Your fellow golfers will be suitably impressed. You may also tell them as you pick the ball from the cup that Pi (?) is the ratio of a circle’s circumference to its diameter and a constant number, meaning that for all circles of any size, Pi will be the same. (They will most definitely tell you hurry up and get back in the cart)The Greek symbol for P was first used to represent Pi in 1706 3.14159. Our Pi symbols come in two styles per pack, one a stand alone letter, the other on a circular background. Total 16 of each symbol per pack.