Rule 2.00 STRIKE

STRIKE

A STRIKE is a legal pitch when so called by the umpire, which—
 
(a) Is struck at by the batter and is missed;
 
(b) Is not struck at, if any part of the ball passes through any part of the strike zone;

(c) Is fouled by the batter when he has less than two strikes;
 
(d) Is bunted foul;
 
(e) Touches the batter as he strikes at it;
 
(f) Touches the batter in flight in the strike zone; or
 
(g) Becomes a foul tip.


DISCUSSION
Simply holding the bat in the strike zone is not "striking at" the ball.