In baseball, umpires use a specific verbal call to signal a strike. When a pitch is thrown and is within the strike zone (i.e., it crosses over any part of the plate between the batter’s knees and their armpits), the umpire will make the following verbal call:
“STRIKE!”
The umpire will generally make the call loudly and clearly to ensure that everyone on the field and in the stands can hear it. In some cases, the umpire may use a more emphatic or animated call to signal a particularly impressive strike, such as a swinging strike or a strikeout.
In addition to the verbal call, umpires will also use hand signals to indicate a strike. The standard signal for a strike is to raise one arm straight up in the air with the fist closed, but different umpires may use slightly different hand signals depending on their personal style and preference.
Overall, the verbal call and hand signals used by umpires to signal a strike are an essential part of the game of baseball, as they help to ensure fair and accurate calling of the game and provide a clear and consistent framework for players, coaches, and fans.