# IS

IS may refer to:

## Arts and media
### Literature

* Book of Isaiah, a biblical text
* Is (novel), a novel by Joan Aiken
* i"s, a manga by Masakazu Katsura
* iS (manga), a manga by Chiyo Rokuhana
* Infinite Stratos, a Japanese light novel series

### Other media

* is (album), a 1969 album by jazz pianist Chick Corea
* is, a 2012 album by Canadian pop band Hey Ocean!
* iS – internal section, a video game developed by Square

## Businesses and organisations

* Intermediate school, education between primary and secondary schools areas, also known as middle school
* Ilta-Sanomat, a newspaper in Finland
* Intelligent Systems, a first-party video game developer and internal team of Nintendo
* International Socialists (disambiguation), several Trotskyist political organizations
* Investment—Saving, a curve in the IS/LM model of economics
* IRS Airlines (IATA code)
* Island Airlines (IATA code)

## Language

* Is, the third-person singular present tense of the English language verb "to be", frequently used as a copula
* Icelandic language (ISO 639-1 alpha-2 code)
* International Sign, a pidgin sign language
* Is (rune) (ᛁ), a rune of the Anglo-Saxon fuþorc

## Places

* Island (Is.), any piece of land surrounded by water
* Iceland (ISO 3166-1 alpha-2 country code)
* Israel (NATO country code)
* Hīt, or Is, an Iraqi town on the Euphrates River
* Ys or Is, a mythical city of Brittany
* Iași County, Romania, (vehicle registration code)
* Inverness TMD, a railway traction maintenance depot (depot code)
* Province of Isernia, Italy (vehicle registration code)

## Science and mathematics

* Immune system, organic mechanisms that protect against disease
* Immunosuppression
* Importance sampling, a statistical technique for estimating properties of a particular distribution
* Infrasound, sound frequencies below the human range of hearing
* Insertion sequence, a short DNA transposable element
* Intersex, an organism with sex characteristics neither exclusively male nor female

## Technology
### Computing

* .is, the Internet country-code top-level domain for Iceland
* Information science, the study of data collection, manipulation, and dissemination
* Information systems, organizations of data-processing persons, records, and activities
* InstallShield, a software tool for creating software installers for Microsoft Windows
* IntelliStar, a computer system used to display local forecasts on The Weather Channel
* the relational operator is, used in Python
* the type comparison operator is, used in C#

### Vehicles and weaponry

* IS tank, a Soviet heavy tank in World War II.
* Istrebitel Sputnikov or "Destroyer of Satellites", a Soviet anti-satellite weapons program.
* Lexus IS, a sports car made by Lexus.
* Locomotive IS, a Soviet passenger steam locomotive.
* Nikitin-Shevchenko IS, a Soviet fighter aircraft.

### Other uses in technology

* Image stabilization, a family of techniques to reduce blur caused by lens shakes
* Canon Image Stabilizer, a lens-based image stabilization technology by Canon
* Intrinsic safety, a protection technique for electronic equipment in explosive atmospheres
* Indian Standard, developed by the Bureau of Indian Standards, for example IS 456
* International Standard, a mounting standard for the calipers and rotors of disc-type bicycle brake systems

## Other uses

* Internal security, the work of keeping domestic peace by a national force
* International studies, or International relations, the study of politics, economics and law on a global level
* Is, in is-ought philosophy, a fact or empirical state with finite limits in space and time
* Old Israeli Shekel, commonly denominated as IS
* Islamic State, transnational Salafi jihadist group and unrecognized quasi-state