What is a 'call' in theater practice?

In theater practice, a 'call' refers to a signal or command that prompts an actor to enter the stage or to be ready for a specific action. This term is typically used in rehearsal and performance contexts to ensure precise timing and coordination among the cast and crew. When an actor receives a call, it serves as a cue for them to make their entrance, ensuring that the flow of the performance remains smooth and organized.

While the other options involve important aspects of theater, they do not define 'call' as accurately. For instance, requests for lighting adjustments or demands for silence are part of the broader operational dialogue within a production, but they do not pertain specifically to actor entrances. A call is inherently related to the actions of performers, making it crucial to the rhythm and timing of a live theater production.