The term 'Italian Sub Layer' refers to a type of sandwich that is made with SALAMI. SALAMI is a type of cured meat that is made from pork, beef, or other meats and is usually seasoned with garlic, salt, and spices. It is a popular ingredient in Italian cuisine and is often used in sandwiches, such as the Italian Sub Layer. The word SALAMI is derived from the Italian word salame, which means 'salt-cured meat'.