Omicron Symbol
Ο ο
The omicron symbol (Ο / ο) 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 omicron symbol with one click.
Uppercase Omicron Symbol (Ο)
| Symbol | Format | Data |
|---|---|---|
| Ο | Unicode | U+039F |
| Ο | HTML | Ο |
| Ο | CSS | \039f |
| Ο | JavaScript | \u039F |
| TeX | \Omicron | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: omicron, uppercase omicron, big omicron, greek omicron, greek o, o greek letter, omikron.
The Greek capital letter Omicron (Ο) is identical in appearance to the Latin capital O and so is almost never used as an independent mathematical symbol. The lowercase form is likewise visually indistinguishable from the Latin o and is generally avoided for the same reason. Authors steer clear of both forms to prevent confusion with the letter O and the digit 0.
Lowercase Omicron Symbol (ο)
| Symbol | Format | Data |
|---|---|---|
| ο | Unicode | U+03BF |
| ο | HTML | ο |
| ο | CSS | \03bf |
| ο | JavaScript | \u03BF |
| TeX | \omicron | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: greek omicron, lowercase omicron, greek o, omicron letter, greek letter o, greek alphabet o, omikron.
The lowercase Greek letter omicron (ο) is visually identical to the Latin o, so it is rarely used on its own as a mathematical symbol. It appears mainly in contexts that list or transliterate the Greek alphabet — for example in the official naming of SARS-CoV-2 variants. When a small-o shape is needed in formulas, authors almost always write the Latin letter instead.
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