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 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.