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You'll often see officials signal a "30" or pat themselves on the chest as an additional (although unnecessary, and technically incorrect) signal. I'm not recommending those, just saying you'll see them in common usage. If the reason you're stopping the game is obvious, nobody's watching you anyway. So a whistle and stop clock is quite sufficient.
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"It is not enough to do your best; you must know what to do, and then do your best." - W. Edwards Deming
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