Question: what are the hand signals in basketball?
Answer: Referees Hand SignalsPrepared by: Fritzie B. Talidano MPE.
• Violation- raise arm with open palm. • ... 
Blocking- signal foul, hands on hips.
Charging-clenched fist.
Double Foul- waving clenched fist.
Holding-signal foul; grasp wrist.
Illegal Dribble- patting motion.
Illegal Use of Hands- signal foul, strike wrist.