Psi

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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).


 * http://en.wikipedia.org/wiki/Psi

Related: Jabber, 23