These are the referees' official hand signals when they are officiating a game of beach volleyball. If you want more detailed information, the full beach volleyball rule book can be found here.
Point Awarded
Whenever a team successfully scores a point, the referee lifts their hand in that direction.
Ball in
Whenever the ball lands inside of the lines on the edge of the court, or touches the lines, the referee points the arm and fingers toward the floor.
Ball Out
Whenever the ball lands completely outside of the boundary lines, touches the antennae or another illegal object, the referee raises the forearms vertically, hands open, palms towards the body.
Catch
If the ball is caught and/or thrown, the referee slowly lifts the forearm, palm of the hand facing upwards.
Double Contact
If a player hits the ball two times consecutively, not including off of a block, the referee raises two fingers, spread open
Four Hits
If a team hits the ball four times before returning it, the referee raises four fingers, spread open.
Net Touched by Player
If a player touches the net during play, the referee indicates the relevant side of the net with the
corresponding hand
Reaching Beyond the Net
If a player touches the ball or an opponent in the opponent’s space before or during the opponent’s attack hit, the referee, places a hand above the net, palm facing downwards.
Ball Touched
If the ball touches a player and subsequently lands on the ground on their side of the court,the referee brushes with the palm of one hand the fingers of the other, held vertically.
Double Fault and Replay
If two or more faults are committed by opponents simultaneously, a double fault is called and the rally is replayed, signaled by the ref raising both thumbs vertically.
Delay Warning
If a team performs an improper action that defers resumption of the game, the referee covers their wrist with a yellow card.
Delay Penalty
If a team performs an improper action that defers resumption of the game twice or more in one match, the referee covers their wrist with a red card and a point and service are given to the opponent.
Misconduct Warning
If a team member performs incorrect conduct towards officials, opponents, teammates or spectators, they are shown a yellow card as a warning.
Misconduct Penalty
The first rude conduct in the match by any team member is penalized with a point and service to the opponent. The referee signals this by showing a red card.
Expulsion
The first offensive conduct by a team member, or the second rude conduct, is sanctioned by expulsion with no other consequences. The referee signals by showing both cards jointly.
Disqualification
The first physical attack or implied or threatened aggression, or the second offensive conduct by a team member, or the third rude conduct, is sanctioned by expulsion with no other consequences. The referee signals by showing red and yellow cards separately.
End of Set or Match
When a team wins 21 points in a set with a minimum of a 2 point lead, or 2 sets, the referee crosses the forearms in front of the chest, hands open.
Ball Not Tossed or Released at the Service Hit
If the ball is not hit with one hand or any part of the arm after being tossed or released from the
hand, the referee lifts the extended arm, the palm of the hand facing upwards.
Delay in Service
If the server does not hit the ball within 5 seconds after the referee whistles for service, the referee raises five fingers, spread open.
Blocking Fault
If a player makes a blocking fault, the referee raises both arms vertically, palms forward.
Service Order Fault
A service order fault is committed when the service is not made according to the service order, the referee signals by making a circular motion with the forefinger.