The term 'Yellow Metallic Element' is referring to the element GOLD, which has a 4 letter symbol of Au. GOLD is a chemical element with the symbol Au and atomic number 79. It is a bright yellow, dense, soft, malleable, and ductile metal. GOLD is one of the few elements that occur naturally in its pure form and is found in nature as nuggets or grains in rocks, in veins and in alluvial deposits. GOLD is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history.