What is a po in baseball?

A PO (putout) in baseball is a statistic that is recorded when a defensive player gets an out. It counts the total number of times a defensive player retires a batter or baserunner by catching or fielding a batted ball, tagging a baserunner or throwing him out, or recording a force out. Generally, the catcher and infielders have more POs than outfielders, because they are closer to the action. PO is an important defensive statistic for evaluating a player's performance, especially for those who play positions like first baseman or catcher.