2
: any of various devices operated with a button that makes a click sound when pressed
He pointed his clicker at the screen and the first slide appeared.—Larissa MacFarquhar
especially
: a mechanical handheld counter with a button that makes a click sound when pressed and that tallies the number of clicks
To help me keep count, I have a clicker inside my jacket pocket, the same kind baseball managers use to track pitch counts. —Colin Kearns
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Merriam-Webster unabridged
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