Eta Symbol

Η η

The eta symbol (Η / η) 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 eta symbol with one click.

Uppercase Eta Symbol (Η)

Symbol	Format	Data
Η	Unicode	U+0397
Η	HTML	Η
Η	CSS	\0397
Η	JavaScript	\u0397
$\Eta$	TeX	\Eta
	SVG	Download ↓
	Image	Download ↓

Also known as: eta, uppercase eta, big eta, greek eta, greek h, h greek letter, greek letter h.

The Greek capital letter Eta (Η) coincides in shape with the Latin capital H, so it seldom carries an independent meaning in mathematical notation. It may be used as a label for a set, matrix, or function where a Greek-letter family is being referenced. The lowercase eta, by contrast, appears widely in physics and statistics for efficiencies and correlation coefficients.

\Eta(x) = \eta(x)

Lowercase Eta Symbol (η)

Symbol	Format	Data
η	Unicode	U+03B7
η	HTML	η
η	CSS	\03b7
η	JavaScript	\u03B7
$\eta$	TeX	\eta
	SVG	Download ↓
	Image	Download ↓

Also known as: greek eta, greek h, curly n, squiggly n, efficiency symbol, viscosity symbol, eta squared, dedekind eta.

The lowercase Greek letter eta η is used as a variable in many branches of mathematics and physics. In statistics η² denotes an effect-size measure, in differential geometry the Minkowski metric tensor carries this name, and in physics it labels viscosity and efficiency. In number theory the Dedekind eta function is a modular form of weight one half, while the Dirichlet eta function is the alternating counterpart of the Riemann zeta function.

\eta(1) = 1 - \frac{1}{2} + \frac{1}{3} - \cdots = \ln 2

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Eta Symbol — Η Greek Capital Letter Eta, η Greek Small Letter Eta