Rule 2 – Section 7 – BATTER, BATTER’S BOX, BATTER-RUNNER
2-7-1 The batter is the player of the team at bat who is entitled to occupy either of the two batters’ boxes as shown in Diagram 2.
2-7-2 The batter’s box is the 4 foot x 6 foot area in which the batter shall stand when batting. The lines are part of the box. (See Official Measurements in Diagram 2)
2-7-3 A batter-runner is a player who has finished a time at bat until he is put out or until playing action ends.