<P> The National Hockey League (NHL) is a professional ice hockey league composed of 31 teams, founded in 1917 . Each team may select a captain, who has the "privilege of discussing with the referee any questions relating to interpretation of rules which may arise during the progress of a game ." Each team is also permitted to select alternate captains, who serve when the captain is not on the ice . Captains are required to wear the letter "C" on their uniform for identification while alternate captains wear the letter "A"; both letters are 3 inches (7.6 cm) in height . </P> <P> Rule 6.2 of the 2008--09 Official NHL Rulebook indicates that "(only) when the captain is not in uniform, the coach shall have the right to designate three alternate captains . This must be done prior to the start of the game ." Many NHL teams with a named captain select more than two alternate captains and rotate the "A" among these players throughout the season . There are currently seven teams without captains: the Arizona Coyotes, the Buffalo Sabres, the New York Islanders, the New York Rangers, the Toronto Maple Leafs, the Vancouver Canucks, and the Vegas Golden Knights . </P> <P> Goaltenders are not permitted to serve as captains during games . This rule was instituted in 1948 after teams complained that it took Montreal Canadiens goaltender Bill Durnan too long to skate to talk with the officials and back to his crease . Vancouver Canucks goaltender Roberto Luongo served as captain for two seasons (2008--09 and 2009--10), but because of the League's rule, he was not allowed to serve as captain on - ice or wear the "C" on his jersey, though it was incorporated into the artwork on his mask . As a result, the Canucks were allowed to dress three alternate captains in games, as opposed to the League standard of two . Two (of the three) alternate captains handled on - ice duties in Luongo's place . Other than Durnan and Luongo, five other goaltenders have captained their team: John Ross Roach of the Toronto St. Patricks, George Hainsworth of the Montreal Canadiens, Roy Worters of the New York Americans, Alec Connell of the original Ottawa Senators and Charlie Gardiner of the Chicago Black Hawks . </P>

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