Psi

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Psi or the initials PSI or Ψ may refer to:

Alphabetic letters[edit]

  • Psi (letter) (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[edit]

Comics[edit]

Music[edit]

Other uses in arts and entertainment[edit]

Organizations[edit]

Government and politics[edit]

Other organizations[edit]

Parapsychology[edit]

Science, technology, and mathematics[edit]

Biology and medicine[edit]

Computing[edit]

Economics[edit]

  • PSI-20, stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal
  • Private sector involvement, in sovereign-debt restructuring deals

Engineering[edit]

  • "Yaw" angle, one of the Euler angles, denoted ψ in aerospace engineering

Geography[edit]

Mathematics[edit]

Physics and chemistry[edit]

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, theory about the human mind, a cognitive architecture
  • Psychiatric Solutions, Inc., corporation that owns psychiatric hospitals

Other uses[edit]

See also[edit]