The term 'LOB Trajectory' refers to the ARC of a ball in flight, usually in a sport such as baseball or golf. The acronym 'ARC' is used to describe this trajectory, which is the path the ball takes from the point of release to the point of impact. This ARC is determined by the speed and spin of the ball, as well as the angle of release. The ARC of the ball can be used to determine the distance it will travel and the accuracy of the shot.