This is how the Texas School for the Deaf's Football team does their snap count
 

Thought this was neat and you might enjoy learning something new.

<blockquote class="reddit-card" data-card-created="1617699198"><a href="https://www.reddit.com/r/sports/comments/mkntrg/this_is_how_the_texas_school_for_the_deafs/">This is how the Texas School for the Deaf's Football team does their snap count</a> from <a href="http://www.reddit.com/r/sports">r/sports</a></blockquote>
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I guess. But if they are deaf, how can they hear the drum? They feel it, like a pulse?

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Get pumped up!

I know that's how KSD did theirs in the late 80's

Yes. It's the vibrations the drum causes. Although I've seen plenty of roughing penalties because it's damn near impossible to signal the play is over unless the ball carrier is on the ground.