In volleyball, some girls at the net will put a hand behind their back and hold up 1 finger or 2 fingers. 1 finger means that they are blocking line and 2 means that they are blocking cross court. Some with their other hand will hold up two or three fingers. Two means that there are only 2 hitters on the other side and that the setter is front row, which means she/he is able to dump. 3 means that there are 3 live hitters on the other team. Some setters will also signal to their hitters what hits they will run. Most teams make up their own hand signals for hits.
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In the game of Basketball, and at all levels, hand-signals are quite commonly used. While the officials who referee the games utilize hand-signals to denote violations of the rules, the players on each side will typically utilize many different hand-signals to communicate with each other. As just one example, a player who possesses the ball may raise a single finger into the air, thereby communicating to his or her teammates that they should run "play 1".
stepping- hands moving up and down
OBSTRUCTION- hand apart in front of body
PERSONAL CONTACT- open hands slap the other arm
HELD BALL- any three fingers held up
TOSS-UP- palm of hand moved vertically upwards
HOLD TIME- make a T with the fingers of one hand against the palm of the other
OFFSIDE- semi-circular action of one arm
OVER A THIRD- semi-circular action of one arm
GOAL SCORED - arm raised high as whistle is blown
there are many, when the umpire move there hands in a up and down movement that means stepping, when they make a cross with there hand it means contact, when they place there hand in one way and another the other way it mean that the ball it taken from there and given to the player that there arms are facing.
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