Foul tip
There is every reason in the world to give a foul tip signal on a caught ball -- especially if you have base runners stealing or just off base when it occurs. A foul tip imposes no tag up responsibilities on a runner, whereas a foul ball caught by the catcher (anything OTHER than a foul tip -- backwards line drive, pop up, whatever) imposes tag up responsibilities
Given that a strike call and an out call can look similar, the foul tip signal communicates that the ball is live and that no tag up responsibility exists.
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