There are many hand signals in volleyball. There are the kind that are used by the players and those used by the officials. The signals used by the players and coaches will vary from team to team.
The officials signals are used to signal when to begin a match, when to serve, when the play is over, who earned the serve and point, how the play was won or lost and when the game and match are over.
A good source of referree signals is USA Volleyball's VolleyballRefTraining.com website which includes loads of great resources for rules, regulations and how the game is officiated in the US.
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