ψ

See also: Ψ, ⋔, ѱ, and Ѱ

ψ	U+03C8, ψ GREEK SMALL LETTER PSI

← χ
[U+03C7]

Greek and Coptic

ω →
[U+03C9]

Translingual

Symbol

ψ

(quantum mechanics) a wavefunction
(electrical engineering) Electric flux.

Usage notes

Some texts use Ψ (uppercase) for the actual wavefunction that appears in the time-dependent Schrödinger equation, and ψ (=Ψe^iEt/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.

Greek

Letter

ψ • (ps) (lowercase, uppercase Ψ)

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

Numeral

ψ' • (ps')

The number 700 in Greek numerals.

Numeral

,ψ • (,ps)

The number 700,000 in Greek numerals.

(Greek-script letters) Α α (A a), Β β (B b), Γ γ (G g), Δ δ (D d), Ε ε (E e), Ζ ζ (Z z), Η η (Ē ē), Θ θ (Th th), Ι ι ℩ (I i ℩), Κ κ (K k), Λ λ (L l), Μ μ (M m), Ν ν (N n), Ξ ξ (X x), Ο ο (O o), Π π (P p), Ρ ρ (R r), Σ σ ς (S s s), Τ τ (T t), Υ υ (U u), Φ φ (Ph ph), Χ χ (Kh kh), Ψ ψ (Ps ps), Ω ω (Ō ō)
(punctuation) · ;
(diacritics) ᾿ ῾ ´ ` ῀ ¨ ¯ ˘

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