Funny you should ask, a few weeks back i was working with a WH thats been officiating for 30 years. He faced the press box and made three downward movements with his arm (just like when kids back the gesture to truckers to blow their horn), signal the side of the team, and gestured the incomplete/declined signal. I asked him after the game and he said thats the signal to notify game administration that the team is out of timeouts for the half.
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