Copy and paste the eta symbol η — click the button or any variant below
Eta Symbol Copy and Paste
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ηEtaCopied!
ΗCapital EtaCopied!
ͱHeta (archaic)Copied!
Unicode Character
η
Unicode Hex
U+03B7
HTML Entity
η
Decimal Code
951
Capital Letter
Η U+0397
About the Eta Symbol
Last reviewed on October 1, 2026
Eta is the seventh letter of the Greek alphabet. Its capital form looks exactly like the Latin H, which is why lowercase η is the form you almost always need.
Where η is used
Efficiency η in thermodynamics and electrical engineering (η = output / input).
Dynamic viscosity η in fluid mechanics.
The Dedekind eta function in number theory, and pseudorapidity η in particle physics.
Related characters
Browse the full Greek Letters list, or pick a sibling character from the grid below.
How to Type the Eta Symbol
Windows: Type 03B7 then press Alt+X in Word for lowercase η, or 0397 then Alt+X for capital Η. There is no classic Alt code for eta
Mac: Switch to the Greek keyboard layout (System Settings → Keyboard → Input Sources), or press Ctrl+Cmd+Space and search for “eta”
Microsoft Word: Type 03B7 then press Alt+X to convert it into η
LaTeX:\eta in math mode
HTML: Use the entity η or the numeric code η
Phone & tablet: Copying η from this page is fastest — see our mobile typing guide for keyboard tricks
Eta Symbol Code for HTML, CSS & JavaScript
HTML: η
CSS: content: '\03B7';
JavaScript: '\u03B7'
Unicode: U+03B7
Frequently Asked Questions
How do I type the eta symbol η on Windows?
Type 03B7 then press Alt+X in Word for lowercase η, or 0397 then Alt+X for capital Η. There is no classic Alt code for eta. You can also copy η straight from this page — it pastes into any app.
How do I type η on a Mac?
Switch to the Greek keyboard layout (System Settings → Keyboard → Input Sources), or press Ctrl+Cmd+Space and search for “eta”.
What is the Unicode and HTML code for the eta symbol?
The eta symbol is Unicode code point U+03B7. In HTML, use η or the numeric reference η.