Defence (defense in the U.S.A.) in hockey is a player position with a primary responsibility to prevent the opposing team from scoring goals. Defence players are often referred to as defencemen, D, or "Blueliners". In regular play there are two defence players and three forwards on the ice along with the goaltender. The greatest defenceman in NHL history is often considered to be Bobby Orr who surprisingly managed to win scoring titles while playing defence. Each year the NHL presents the Norris Trophy to the best defenceman in the league.