# Difference between revisions of "Psi"

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'''Ψ''' | '''Ψ''' | ||

− | # The twenty-third letter of the | + | # The twenty-third letter of the [http://en.wiktionary.org/wiki/Classical_Greek Classical Greek] and [http://en.wiktionary.org/wiki/Modern_Greek Modern Greek], the twenty-forth letter of [http://en.wiktionary.org/wiki/Old_Greek Old Greek] and [http://en.wiktionary.org/wiki/Ancient_Greek Ancient Greek] Alphabet. |

#In mathematics (Ѱ, ѱ) is the angle between the tangent and the x-axis in the intrinsic coordinates system. | #In mathematics (Ѱ, ѱ) is the angle between the tangent and the x-axis in the intrinsic coordinates system. |

## Revision as of 10:20, 28 June 2005

**Ψ**

- The twenty-third letter of the Classical Greek and Modern Greek, the twenty-forth letter of Old Greek and Ancient Greek Alphabet.

- In mathematics (Ѱ, ѱ) is the angle between the tangent and the x-axis in the intrinsic coordinates system.

- The lower-case letter ψ is used as the symbol for the wave function in quantum mechanics.

- In high-energy physics, Ψ refers to a meson also called the J/Ψ particle

- Psi is also a popular Jabber client.

- Psi was also a character on the popular game and television series, Pokémon.

- The Italian Socialist Party (Partito Socialista Italiano)

- Pounds per square inch (PSI).