What is the signal for a "balk" in baseball?

The signal for a "balk" in baseball is for the umpire to extend one arm out to the side and make a backward motion. This signal is explicitly designed to communicate to players, coaches, and spectators that the pitcher has committed an illegal motion while on the mound, which can result in base runners being awarded advanced bases.

This action of making a backward motion is particularly clear and distinct, allowing everyone involved in the game to understand the infraction that has occurred. It helps maintain fair play by ensuring all participants are aware of the balk, which is crucial for the enforcement of the rules surrounding pitching mechanics.

The other signals mentioned do not represent a balk and would convey different actions or calls, underscoring the importance of recognizing specific signals in the context of a baseball game.