silver sheet

Meanings

1. A thin sheet of silver, e.g. used in metalworking or jewellery.
2. A cinema screen onto which movies are projected.
3. By extension, movies, the film industry, or that which is related to movies or cinema (often preceded with "the")

Etymology

Cinematic senses derive from late 19th and early 20th century cinema screens which in some cases had a coating of reflective metallic paint, known as silver screens or silver sheets.