phi

First of all, why Phi? The mathematical symbol for Phi “π” is a Greek letter, derived from the first letter of the Greek words “περιφέρεια”, meaning periphery, and “περίμετρος”, meaning perimeter. The earliest known use of symbols was by the Welsh mathematician William Outright in 1647, but was only popularized in 1748 by Leonhard Euler in his … Read more