Ψψ Psi is a letter in the Greek alphabet of Earth, originating in the early period of Human history.
It was used in the following contexts:
- Medical terminology
- Psi-wave pattern
- Astronomical nomenclature
- Psi 2000
- Psi Cancri, a star system
- Psi Epsilon III, a planet
- Psi Octantis, a star system
- Psi Serpentis, a star system
- Psi Epsilon IV, a planet
- Psi Upsilon III, a planet
- Psi Upsilon IV, a planet
- See also