Answer:
They are called stage directions
Step-by-step explanation:
Stage directions are notes in the script usually written in italics and enclosed in parentheses or brackets. They usually describe where and when a scene takes place (setting), how the characters should say their lines, and how the characters should move onstage. They may explain the character's mood or how the character is feeling.
Stage directions may also describe sets, costumes, props, lighting, and sound effects.
Stage directions use certain terms to describe the stage. Look at the following slide and see how.