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
- Water potential
- 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"