Psi Symbol

Ψ ψ

The psi symbol (Ψ / ψ) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the psi symbol with one click.

Uppercase Psi Symbol (Ψ)

Symbol	Format	Data
Ψ	Unicode	U+03A8
Ψ	HTML	Ψ
Ψ	CSS	\03a8
Ψ	JavaScript	\u03A8
$\Psi$	TeX	\Psi
	SVG	Download ↓
	Image	Download ↓

Also known as: psi, uppercase psi, big psi, greek psi, trident symbol, wave function symbol, pitchfork symbol.

The Greek capital letter Psi (Ψ) is used in quantum mechanics for the wave function of a full system, often in contrast with a lowercase psi for a stationary-state factor. Beyond physics, Ψ is widely recognized as the symbol of psychology and psychiatry.

\Psi(x, t) = \psi(x) e^{-iEt/\hbar}

Lowercase Psi Symbol (ψ)

Symbol	Format	Data
ψ	Unicode	U+03C8
ψ	HTML	ψ
ψ	CSS	\03c8
ψ	JavaScript	\u03C8
$\psi$	TeX	\psi
	SVG	Download ↓
	Image	Download ↓

Also known as: greek psi, psi letter, lowercase psi, wave function symbol, psi quantum mechanics, trident shaped letter, psi greek alphabet.

Psi ψ is the twenty-third letter of the Greek alphabet. In mathematics and physics it frequently names the wave function in quantum mechanics, and it also appears for angles, the digamma function in analysis, and various special mappings.

\psi(x, t) = A e^{i(kx - \omega t)}

Customize & Download

Pick a letterform, adjust its size, colors, and spacing, then copy the ready-to-use HTML code or download it as a square image.

Settings

Letterform

Text color

Background

Symbol size64 px

Corner radius0 px

Padding24 px

OutputPreview

Psi Symbol — Ψ Greek Capital Letter Psi, ψ Greek Small Letter Psi