Prop (noun)

1. An object used in a stage production to support or enhance the setting or action of a scene.
2. An object or device used to support something.
3. A piece of equipment or machinery used as a support or aid in a specific activity or operation.

Origin:

Shortened form of property.

Examples:

1. The prop department had a hard time finding the right sword for the play.
2. He leaned against the wall for support, it was a prop.
3. The actor used a prop to help him walk like an old man.
4. The company uses various props for their presentations.
5. The photographer used a prop to enhance the composition of the photo.