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#Psi (Ψ ψ) is a letter of the Greek alphabet. See Psi (letter).
  1. 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.
  2. See also PSI (pounds per square inch).
  3. Psi was also a character on the popular game and television series, Pokémon.
  4. The lower-case letter ψ is used as the symbol for the wave function in quantum mechanics.
  5. Psi is also an open-source instant messenger. See Psi (software).
  6. In high-energy physics, Ψ refers to a meson also called the J/Ψ particle
  7. PSI stands for the Paul Scherrer Institute in Villigen , Switzerland

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