The term FOIL MATERIAL can be solved with the three-letter word TIN. TIN is a chemical element with the symbol Sn and atomic number 50. It is a malleable, ductile, and highly crystalline silvery-white metal. TIN is most commonly used in alloys, such as pewter and bronze, and is also used to coat other metals to prevent corrosion. TIN foil is a thin sheet of TIN that is used for various purposes, including cooking, wrapping food, and insulation.