (typography), a largely obsolete punctuation mark
• Indexing (motion), a kind of motion in many areas of mechanical engineering and machining

In publications:

• Index Librorum Prohibitorum, a list of publications which the Catholic Church censored
• Germany's List of Media Harmful to Young People, colloquially known as The Index, published by the Bundesprüfstelle für jugendgefährdende Medien
• Index Magazine, was a prominent New York City based publication for art and culture
• Truman State University Index, the weekly student newspaper
• The Index, the student newspaper of Kalamazoo College, published since 1877
• The Index (journal), a European propaganda journal created by Henry Hotze to support the Confederate States of America during the American Civil War

In computers and information retrieval:

• Index (database), a feature in a computerized database which allows quick access to the rows in a table
• Index (information technology), either an integer which identifies an array element, or a data structure which enables fast lookup
• Index (search engine), for supporting information retrieval in search engines
• Webserver directory index, a default or index web page in a directory on a web server, such as index. Index is a town in Snohomish County, Washington, United States. The symbol ☞ is a Punctuation mark called an index or fist. Indexing in reference to motion is moving (or being moved into a new position or location quickly and easily but also precisely The Index Librorum Prohibitorum ("List of Prohibited Books" was a list of publications prohibited by the Roman Catholic Church. The Bundesprüfstelle für jugendgefährdende Medien or BPjM (Federal Department for Media Harmful to Young Persons is an upper-level German federal agency subordinate Index Magazine was a prominent New York City based publication for Art and Culture. The Truman State University Index is a weekly Student newspaper distributed at Truman State University and throughout the Kirksville Kalamazoo College ( K College or K) is a private liberal arts college located in Kalamazoo, Michigan, United States Henry Hotze ( September 2, 1833 - April 19, 1887) was a Swiss -born propagandist for the Confederate States of America A database index is a Data structure that improves the speed of operations on a database table. This is referring to Index in the context of Information Technology Search engine indexing collects parses and stores data to facilitate fast and accurate information retrieval When an HTTP client (generally a Web browser) requests a URL that points to a directory structure instead of an actual web page within the directory the html
• Subject indexing, describing the content of a document by keywords
• BitTorrent index, a list of . Subject indexing is the act of describing a document by index terms to indicate what the document is about or to summarize its content. A BitTorrent index is a list of.torrent files (usually including descriptions and other information managed by a website that is available for searching files to download through torrent files available for searches

Other:

• The Index, an item on the Halo (megastructure) in the Halo series of video games
• The Index (Dubai), a tower under construction in Dubai
• Index (retailer), a defunct UK catalogue retailer formerly owned by the Littlewoods group and known as Littlewoods Index
• Index finger, the second digit of a human hand
• Index fund, a collective investment scheme
• Indexicality, in linguistics, the variation of meaning of an utterance according to certain features of the context in which it is uttered

Halos are fictional Megastructures and Superweapons in the Halo video game series The Index is a Mixed-use Skyscraper designed by Foster and Partners currently under construction in Dubai, United Arab Emirates. Index was a catalogue retailer in the United Kingdom, purchased by rival Argos in 2005 The second Digit of a human Hand is also referred to as the index finger, pointer finger, forefinger, trigger finger, digitus An index fund or index tracker is a Collective investment scheme (usually a Mutual fund or Exchange-traded fund) that aims to replicate the movements of In Linguistics and in Philosophy of language, an indexical behavior or utterance symbolically points to (or indicates) some state of affairs

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