(chess) time trouble, time pressure, a situation where a player has little time to complete the required moves

(law) Actual knowledge of copyright infringement, which may mean that an online service provider bears more liability for its users' actions than if it had no such knowledge.

Initialism of Fellow of the Royal College of Surgeons. / Initialism of Fellowship of the Royal College of Surgeons.

(mathematics) A half space that does not include the plane that bounds it