Π π
From LSJ
νύκτα οὖν ἡμέραν ποιούμενος → without delay, as soon as possible, as fast as possible, making the night day, making night into day, turning night into day
English (LSJ)
πεῖ, IG22.2783.23 (iv B. C.), BCH29.483 (Delos), Hellad. ap. Phot.p.530B., indecl.: seventeenth (later sixteenth) letter of the Gr. alphabet: as numeral π = 80, but π' = 80,000.