Boarding
Violently checking an opponent into boards.
Delay Of Game
Imposed when a player or goalkeeper purposely delays the game in any way. For example, intentionally knocking the net off or clearing the puck over the glass in the defensive zone. If the net is deliberately displaced during a breakaway the opposing team is awarded a penalty shot. 
Hooking
The act of using the stick in a manner that enables a player or goaltender to restrain an opponent. For hooking to be called a player must impede the forward progress of an opposing player by hooking him/her with the blade of the stick.
Slashing
The act of a player or goalkeeper swinging his stick at an opponent, whether contact is made or not. Any forceful or powerful chop with the stick on an opponent’s body, the opponent’s stick, or on or near the opponent’s hands. 
Tripping
A player that places his stick or any part of his body on an opposing player in a manner that causes the opponent to trip or fall. Tripping will not result in a penalty if the player makes contact with the puck first and then tripped his opponent.