paddock
Area where horses are saddled and paraded before being taken onto the track.
pasteboard track
A lightning fast racing surface.
pole(s)
Markers at measured distances around the track designating the distance from the finish. The quarter pole, for instance, is a quarter of a mile from the finish, not from the start.
post
1) Starting point for a race. 2) An abbreviated version of post position. For example, “He drew post four.” 3) As a verb, to record a win. For example, “He’s posted 10 wins in 14 starts.”