Psi

Psi (Ψ ψ) is the 23rd letter of the Greek alphabet and has a numeric value of 700.

It has come to be a symbol for psychology-related topics, and has also been used as a shorthand for supposed psychic abilities or powers.

See also PSI (pounds per square inch).

Psi was also a character on the formerly popular game & television series, pokemon

See also:

• Alpha - Beta - Gamma - Delta - Epsilon - Digamma - Zeta - Eta - Theta - Iota - Kappa - Lambda - Mu - Nu - Xi - Omicron - Pi - San - Qoppa - Rho - Sigma - Tau - Upsilon - Phi - Chi - Psi - Omega - Sampi