Why do volleyball officials use hand signals?

Answer 1

Whether you are a player, coach, scorekeeper, or spectator, learning the hand signals for volleyball is significant because you know what is called on the court, whether a ball is in or out, who receives each point. Also, there are often penalties to the respective teams, such as out of rotation or a foot fault.

Answer 2

to communicate why a certain point is being allotted to a team.