This is information written in the script of a play to tell actors where to go or how to speak their lines.

The term given to this information would be Stage Directions.

Explanation:

Stage Directions usually appear in italics in the script of a theater play. I is used for the actors and actresses of the play to know how to move, where to stand, how to look, who to look, what to watch, and every important detail for the actor or actress to develop their role in the most efficient and precise manner.

The answer is stage directions