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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.
nounWord forms: plural pis. 1. the 16th letter in the Greek alphabet (Ï, Ï), a consonant, transliterated as p. 2. mathematics. a transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter.