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A hockey stick is a piece of sport equipment used by the players in all the forms of hockey to move the ball or puck (as appropriate to the type of hockey) either to push, pull, hit, strike, flick, steer, launch or stop the ball/puck during play with the objective being to move the ball/puck around the playing area using the stick, and then trying to score.
The word Stick is a very generic term for the equipment since the different disciplines of hockey require significant differences in both the form and the size of the stick used for it to be effective in the different sports. Field/Ice/Roller hockey all have a visually similar form of stick with a long shaft or handle which can be held with two hands, and a curved and flattened end; the end and curvature of these sticks are generally the most visible differences between the sticks for these sports. A modern underwater hockey stick bears little resemblance to any field/ice/roller hockey stick since it massively smaller to enable it to be used exclusively in one hand, and it also has to be produced in one of two colours in order to identify which of the competing teams a player is playing for.