Psi

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