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Fist for 11.
As an association, we agreed that thumbs were not easy enough to see.
Both hands with 5 fingers on the chest for 10-. One finger with 2 for 12+. Usually a verbal of some kind (calling out their names) to emphasize to the other officials.
John, the signals are for us. As long as the crew on the field knows and responds appropriately, why would you care?
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