They use a series of hand signals. Here are a few examples:
COMMUNICATION WITH PLAYERS:
Raising right hand straight above his head - If the misconduct of the player is enough to apply the rule 16.8. The umpire would perform this hand signal and call the name of the player, warning for misconduct.
These are some of the hand signals followed by the service judges:
Raise the right arm in front - The service judge would raise his right arm slightly, flex the elbow and keep the palm vertically facing the opposite direction. The service judge performs this signals to indicate that the shaft of the racket when hitting the shuttle was not below the level of the wrist. This signal can also be applied to reveal that while serving the racket and/or the shaft of the racket was not facing downwards when hitting.
Lift the palm horizontally facing downwards - The signal is made below the level of abdomen followed by moving the palm left and right. This signal conveys that the shuttle, was not hit under the level of the waist during serving.
Extend the right leg and pointing the hand towards the foot - This hand signal indicates that either one or both feet were not in the service court till the serve was completed.
Im not too sure with how officials communicate with other officials, but i believe they use similar hand signals as they do with players.
Hope this helped :)
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The referee makes sure all the players are following each of the rules in Basketball. Like traveling, double dribble, pushing foul, and many more.
Basketballs, whistles, and a uniform that is usually black slacks with a black and white striped shirt. Some basketball officials also like to keep a copy of the rule book handy.