Psi

Psi (Ψ ψ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. It is also used as a symbol/icon for psychology.

It is perhaps most famous in science for representing a wavefunction in quantum mechanics, particularly with the Schrödinger equation.

Psi is also used as the symbol for the polygamma function, defined by

where Γ(x) is the gamma function.

Greek alphabet
Α α Alpha Β β Beta Γ γ Gamma
Δ δ Delta Ε ε Epsilon Ζ ζ Zeta
Η η Eta Θ θ Theta Ι ι Iota
Κ κ Kappa Λ λ Lambda Μ μ Mu
Ν ν Nu Ξ ξ Xi Ο ο Omicron
Π π Pi Ρ ρ Rho Σ σ Sigma
Τ τ Tau Υ υ Upsilon Φ φ Phi
Χ χ Chi Ψ ψ Psi Ω ω Omega

Mycenaean Psi figurines

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