Greek Symbol
Greek letter

Psi Symbol (ψ) — Copy & Paste

Grab the psi greek symbol in one click. Pronunciation: sy / psee.

ΨUpper
ψLower
Reference

Technical reference

Unicode, HTML entities, and LaTeX — tap the icon beside any value.

Uppercase Psi

Character
Ψ
Unicode
U+03A8
HTML named
Ψ
HTML decimal
Ψ
LaTeX
\Psi

Lowercase Psi

Character
ψ
Unicode
U+03C8
HTML named
ψ
HTML decimal
ψ
LaTeX
\psi
Context

Common uses in science & math

Wave functions

Quantum mechanics famously writes ψ (or Ψ) for the wave function.

Psychology & stream functions

Psychology’s “psi” brand borrows the letter; fluid dynamics may use ψ for stream functions.

Input

How to type Psi

Windows

Grab ψ/Ψ from this page for quantum notes.

macOS

Use this page or search “psi” in Character Viewer.

Word & Google Docs

Paste ψ into Markdown lecture notes and Overleaf via Unicode.

Prefer a full walkthrough? Read how to type Greek letters.

Explore
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Psi FAQ

Is psi used only in physics?

No—it appears in psychology branding, mathematics, and engineering, but QM wave functions are the classic STEM use.