👉 The term "cotillions" is not commonly used or recognized in mathematics, and it may be a misnomer. The concept of a cotillion (or cotillion number) is often associated with the ancient Babylonian numeral system known as the Babylonian Cubic System, which was developed by Babylonians around 2000 BCE. The term "cotillions" refers to an infinite sequence or series of numbers that are not merely the product of two natural numbers but also can be expressed