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The Greek capital letter Psi is often used to represent the word, or study of, Psychology.

For example:

Ψ = Psychology Ψist = Psychologist.

Ψ, in biological terms, is a symbol used to represent water potential.

Ψ, in astrology, is the symbol that represents Neptune.

Ψ, in physics, is the symbol used to represent the quantum-mechanical wave-function.


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