Pi (letter)
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Pi is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive IPA:. In the system of Greek numerals it has a value of 80. It was derived from the Phoenician letter Pe.
Coin of the Boeotian League minted c. 364–362 BC by Epaminondas (EΠ-AMI), with archaic form of pi.
Sigma
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Sigma is the eighteenth letter of the Greek alphabet. When it is used at the end of a letter-case word, the final form is used. In Ὀδυσσεύς, for example, the two lowercase sigmas in the center of the
Pi (letter)
…In science and engineering: The product operator in mathematics, indicated with capital pi notation Π (in analogy to the use of the capital Sigma Σ as summation symbol). The osmotic pressure in chemistry…
A plaque reading "Metochion of Gethsemane" (Μετόχιον Γεθσημανῆς) in Jerusalem, with a lunate sigma both at the end and in the middle of the word