Question: what are the referee hand signals in volleyball?
Answer: Authorization for Service. The beckon for serve is the most used signal by the first referee. ... 
Loss of Rally. Extend the arm on the side of the team that won the rally. ... 
Ball In. ... 
Ball Out. ... 
Ball Touched. ... 
Line Fault (Hand Signals Volleyball) ... 
Catch. ... 
Double Contact (Hand Signals Volleyball)