Iota is the ninth letter in the Greek alphabet. It is a small letter that looks like a point or a tiny quantity.' IOTA is a Greek letter that is the ninth letter in the alphabet. It is represented by a small letter that looks like a point or a tiny quantity. IOTA is used in many different contexts, including mathematics, science, and philosophy. In mathematics, it is often used to represent a very small number or fraction. In science, it is used to represent a very small amount of energy or mass. In philosophy, it is used to represent a concept or idea that is very small or insignificant.