One might say that pi was created when the universe was created. Ancient people have knew that there was a constant ratio between the diameter and circumference of a circle and knew it was close to three. Better approximations were made as mathematics developed. The name of pi for this ration was not used until around 1700.
The first Raspberry Pi was released in February of 2012.
Pi Studios was created in 2002.
Pi Recordings was created in 2001.
Pi Delta Kappa was created in 1907.
Life of Pi was created in 2001-09.
Sigma Pi Phi was created in 1904.
Delta Sigma Pi was created on 1907-11-07.
Pi was created by Ancient Egyptians in 1706. Hope that helps! (:
Omega Pi was created on 1985-04-20.
Delta Gamma Pi was created in 1998.
Pi Lambda Phi was created in 1895.
Epsilon Tau Pi was created in 1999.