See Indoor Hand Signals

Authorization to serve
Move the hand to indicate the direction of service.

Team to Serve
Extend the arm to the side of the team that will serve.

Change of Courts
Raise the forearms front and back, and twist them around the body.

Place the palm of one hand over the fingers of the other, held vertically (forming a “T”), and then indicate the requesting team.

Circular motion of the forearms around each other

Show a yellow card for a warning; red card for a penalty.

Show both cards jointly for explosion.

Show red and yellow cards separately for disqualification.

End of Set or Match
Cross the forearms in front of the chest, hands open.

Ball not tossed or released at the service hit
Lift the extended arm, the palm of the hand facing upward.

Delay in Service
Raise eight fingers, spread open.

Blocking Fault or Screening
Raise both arms vertically, palms forward.

Positional or Rotation Fault
Make a circular motion with the forefinger.

Ball "in"
Point the arm and fingers toward the floor.

Ball "out"
Raise the forearms vertically, hands open, palms toward the body.

Slowly lift the forearm, palm of the hand facing upward.

Double Contact
Raise two fingers, spread open.

Four Hits
Raise four fingers, spread open.

Net touched by player; served ball fails to pass to the opponent through crossing space
Indicate the respective side of the net.

Reaching Beyond the Net
Place a hand above the net, palm facing downward.

Attack Hit Fault
Make a downward motion with the forearm, hand open.

Point to the court under the net or to the respective line.

Double Fault and Replay
Raise both thumbs vertically.

Ball Touched
Brush with the palm of one hand the fingers of the other; held vertically; USAV: Brush fingers of opposite hand once over palm of vertical hand.

Delay Warning/Delay Penalty
Cover the wrist with a yellow card (warning) and with a red card (penalty).

Ball in
Lines: Point down with flag.

Ball Out
Lines: Raise flag vertically.

Lines: Raise flag and touch the top with the palm of the free hand.

Ball out or server's foot fault.\
Wave flag over the head and point to the antenna or the respective line.

Judgment Impossible
Raise and cross both arms and hands in front of the chest.