A penalty in ice hockey is a punishment for inappropriate behavior. Most penalties are enforce by detaining the offending player within a penalty box for a set number of minutes during which he can not participate in play. The offending team usually may not replace the player on the ice, leaving them short-handed (as opposed to full strength) or penalty killing until the penalty expires and the player returns to the ice. The opposing team is said to be on a power play, having one player more on the ice than the short-handed team. While standards vary somewhat between leagues, most leagues recognize several common degrees of penalty, as well as common infractions. The statistic used to track penalties was traditionally called Penalty Infraction Minutes (PIM), although the alternate term Penalties in Minutes has become common in recent years.