Psi
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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