ψ
(Redirected from 𝜓)
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Character variations
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Translingual
Symbol
ψ
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Turned_psi.svg/170px-Turned_psi.svg.png)
- Psychology.
- Psychiatry.
- Parapsychology, psychics.
- (quantum mechanics) A wavefunction.
- (electrical engineering) Electric flux.
- (physics, biochemistry) Water potential in cells.
- (astrology, dated) Neptune.
- (astrology, italic) asteroid (16) Psyche (a stylized 𝜓)
- (Christianity) The Psalms (a book in the Bible).
- (phonetics, dated) a voiceless retroflex click, IPA ⟨k͜𝼊⟩.
- (Uralic Phonetic Alphabet) A bilabial trill, IPA ⟨ʙ⟩.
Usage notes
(quantum physics): Some texts use Ψ (uppercase) for the actual wavefunction that appears in the time-dependent Schrödinger equation, and ψ (=ΨeiEt/ħ) (lowercase) for the time-independent spatial wave function that may exist for stationary states (and which then appears in the time-independent Schrödinger equation), but this distinction is not always observed. Otherwise, the distinction may be made by providing the arguments.
Ancient Greek
Etymology
Derived from its majuscule counterpart Ψ.
Letter
ψ • (ps) (lowercase, uppercase Ψ)
- 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.
Derived terms
See also psi
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) ᾿ ῾ ◌́ ◌̀ ῀ ¨
Greek
Letter
ψ • (ps) (lowercase, uppercase Ψ)
- The lower case letter psi (ψι), the 23rd letter of the modern Greek alphabet.
Derived terms
See also
Categories:
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