The term METAL DISC can be broken down into two crossword solutions: GONG (4 letters) and PATEN (5 letters). A GONG is a metal disc that is struck with a mallet to produce a sound. It is often used in religious ceremonies or as a signal for important events. A paten is a metal disc that is used in Christian churches to hold the bread during communion. It is usually made of gold, silver, or brass and is often decorated with symbols or engravings.