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In North America or Northern Europe a beckoning sign is made with the index finger sticking out of the clenched fist, palm facing the gesturer. finger moves repeatedly towards the gesturer (in a hook) as to draw. — “List of gestures - Wikipedia, the free encyclopedia”, en.wikipedia.org
The index and middle fingers are kept together (touching) and the back of the hand faces outwards (away from the gesturer). The gesture refers to the act of inserting the index and middle fingers into a vagina and the little finger into the unwitting receiver's anus, hence the "shock". — “Shocker (hand gesture) - Wikipedia, the free encyclopedia”, en.wikipedia.org
The AMEX is the only U.S. stock market to permit the transmission of buy and sell orders through hand signals. Signals that occur with palms facing out and hands away from the body are an indication the gesturer wishes to sell. — “Hand signaling (open outcry) - Wikipedia, the free encyclopedia”, en.wikipedia.org