A high-energy turn (HET) is a maneuver that allows one to turn a starship very rapidly. The odds of success varies greatly upon the mass of the starship in question. By using additional energy, the ship can be made to turn at a much higher rate than usual. This allows a ship to make up to a 180° turn nearly instantaneously. It is also called a "warp turn" because performing an HET requires the generation of a warp field. Also, it requires some time to allow the warp field to be created and, as such, using HETs can be quite tricky. (Starfleet Command (game))