The term 'theater curtain fabric' can be summarized by the word 'SCRIM, ' which is a five-letter word. SCRIM is a lightweight, open-weave fabric that is often used for theater curtains. It is made of cotton, linen, or synthetic fibers and is designed to allow light to pass through while still providing some degree of opacity. SCRIM is also used in photography and filmmaking to create special lighting effects.