Copy and paste the omicron symbol ο — click the button or any variant below
Omicron Symbol Copy and Paste
Click any symbol below to copy it to your clipboard instantly.
οOmicronCopied!
ΟCapital OmicronCopied!
Unicode Character
ο
Unicode Hex
U+03BF
HTML Entity
ο
Decimal Code
959
Capital Letter
Ο U+039F
About the Omicron Symbol
Last reviewed on October 1, 2026
Omicron is the fifteenth letter of the Greek alphabet. Both forms look identical to the Latin o and O, so mathematicians rarely use it — and the code points are different, which matters for search and screen readers.
Where ο is used
The name of the SARS-CoV-2 Omicron variant (2021).
Occasionally used for little-o and big-O notation in older texts.
Spelling Greek words correctly — use ο, not the Latin o, in Greek text.
Related characters
Browse the full Greek Letters list, or pick a sibling character from the grid below.
How to Type the Omicron Symbol
Windows: Type 03BF then press Alt+X in Word for lowercase ο, or 039F then Alt+X for capital Ο. There is no classic Alt code for omicron
Mac: Switch to the Greek keyboard layout (System Settings → Keyboard → Input Sources), or press Ctrl+Cmd+Space and search for “omicron”
Microsoft Word: Type 03BF then press Alt+X to convert it into ο
LaTeX:o in math mode
HTML: Use the entity ο or the numeric code ο
Phone & tablet: Copying ο from this page is fastest — see our mobile typing guide for keyboard tricks
Omicron Symbol Code for HTML, CSS & JavaScript
HTML: ο
CSS: content: '\03BF';
JavaScript: '\u03BF'
Unicode: U+03BF
Frequently Asked Questions
How do I type the omicron symbol ο on Windows?
Type 03BF then press Alt+X in Word for lowercase ο, or 039F then Alt+X for capital Ο. There is no classic Alt code for omicron. You can also copy ο straight from this page — it pastes into any app.
How do I type ο on a Mac?
Switch to the Greek keyboard layout (System Settings → Keyboard → Input Sources), or press Ctrl+Cmd+Space and search for “omicron”.
What is the Unicode and HTML code for the omicron symbol?
The omicron symbol is Unicode code point U+03BF. In HTML, use ο or the numeric reference ο.
How do I write ο in LaTeX?
Use o in math mode, for example $o$.
Is omicron the same character as the letter o?
No. Omicron ο is U+03BF and the Latin o is U+006F. They look the same in most fonts but are different characters, so a search for one will not match the other.