A prop is something an actor, whether In-Universe or Real Life, physically holds or interacts with in a production. Actors use props to connect their performances to reality which helps establish Willing Suspension of Disbelief for the audience.
Prop Cycle (Video Game) - TV Tropes
Last-Second Photo Failure - TV Tropes
Another / Characters - TV Tropes, another anime characters
Suggestion: Ninja Prop - TV Tropes Forum
Time Stands Still - TV Tropes
Die, Chair, Die! - TV Tropes
Proscenium Reveal - TV Tropes
Another / Characters - TV Tropes, another anime characters
Western Animation / Paper Thin Disguise - TV Tropes
TV Tropes Characters ― Perchance Generator