Pi  (/paɪ/; uppercase Π, lowercase π and ϖ; Greek: πι [pi]) is the sixteenth letter of the Greek alphabet, representing the sound [p].

In the system of Greek numerals it has a value of 80. It was derived from the Phoenician Letter PE.

The first recorded use of π as a mathematical symbol comes from the Welsh mathematician William Jones in a 1706 work called Synopsis Palmariorum Matheseos, in which he abbreviated the Greek περιϕέρεια, (meaning “circumference,” or “periphery”) to its first letter: π

Greek letter, from Phoenician, deriving from an earlier sign for "mouth" or to communicate.

In microeconomics lowercase  π  denotes profit.  

Real Estate is a people business with positive outcomes being achieved from successful communication and the ability to take people on the journey with you.