Kappa Symbol

Κ κ

The kappa symbol (Κ / κ) 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 kappa symbol with one click.

Uppercase Kappa Symbol (Κ)

Symbol	Format	Data
Κ	Unicode	U+039A
Κ	HTML	Κ
Κ	CSS	\039a
Κ	JavaScript	\u039A
$\text{K}$	TeX	\Kappa
	SVG	Download ↓
	Image	Download ↓

Also known as: kappa, uppercase kappa, big kappa, greek kappa, greek k, k greek letter, kapa.

The Greek capital letter Kappa (Κ) matches the Latin capital K in form and is consequently uncommon as a distinct mathematical symbol. It occasionally appears as a label for a set or matrix alongside other Greek letters. The lowercase kappa is far more prevalent, denoting curvature in differential geometry and condition numbers in numerical analysis.

\Kappa = \{x : \kappa(x) > 0\}

Lowercase Kappa Symbol (κ)

Symbol	Format	Data
κ	Unicode	U+03BA
κ	HTML	κ
κ	CSS	\03ba
κ	JavaScript	\u03BA
$\kappa$	TeX	\kappa
	SVG	Download ↓
	Image	Download ↓

Also known as: greek kappa, lowercase kappa, small kappa, kappa letter, curvature symbol, greek k, cursive k, cohens kappa.

Kappa is the tenth letter of the Greek alphabet, and its lowercase form κ resembles a cursive k. In differential geometry it denotes the curvature of a plane curve, while in statistics Cohen's kappa measures inter-rater agreement. It also serves as a general-purpose constant or parameter in analysis.

\kappa = \frac{|y''|}{(1 + (y')^2)^{3/2}}

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Kappa Symbol — Κ Greek Capital Letter Kappa, κ Greek Small Letter Kappa