The black dot on the palm indicates that the person is in trouble and needs help. The black dot on the palm is a distress signal. If you see this black spot, you must call the police. International common way of asking for help: fire signal The international common fire signal is to set three fires. The semaphore means that a flag or a piece of brightly colored cloth is tied to a stick. When swinging, the left side is long and the right side is short, making a figure-eight action. If the two sides are close, you don't need to do the eight-character action, just draw it briefly, once on the left and once on the right. The former takes a little longer than the latter.
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