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Originally Posted by NCASAUmp
It's not in the ASA book. However, it's one of those hand signals that everyone "knows."
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Besides being important for umpires to know whne IFR applies, it is very reassuring to know that your partner is aware of both on and off. The arm brushing seems most common for "off", but I have begun brushing my upper arm sleeve to be more visible and to avoid getting sweat and sun screen on my hands.
