The use of the Greek letter π {\displaystyle \pi } to denote the ratio of a circle's circumference to its diameter was also popularized by Euler (although it did not originate with him).
Folosirea literei grecești π (pi) pentru raportul dintre circumferința unui cerc si diametrul său a fost de asemenea popularizată de Euler, chiar dacă ideea nu a pornit de la el.