"Psi has multiple meanings:

• Psi (letter) (Ψ, ψ) of the Greek alphabet
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• Psi (Cyrillic) (Ѱ, ѱ), letter of the early Cyrillic alphabet, adopted from Greek
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• Psi (instant messenger) software
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• Psi is supposed psychic or psionic powers in parapsychology
• Psi, a character in the game and television series Pokémon
• Schrödinger equation in quantum mechanics, ψ
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• J/ψ particle, a subatomic particle
• Ψ in mathematics is the angle between the tangent and the x-axis in the intrinsic coordinates system"

• From Wikipedia, the free encyclopedia.

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• ψ