bat
Piece of wood that the batter uses to hit the ball; its maximum length is 42 inches.
crest 
Symbol representing the brand of the bat or its manufacturer.
hitting area 
The widest part of the bat and the part that strikes the ball; it must not exceed 2.75 inches in diameter.
handle 
The narrowest part of the bat that the player grasps; it is sometimes covered with antislip material.
knob 
Circular piece on the end of the handle; it prevents the hand from slipping off the bat.