The player responsible for discussing interpretations of the rules with the on-ice officials. He is often seen as the team leader on and off the ice. A captain can be recognized by the "C" on the front of their jersey.
In rare occasions teams have chosen to not have a captian and only choose alternate captains.
A goalie cannot wear a "C" nor have captain's privelges, however, the Vancouver Canucks selected Roberto Luongo as captain in 2008 to the beginning of the 2010 season as a symbolic gesture that baffled many fans.