Greek Letter Psi (Ψι - Ψ)


For some reasons the Greeks invented a separate letter for the "ps" sound. In Englis "p" is not pronounced when it starts a word ("psychiatrist", "psalms"), but in Greek it is.

"Ψ" Letter in mathematics and in science

Ψ represents:

  • Water potential

ψ represents:

  • the wave function in the Schrödinger equation of quantum mechanics
  • the stream function in fluid dynamics
  • yaw angle in vehicle dynamics

Greek words with "ψ"

ψάρι, ψαλμός

See Also:

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