# Index

(Redirected from Indexing)
For Wikipedia’s index, see Wikipedia:INDEX.

Index may refer to:

## Publishing

• Bibliographic index, a regularly updated print periodical publication that lists articles, books, and/or other information items, usually within a particular discipline
• Citation index
• Index (publishing), a detailed list, usually arranged alphabetically, of the specific information in a publication
• Index (typography), a (rare today) punctuation mark
• Index cards in a rolodex, an old library card catalog or other organizational purpose, usually but not always 3" x 5", early and mid-20th century technologies for maintaining list of information, and in the card catalog also useful for cross-referencing information
• Germany's List of Media Harmful to Young People, colloquially known as The Index, published by the Bundesprüfstelle für jugendgefährdende Medien
• Index Librorum Prohibitorum, a list of publications which the Catholic Church censored (translates loosely from Latin as : "Banned Book List")
• Index Librorum Prohibitorum, a character from the Japanese light novel, anime and manga A Certain Magical Index. "Index" may refer either to the character or the series
• Index Magazine, a New York City-based publication for art and culture
• Index on Censorship, a publishing organization that campaigns for freedom of expression, produces a quarterly magazine of the same name
• index.hu, a Hungarian-language news and community portal
• Indexed (cartoon), a Web cartoon by Jessica Hagy
• The Index, the student newspaper of Kalamazoo College
• The Index, an 1860s European propaganda journal created by Henry Hotze to support the Confederate States of America during the American Civil War or, a European informational journal supporting the rebellion against the United States of America during the War Between the States.
• The Index, an American freethought weekly paper published 1869-1886 by Benjamin Franklin Underwood
• Thumb index, a round cut-out in the pages of a publication
• Truman State University Index, the weekly student newspaper of Truman State University

## Sciences

### Biological sciences

• Diversity index – a quantitative measure that increases when the number of types (distinct groups) into which a set of entities (a population) has been classified increases, and obtains its maximum value for a given number of types when all types are represented proportional to their number within the set of entities

### Economics

• Index (economics), a single number calculated from an array of prices and quantities
• Price index, a typical price for some good or service

### Linguistics

• Indexicality, the variation of meaning of an utterance according to certain features of the context in which it is uttered

### Mathematics

• A number or other symbol that indicates the location of a variable in an indexed family or set
• A numerical value attached to a mathematical object, such as those listed here under Algebra and Analysis
• The index of summation i is used to calculate a sum

#### Algebra

• The degree of an nth root
• The index of a subgroup is the number of a subgroup's left cosets (which is equal to the number of its right cosets).
• The index of a linear map, is the dimension of the map's kernel minus the dimension of its cokernel.
• The index of a real quadratic form Q is defined (but not always consistently) as pq, where Q can be written as a difference of p squared linear terms and q squared linear terms.
• The index of a matrix is the least integer k ≥ 0 such that rank(Ak+1) = rank(Ak).

#### Analysis

• The winding number of an oriented closed curve on a surface relative to a point on that surface; loosely speaking, the number of times the curve goes around the point counter-clockwise
• The index of a vector field v at an isolated zero is the degree of the map ${\displaystyle x^{a}\mapsto {\frac {v^{a}(x)}{\sqrt {\sum _{b}(v^{b}(x))^{2}}}}}$, taking points near the zero into the unit sphere111.

## Technologies

### Mechanics

• Indexing (motion), a kind of motion in many areas of mechanical engineering and machining

## Other usages

• Index:, a Danish nonprofit organization which promotes Design for Life
• The Index, an item on a halo megastructure in the Halo series of video games
• The Index (Dubai), a skyscraper in Dubai
• INDEX was the pre-launch name for the Reimei satellite