A modern author's representation of the Triad (Priya Hemenway), as a triangle derived from the vesica piscis.
The Triad is a Pythagorean title for the number three. According to Priya Hemenway they considered it the most beautiful number, as it is the only number to equal the sum of all the terms below it, and the only number whose sum with those below equals the product of them and itself.[1]
