Character
Η
Unicode
U+0397HTML named
ΗHTML decimal
ΗLaTeX
HEta Symbol (η) — Copy & Paste
Grab the eta greek symbol in one click. Pronunciation: AY-tuh.
ΗUpper
ηLower
Technical reference
Unicode, HTML entities, and LaTeX — tap the icon beside any value.
Character
η
Unicode
U+03B7HTML named
ηHTML decimal
ηLaTeX
\etaCommon uses in science & math
Efficiency & viscosity
Engineering uses η for efficiency; fluid dynamics often uses η for dynamic viscosity.
Learning rate (ML)
Older ML papers sometimes use η for the learning rate (today λ or α are also common).
How to type Eta
Windows
Grab η from this page to avoid mixing it up with Latin n or h.
macOS
Use this page; Character Viewer lists “eta”.
Word & Google Docs
Paste η for efficiency formulas in lab reports and slides.
Prefer a full walkthrough? Read how to type Greek letters.
Related Greek letters
Eta FAQ
Does uppercase eta look like Latin H?
Yes—Η closely resembles H. Prefer lowercase η in prose if ambiguity matters, or state “Greek eta”.