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IS, I.S., Is, is, or i.s. may refer to:



  • 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
  • Iaşi County, Romania, (vehicle registration code)
  • Inverness TMD, a railway traction maintenance depot (depot code)
  • Province of Isernia, Italy (vehicle registration code)



Science and mathematics[edit]

  • Immune system, organic mechanisms that protect against disease
  • Insertion sequence, a short DNA transposable element
  • Intersex, an organism with sex characteristics neither exclusively male nor female
  • Importance sampling, a statistical technique for estimating properties of a particular distribution



  • .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

Vehicles and weaponry[edit]

Other uses[edit]

  • Island (Is.), any piece of land surrounded by water
  • iS – internal section, a video game developed by Square
  • Internal security, the work of keeping domestic peace by a national force
  • Investment—Saving, a curve in the IS/LM model
  • Is, a fact or empirical state, with finite limits in space and time, in is-ought philosophy

See also[edit]