Umbral calculus

Umbral calculus is a type of mathematics that uses a special symbol (called an umbra) to represent numbers. This symbol is usually a letter with a line or a dot above or below it. The umbra lets us keep track of how many times a number is used in math equations. For example, if you add 3 and 7, we can use an umbra to represent the answer. We would write 3 + 7 = 𝝰. The umbra stands for 10, which is the answer to the addition problem.