When the umpire's fist is up and then out away from his body in a hammering motion, he is signifying:

• A. That he is "chopping" the clock to indicate the time-out is completed.
• B. The offending coach is making threatening gestures.
• C. Celebrating a great play made by the catcher.
• D. A strike or an out.

Answer: (D)

The hammering signal with a fist raised then driven outward is how the umpire communicates a strike or a strikeout. The raised fist marks the call is about a pitch, and the quick outward hammering motion clearly conveys the result to everyone on the field—that the pitch was a strike, which can also result in an out if the batter is ruled out on strikes. This gesture provides a loud, unmistakable cue to the batter, catcher, and defense that the pitch placement or outcome met the strike criteria.

Other options aren’t consistent with this signal. It isn’t used to indicate a time-out completion, it isn’t a gesture used to address threatening behavior, and it isn’t a celebration of a catcher’s play. The hammering signal is specifically tied to the pitch result being a strike (and thus an out if applicable).