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Psi facts for kids

Kids Encyclopedia Facts

Psi could mean:

As a word

  • Psi (Cyrillic) (Ѱ, ѱ), a letter of the early Cyrillic alphabet, adopted from Greek
  • Psi (Ψ, ψ) a letter of the Greek alphabet
  • Psi (comics), a character in DC Comics
  • Psi (instant messaging client), a popular Jabber client program
  • Psi (parapsychology)

As a Greek letter

  • J/ψ particle, a subatomic particle
  • Wavefunction in Quantum Mechanics, ψ
  • In mathematics, Ψ is used to denote the angle between the tangent and the x-axis in the intrinsic coordinates system
  • Again in mathematics, Ψ is also used to denote the Digamma and Polygamma functions.
  • In physical chemistry, Ψ represents water potential, the potential energy of a water solution relative to pure water.
  • Ψ stands for psychology and psychologist, often used in the logo of various psychological associations -- for example, see IUPsyS.


  • Pounds per square inch, a unit of pressure

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Psi Facts for Kids. Kiddle Encyclopedia.