Psi

Ψ

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).

1. It has come to be a symbol for (para)-psychology-related topics, and has also been used as a shorthand for supposed psychic or psionic abilities or powers.

• http://en.wikipedia.org/wiki/Psi

Related: Jabber, 23