What is psi meaning?

Psi (Ψ) is the 23rd letter of the Greek alphabet. It is commonly used in the fields of physics and psychology as a symbol for various concepts.

In physics, psi is used to represent wave functions in quantum mechanics, which describe the probability of a particle's position and momentum. It is also used as a symbol for the water potential of plant cells in plant physiology.

In psychology, psi is often used to represent paranormal or psychic phenomena, such as telepathy or clairvoyance. The term "psi" itself was coined in the 1940s by psychologist J.B. Rhine, who used it to refer to psychic abilities.

Overall, the meaning of psi can vary depending on the context in which it is used.