Xi Symbol

Ξ ξ

The xi symbol (Ξ / ξ) 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 xi symbol with one click.

Uppercase Xi Symbol (Ξ)

Symbol	Format	Data
Ξ	Unicode	U+039E
Ξ	HTML	Ξ
Ξ	CSS	\039e
Ξ	JavaScript	\u039E
$\Xi$	TeX	\Xi
	SVG	Download ↓
	Image	Download ↓

Also known as: xi, uppercase xi, big xi, greek xi, three horizontal bars.

Ξ is the capital form of the Greek letter xi. It appears infrequently in mathematics, though it names the xi baryon in particle physics and occasionally denotes a quantity or operator where the lowercase ξ is already assigned. The lowercase form is the more common of the two in analysis and statistics.

\Xi

Lowercase Xi Symbol (ξ)

Symbol	Format	Data
ξ	Unicode	U+03BE
ξ	HTML	ξ
ξ	CSS	\03be
ξ	JavaScript	\u03BE
$\xi$	TeX	\xi
	SVG	Download ↓
	Image	Download ↓

Also known as: lowercase xi, small xi, greek xi, xi greek letter, ksi, random variable xi, squiggly greek letter.

The Greek letter ξ (xi) is the fourteenth letter of the Greek alphabet. In mathematics and physics it commonly denotes a random variable in probability theory, a spatial or characteristic coordinate in differential equations, and a parameter in various special functions. Its uppercase form Ξ appears less frequently, for instance in particle physics.

P(\xi \leq x) = F(x)

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Xi Symbol — Ξ Greek Capital Letter Xi, ξ Greek Small Letter Xi