Pi is the ratio of a circle's circumference to its diameter, a ratio which is the same for any sized circle.
The earliest approximations of Pi are found in Egypt and Babylon. Babylon on a clay tablet dated 1900-1600 BC and Egypt on the Rhind Papyrus dated around 1650 BC.
The cache is hidden near the small church of Ayios Georgios, which is accessible via a bumpy concrete track and a short piece of rough stoney track. If you have time, please wander around and take in the surrounding views. The church is usually open.
The cache is a small plastic container.