The Isk are one-half of the species called the Iskoort in the fictional Animorphs books by K. A. Applegate. They are the physical bodies built to house the Yoort, which are slug-like creatures similar to the Yeerk. Unlike the Yeerks, however, the Isk and the Yoort are symbiotes. They are slightly shorter than humans, and have roughly triangular heads.

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ISK is also the name given to the monetary units in EVE Online. EVE Online is a massive multiplayer online game developed and owned by CCP Games, Iceland.

• http://www.eve-online.com/
• http://www.ccpgames.com/ol/about.html