Psi Symbol Ψ ψ — Copy, Paste and Type It

Q: How do I type the psi symbol on a keyboard?

On Windows, press Win + . → Symbols → Greek, or in Microsoft Word type 03C8 and press Alt + X. On a Mac, switch to the Greek keyboard and press C (Shift + C for the capital). Or simply copy it from the top of this page.

Q: What is the LaTeX command for psi?

Use \psi for lowercase ψ and \Psi for capital Ψ, inside math mode: $\psi$.

Q: What is the Unicode and HTML code for psi?

Lowercase ψ is U+03C8, written in HTML as ψ or ψ. Capital Ψ is U+03A8, written Ψ or Ψ.

The psi symbol is the 23rd letter of the Greek alphabet, written ψ in lowercase and Ψ in uppercase. It is pronounced /saɪ/ (“SIGH or PSIGH”). Click a symbol to copy it.

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Copy the psi symbol

Greek small letter psi U+03C8 · The lowercase letter

Greek capital letter Psi U+03A8 · The uppercase letter

Psi codes — Unicode, HTML, LaTeX and Alt codes

Char	Unicode	HTML entity	HTML decimal	HTML hex	CSS	JavaScript	LaTeX	Windows	Mac
ψ	`U+03C8`	`ψ`	`ψ`	`ψ`	`\03C8`	`\u03C8`	`\psi`	`03C8` then `Alt + X` (Word)	Greek keyboard `C`
Ψ	`U+03A8`	`Ψ`	`Ψ`	`Ψ`	`\03A8`	`\u03A8`	`\Psi`	`03A8` then `Alt + X` (Word)	Greek keyboard `Shift + C`

Need the characters without any explanation? Open the Greek letters copy-paste sheet.

How to type the psi symbol

Windows

Fastest: press Win + . to open the emoji panel, choose the Symbols tab (Ω), then Greek.
There is no classic Alt code for psi — the old DOS code page only included a handful of Greek letters (α Γ π Σ σ τ Φ Θ Ω δ φ ε). Use one of the other methods.
Microsoft Word: type 03C8 and press Alt + X for ψ; 03A8 then Alt + X for Ψ. Word converts it in place.

Mac

Add the Greek keyboard in System Settings → Keyboard → Input Sources, then C types ψ and Shift + C types Ψ.
Or open the Character Viewer with Ctrl + Cmd + Space and search “psi”.

iPhone and Android

iOS: Settings → General → Keyboard → Keyboards → Add New Keyboard → Greek. Tap the globe key to switch.
Android (Gboard): Settings → Languages → Add keyboard → Greek.
Or copy the character from the top of this page.

LaTeX

\psi — lowercase ψ in math mode
\Psi — capital Ψ

HTML, CSS and code

HTML: ψ or ψ or ψ
CSS: content: "\03C8";
JavaScript / JSON: "\u03C8" — Python: "\u03c8"
In source code, prefer the escape over the pasted glyph — it survives every file encoding.

Full typing guide for every platform, including Linux and Google Docs → how to type Greek letters.

What does psi mean?

Physics

ψ, Ψ — the quantum wavefunction in the Schrödinger equation
J/ψ — a meson; ψ — the stream function in fluid flow

Psychology

Ψ — the emblem of psychology and psychiatry, from ψυχή (psyche, soul)

Mathematics

ψ(x) — the digamma function

Not the letter

psi as a pressure unit means pounds per square inch — an abbreviation, not the Greek letter

Psi at a glance

Position: 23rd of 24
Uppercase / lowercase: Ψ ψ
Greek name: ψι
Pronunciation: /saɪ/
Numeric value: 700
Became: Cyrillic Ѱ (psi)

Frequently asked questions

What is the psi symbol?

Psi (Ψ ψ) is the 23rd letter of the Greek alphabet, pronounced /saɪ/ (“SIGH or PSIGH”). It is most often used for the wavefunction, the symbol of psychology.

How do I type the psi symbol on a keyboard?

On Windows, press Win + . → Symbols → Greek, or in Microsoft Word type 03C8 and press Alt + X. On a Mac, switch to the Greek keyboard and press C (Shift + C for the capital). Or simply copy it from the top of this page.

What is the LaTeX command for psi?

Use \psi for lowercase ψ and \Psi for capital Ψ, inside math mode: $\psi$ .

What is the Unicode and HTML code for psi?

Lowercase ψ is U+03C8, written in HTML as ψ or ψ. Capital Ψ is U+03A8, written Ψ or Ψ.

← See all 24 Greek symbols