Wikipedia: Psi

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Psi is the 23rd letter of the Greek alphabet. 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.

Psi is the 23rd letter of the Greek alphabet. 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.

(In StarCraft) the psychic powers of the Protoss race.

Psi is the 23rd letter of the Greek alphabet. 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.

(In StarCraft) the psychic powers of the Protoss race.