Index

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 and 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 • 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 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 • 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 • 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 ==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 • 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. ==See also==