Copy and paste the omega symbol ω — click the button or any variant below
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Last reviewed on October 1, 2026
The Omega symbol (ω) is one of the greek letters characters in the AllSymbols catalog. It is part of the Unicode Greek and Coptic block (U+0370–U+03FF). Greek letters serve double duty: they spell modern Greek and ancient Greek text, and they appear all through math, physics, statistics, and engineering as variable names with conventional meanings.
In technical writing, the letter is the variable; the meaning comes from your field’s convention. Pi (π) is the circle constant in geometry but a probability in statistics. Sigma (σ) is a standard deviation as a variable and a sum operator (Σ) when capitalized. Always introduce a Greek letter on first use unless your audience can be assumed to know the convention.
In Unicode, Omega sits at code point U+03C9. Web pages reference it with the HTML numeric entity ω; CSS rules reference it as a quoted hex escape (the four-digit code prefixed with a backslash); in JavaScript and most modern source-code contexts you can either paste the literal character or use a Unicode escape with the same hex digits.
Several Greek capitals look identical to Latin capitals (Alpha = A, Beta = B, Mu = M, Nu = N). They are distinct code points and may render with subtle differences. Use the Latin letter when you mean the Latin letter, and the Greek capital only when the meaning is specifically Greek — this matters for screen readers and search.
If Omega isn’t quite what you need, the Greek Letters page lists every related character on the site — including Alpha and Mu. The related-symbols grid below also surfaces the closest sibling characters.
Electronics uses capital omega for ohms. Unicode also has a separate “ohm sign” for compatibility, but the Greek capital is the recommended character:
| Char | Name | Unicode | Use it for |
|---|---|---|---|
| ω | Greek small omega | U+03C9 | Angular frequency, the last item in a series. |
| Ω | Greek capital omega | U+03A9 | Ohms (10 kΩ). The recommended character, including for units. |
| Ω | Ohm sign | U+2126 | Legacy duplicate. Unicode normalizes it to U+03A9. |
| ℧ | Inverted ohm (mho) | U+2127 | Old unit of conductance, now siemens. |
| ϖ | Pi symbol (omega pi) | U+03D6 | Looks like ω with a bar. It is a variant of pi. |
On a Mac, Option+Z types Ω. On Windows, Alt+234 types Ω; for lowercase ω, type 03C9 then Alt+X in Word.
Hold Alt and type 234 on the numeric keypad for capital Ω; for lowercase ω, type 03C9 then press Alt+X in Word. You can also copy ω straight from this page — it pastes into any app.
Press Option+Z for Ω; for lowercase ω use the Character Viewer (Ctrl+Cmd+Space).
The omega symbol is Unicode code point U+03C9. In HTML, use the entity ω or the numeric reference ω.