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Iirc, the Fed changed this signal to use the fists just within the last few years. Rationale being that it's a "stronger" looking signal. As long as it's out where it should be, I don't see how it could be confused for the intentional signal (which doesn't mean that it can't happen).
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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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