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  1. The twenty-third letter of the [Classical Greek] and [Modern Greek], the twenty-forth letter of [Old Greek] and [Ancient Greek] Alphabet.
  1. In mathematics (Ѱ, ѱ) is the angle between the tangent and the x-axis in the intrinsic coordinates system.
  1. The lower-case letter ψ is used as the symbol for the wave function in quantum mechanics.
  1. In high-energy physics, Ψ refers to a meson also called the J/Ψ particle
  1. Psi is also a popular Jabber client.
  1. Psi was also a character on the popular game and television series, Pokémon.
  1. The Italian Socialist Party (Partito Socialista Italiano)
  1. Pounds per square inch (PSI).

Related: Jabber, 23