ψ

Symbol

ψ

1. Psychology.
2. Psychiatry.
3. Parapsychology, psychics.
4. (quantum mechanics) A wavefunction.
5. (electrical engineering) Electric flux.
6. (physics, biochemistry) Water potential in cells.
7. (astrology, dated) Neptune.
8. (astrology, italic) asteroid (16) Psyche (a stylized 𝜓)
9. (Christianity) The Psalms (a book in the Bible).
10. (phonetics, dated) a voiceless retroflex click, IPA ⟨k͜𝼊⟩.

    (turned) a voiced retroflex click, IPA ⟨ɡ͜𝼊⟩.

11. (UPA) A bilabial trill, IPA ⟨ʙ⟩.

Etymology

Derived from its majuscule counterpart Ψ.

Letter

ψ • (ps) (lowercase, uppercase Ψ)

1. Lower-case psi (ψεῖ), the 23rd letter of the ancient Greek alphabet. It represented the consonant cluster /ps/ in the Eastern Greek alphabet and the voiceless aspirated velar plosive /kʰ/ in the Western Greek alphabet (compare Etruscan 𐌙 khe). It is preceded by χ and followed by ω.

See also

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Letter

ψ • (ps) (lowercase, uppercase Ψ)

1. The lower case letter psi (ψι), the 23rd letter of the modern Greek alphabet.

See also

• Appendix:Greek alphabet
• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨