Psi, PSI or Ψ may refer to:

Alphabetic letters

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  • Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet
  • Psi (Cyrillic), letter of the early Cyrillic alphabet, adopted from Greek

Arts and entertainment

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Comics

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Music

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Other uses in arts and entertainment

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Organizations

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Government and politics

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Other organizations

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Parapsychology

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Science, technology, and mathematics

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Biology and medicine

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Computing

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Cryptography

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Economics

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Engineering

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Geography

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Mathematics

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Physics and chemistry

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Psychology

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  • 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

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See also

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