Xi Symbol Ξ ξ — Copy, Paste and Type It

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

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

Q: What is the LaTeX command for xi?

Use \xi for lowercase ξ and \Xi for capital Ξ, inside math mode: $\xi$.

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

Lowercase ξ is U+03BE, written in HTML as ξ or ξ. Capital Ξ is U+039E, written Ξ or Ξ.

The xi symbol is the 14th letter of the Greek alphabet, written ξ in lowercase and Ξ in uppercase. It is pronounced /zaɪ/ (“ZY, KSY or KSEE”). Click a symbol to copy it.

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Copy the xi symbol

Greek small letter xi U+03BE · The lowercase letter

Greek capital letter Xi U+039E · The uppercase letter

Identical to U+2261 · The “identical / congruent” sign ≡. Three bars, but not Ξ.

Dashed boxes are look-alikes that are not the Greek letter — listed so you can tell them apart.

Xi codes — Unicode, HTML, LaTeX and Alt codes

Char	Unicode	HTML entity	HTML decimal	HTML hex	CSS	JavaScript	LaTeX	Windows	Mac
ξ	`U+03BE`	`ξ`	`ξ`	`ξ`	`\03BE`	`\u03BE`	`\xi`	`03BE` then `Alt + X` (Word)	Greek keyboard `J`
Ξ	`U+039E`	`Ξ`	`Ξ`	`Ξ`	`\039E`	`\u039E`	`\Xi`	`039E` then `Alt + X` (Word)	Greek keyboard `Shift + J`
≡	`U+2261`	`&equiv;`	`≡`	`≡`	`\2261`	`\u2261`	`\equiv`	`2261` then `Alt + X` (Word)	Character Viewer

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

How to type the xi symbol

Windows

Fastest: press Win + . to open the emoji panel, choose the Symbols tab (Ω), then Greek.
There is no classic Alt code for xi — 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 03BE and press Alt + X for ξ; 039E then Alt + X for Ξ. Word converts it in place.

Mac

Add the Greek keyboard in System Settings → Keyboard → Input Sources, then J types ξ and Shift + J types Ξ.
Or open the Character Viewer with Ctrl + Cmd + Space and search “xi”.

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

\xi — lowercase ξ in math mode
\Xi — capital Ξ
\equiv — ≡ (identical to)

HTML, CSS and code

HTML: ξ or ξ or ξ
CSS: content: "\03BE";
JavaScript / JSON: "\u03BE" — Python: "\u03be"
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 xi mean?

Mathematics & statistics

ξ — a random variable or a dummy variable of integration

Physics

Ξ — the Xi baryons (“cascade particles”)
ξ — correlation length; Ξ — the grand canonical partition function

Xi at a glance

Position: 14th of 24
Uppercase / lowercase: Ξ ξ
Greek name: ξι
Pronunciation: /zaɪ/
Numeric value: 60
Became: Cyrillic Ѯ (ksi)

Frequently asked questions

What is the xi symbol?

Xi (Ξ ξ) is the 14th letter of the Greek alphabet, pronounced /zaɪ/ (“ZY, KSY or KSEE”). It is most often used for random variables, the Xi baryon.

How do I type the xi symbol on a keyboard?

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

What is the LaTeX command for xi?

Use \xi for lowercase ξ and \Xi for capital Ξ, inside math mode: $\xi$ .

What is the Unicode and HTML code for xi?

Lowercase ξ is U+03BE, written in HTML as ξ or ξ. Capital Ξ is U+039E, written Ξ or Ξ.

← See all 24 Greek symbols