[Rich Ives]

There is a "Special Pinch Runner" rule.

7.14 Once each inning a team may utilize a player who is not in the batting order as a special pinch-runner for any offensive player. A player may only be removed for a special pinch runner one time during a game. The player for whom the pinch-runner runs is not subject to removal from the lineup. If the pinch runner remains in the game as a substitute defensive or offensive player, the player may not be used again as a pinch runner while in the batting order. However, if removed for another substitute that player or any player not in the line up, is again eligible to be used as a pinch runner.