The term 'Racing Units' can be summarized as laps, which is a four letter word. Laps are a unit of measurement used in racing, such as in auto racing, horse racing, and running. A lap is the completion of a circuit around a track or course. In auto racing, a lap is usually measured by the number of times a car passes a certain point on the track. In horse racing, a lap is usually measured by the number of times a horse passes a certain point on the track. In running, a lap is usually measured by the number of times a runner passes a certain point on the track.