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One arm held straight out sideways, marking an illegal delivery.
One arm extended horizontally signals a no-ball: the delivery was illegal, most often because the bowler overstepped the crease. A run is added, the ball is bowled again, and the batter cannot be out bowled or caught from it.
Signals a no-ball, adding one run and requiring the delivery to be bowled again. The Laws list the many ways a delivery can be illegal, of which overstepping the popping crease is the commonest.
Restricts how the batter can be dismissed from that delivery — bowled, caught, leg before wicket and stumped are all ruled out — which is why a batter may play at a no-ball with unusual freedom.
A standing figure with one arm extended horizontally to the side at shoulder height, forming a single straight line from shoulder to fingers.
One arm out is a no-ball; both arms out is a wide.