Index

Index (Latin for "index finger, marker, directory"), plural indices or indexes, stands for:

Register (reference work), ordered index
Key figure, comparative figure
Index (semiotics), reference sign
Database index, indexing of databases
in computer science a value specification for addressing an element, see field (data type) #Indices
index finger, as a technical term in medicine
Graduation mark on a dial
☞, as a symbol or punctuation mark, see index finger #Typography and EDP

Censorship:

Blacklist, colloquially a negative list
Index librorum prohibitorum, conceptual Catholic index of forbidden books
List of works classified as dangerous in Germany, see Bundesprüfstelle für jugendgefährdende Medien (Federal Review Board for Media Harmful to Young Persons)

Mathematics:

Index (group theory), number of subclasses
mathematical numbering element, see index set (mathematics)
power of an equivalence relation, see equivalence relation #set of equivalence classes and index
Index of a vector field, see Poincaré-Hopf theorem #Index of a vector field
analytical index of a differential operator, see Fredholm operator
topological invariant in function theory, see orbital number (mathematics)
Signature of a bilinear form, see Signature (Linear Algebra)
in geometry a characteristic feature of a quadratic set

Facilities:

Index - Word and Effect, Swiss Authors' Collective
Index-Werke, German group of companies
Index (discotheque), discotheque in Schüttorf, Lower Saxony
Index.hu, Hungarian news portal
Index Ventures, venture capital company

Geography:

Index (Washington), city in the USA
Index Peak, mountain in Grahamland, Antarctica
Index Peak (Wyoming), mountain in Wyoming, USA
Index Point, headland on the Borchgrevink coast of Victoria Land, Antarctica

See also:

Questions and Answers

Q: What is an index?

A: An index is a system used to make finding information easier. It can be a detailed list, usually arranged alphabetically, of the specific information in a publication, or it can refer to various meanings of the word in mathematics or economics.

Q: What are some examples of indexes?

A: Examples of indexes include Index Librorum Prohibitorum (a list of publications which the Catholic Church censored), Germany's List of Media Harmful to Young People (also known as The Index), Index Magazine (a prominent New York City based publication for art and culture), Truman State University Index (the weekly newspaper distributed at Truman State University and throughout the Kirksville, Missouri community), The Index (the student newspaper of Kalamazoo College published since 1877), The Index (a European propaganda journal created by Henry Hotze to support the Confederate States of America during the American Civil War).

Q: How are indexes used in computers and information retrieval?

A: In computers and information retrieval, an index can refer to either an integer which identifies an array element, or a data structure which enables fast lookup. It can also refer to supporting information retrieval in search engines or webserver directory index pages such as "index.html". Additionally, subject indexing describes content by keywords.

Q: Where is Index Washington located?

A: Index Washington is located in Snohomish County, Washington United States.