+**Psi** (Ψ, ψ) is the 23rd letter of the [Greek](/wiki/greek) alphabet. It is widely used in science, symbolizing various concepts from wave functions in [physics](/wiki/physics) to the study of psychic phenomena in parapsychology. When referring to the latter, Psi encompasses abilities or influences of the mind beyond normal sensory perception.
+## See also
+- [Telepathy](/wiki/telepathy)
+- [Clairvoyance](/wiki/clairvoyance)
+- [Psychokinesis](/wiki/psychokinesis)
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