The Ref Signals
THE REF'S SIGNALS Boarding 
Called when a player is hit or tripped from behind sending him into the boards.
Charging
Called for running or jumping into opponent. Usually takes 3 or more strides.
Cross Checking
Called when a player delivers a check with both hands on his stick and no part of the stick is on the ice.
Elbowing
Called when a player uses his elbow to strike another player. (Usually to the head).
High Sticking
Called when a player holds his stick above the waist of an opponent & contact is made.
Holding
Called when a player holds an opponent's body, uniform or stick with his hands
Hooking
Called when a player impedes an opponent's progress by using his stick.
Interference
Called when a player impedes an opponent's progress but neither player has the puck.
Misconduct
Called when a player abuses a referee or argues his ruling.
Roughing
Called for player(s) guilty of unnecessary roughness from pushing or shoving.
Slashing
Called when a player swings and strikes another player. Can be a major if there is an injury.
Spearing
Called when a player stabs an opponent with the point of stick blade. Usually a major penalty.
Tripping
Called when a player uses his stick, knee or foot in a manner that causes his opponent to fall.
Washout
When a linesman signals this, it means no icing or off-sides. A referee uses this to signal no goal.