Bigwhistle,
You are right on the money, as I was reading the replies, I kept thinking about our mechanics, Blow whistle, raise hand and point or give some sort of single. I think having something on the wrist or palm would get in the way. What about the official who makes the block call and sells it. I don't know about everyone else, but if I go to give the block signal with some authority, I have probably broke this device!
AK ref SE
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