Psi, PSI or Ψ may refer to:

Alphabetic letters

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

Arts and entertainment

Comics

Music

Other uses in arts and entertainment

Organizations

Government and politics

Other organizations

Parapsychology

Science, technology, and mathematics

Biology and medicine

Computing

Economics

Engineering

Geography

Mathematics

Physics and chemistry

Psychology

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

Other uses

See also

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