Final answer:
The turn post at the end of a horse race is called the finish line. It is where the horses cross to determine the winner of the race.
Step-by-step explanation:
The turn post at the end of a horse race is called the finish line. It is the point where the horses cross to determine the winner of the race. The finish line is typically marked by a white strip on the ground or a horizontal banner suspended above the track. In some races, there may also be a photo finish technology used to determine the winner in case of a close race.