Psi (Ѱ, ѱ) is a letter in the early Cyrillic alphabet, derived from the Greek letter of the same name; (Ψ, ψ) see Psi (letter). It was used in Russian until 1708. Psi makes the ps sound, (naps), not (psychic). In psychic "ps" makes the s, ss, or ſ sound.
See also
Psi, for other meanings.
