Monad of the term minimun, refers to an indivisible unity which constitutes the element of all things. This term for Yvonne Domenge, taught to her in her childhood by her father, philosopher, musician, lawyer. She appropriates this term and makes it her symbolic and spiritual primordial element. For Leibniz, (17th century) he designates the Monads as spiritual substances as simple components of the universe, i.e. "the monad is a spiritual atom, an indivisible substance. Each monad is different from the other, since in nature there are no identical beings."