Arithmancy is the study of the magical properties of numbers, including predicting the future.
Arithmancy is an ancient field of study. At Hogwarts School of Witchcraft and Wizardry, students are able to choose to begin the study of Arithmancy in their third year. “Numerology and Grammatica” and “New Theory of Numerology” are two popular books on Arithmancy.
From the Greek words “arithmos” which means number, and “manteia” which means divination.