Which term describes the part of the game where players signal for a substitution?

The term that correctly describes the part of the game where players signal for a substitution is "substitution request." This term is widely used in volleyball to refer specifically to the action taken by a player or coach to notify the officials that a substitution is intended. When players wish to come off the court or when a new player is brought in, this request is typically communicated through a clear signal, allowing the officials to acknowledge and process the change in players.

This terminology emphasizes the formal nature of the substitution process within the rules of the game, indicating the step where communication between players and referees occurs. Understanding this term is essential for players, coaches, and officials to ensure that substitutions are conducted smoothly and within the regulations of the sport.