Psi

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

This disambiguation page lists articles associated with the title Psi.
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