Psi

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), psychic or paranormal phenomena

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.

psi

• Pounds per square inch, a unit of pressure

This disambiguation page lists articles that are about something that can be called Psi. If an internal link led you here, you may wish to change the link to point directly to the article meant.