Psi
Medical terminology
 Psi-wave pattern
 Psi-wave device

Astronomical nomenclature
 Psi 2000
 Psi 2000 personnel
 Psi Cancri, a star system
 Psi Epsilon III, a planet
 Psi Epsilon IV, a planet
 Psi Upsilon III, a planet
 Psi Upsilon IV, a planet

See also
 PSI

fr:Psi