Psi

Psi could mean:

As a word[change | change source]

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[change | change source]

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[change | change source]

Pounds per square inch, a unit of pressure

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