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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.
More About Pi. 1  The 16th letter of the Greek alphabet. 2  It is symbolically represented as Ï. 3  The value of pi is or approximately equal to 3.14159.  Pi is an irrational number.