The term 'Taco Exterior' refers to the outer layer of a taco, which is commonly referred to as the SHELL. The SHELL is usually made from a flatbread or tortilla and is filled with various ingredients such as meat, cheese, vegetables, and sauces. The SHELL is then folded or rolled up to form the taco. The taco exterior is an important part of the overall taco experience, as it provides a crunchy texture and holds all the other ingredients together.