What is the proper way to signal a strike?

To signal a strike properly, the umpire makes a fist and raises one arm. This method is universally recognized in baseball and effectively communicates the call to players, coaches, and the spectators. The raising of the arm, coupled with the fist, provides a clear and definitive signal that distinguishes a strike from other calls. This action helps maintain the flow of the game and ensures that everyone is aware of the decision made regarding the pitch.

In contrast, raising both hands above the head is typically reserved for indicating a suspension or a timeout. Pointing towards the pitcher does not convey information about the pitch outcome and may lead to confusion. Shaking the head negatively generally signals a no call or disagreement rather than a specific pitch outcome. Therefore, making a fist and raising one arm is the standardized way to clearly signal a strike in baseball.