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Psi or PSI or Ψ may refer to:

Alphabetic letters[edit]

  • Psi (letter) (Ψ, ψ), 23rd letter of the Greek alphabet
  • Psi (Cyrillic) (Ѱ, ѱ), a letter of the early Cyrillic alphabet, adopted from Greek

In arts and entertainment[edit]

In comics[edit]

In music[edit]

  • PSI (album), an album by Pitchshifter
  • Psi Com, a 1980s rock band
  • Psi Power, a 1978 song by the UK rock group Hawkwind
  • PSI Records, a music record label
  • Ψ CMX DVD, a Finnish language video album by the band CMX
  • Pitch Shifter Industries, an acronym used by the British band Pitchshifter

Other uses in arts and entertainment[edit]

In mathematics[edit]

In parapsychology[edit]

In science and technology[edit]

In biology and medicine[edit]

In computing[edit]

In physics and chemistry[edit]

In psychology[edit]

  • Psychology or psychologist, denoted Ψ, used in the logo of various psychological associations
  • Psi Chi, the National Honor Society in Psychology
  • Psi-Theory, a theory about the human mind, a cognitive architecture
  • Psychiatric Solutions, Inc., a corporation that owns psychiatric hospitals

Other uses in science and technology[edit]


In education[edit]

In government and politics[edit]

Other organizations[edit]

Other uses[edit]

See also[edit]