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This cannot rigorously be described as sigma-pi conjugation since sigma and pi here refer to different defining planes, and interaction between orbitals of different symmetries (with respect to the same defining plane) is forbidden.
Pi (Ï). Definition: Pi is a number-approximately 3.142. It is the circumference of any circle divided by its diameter. The number Pi, denoted by the Greek letter Ï - pronounced 'pie', is one of the most common constants in all of mathematics. It is the circumference of any circle, divided by its diameter. Nobody knows its exact value, because no matter how many digits you calculate it to, the number never ends.