What is the method to end a time-out when multiple courts are in use?

The method to end a time-out when multiple courts are in use is through the use of a whistle. This is a standardized signal that is easily recognizable and ensures that all participants across the different courts are alerted simultaneously. Whistles provide a clear and distinct auditory cue that transcends any visual distractions or varying interpretations that might occur, especially in a bustling gym environment where multiple games are taking place.

While hand signals and scoreboard indications can also convey information, they may not be as universally acknowledged or as immediate for all players across courts. The referee's discretion is important for many aspects of officiating, but in this specific case of signaling the end of a timeout, a whistle is the most effective method to guarantee clarity and uniform response from players and coaches alike.