Home › Greek Letters › Omega Symbol
Omega Symbol (Ω)
Omega (Ω) is the last letter of the Greek alphabet — and the symbol for the ohm, the unit of electrical resistance.
Omega Symbol codes
| Code | Value |
|---|---|
| Unicode code point | U+03A9 |
| Unicode name | Greek Capital Letter Omega |
| HTML named entity | Ω |
| HTML decimal | Ω |
| HTML hex | Ω |
| CSS content code | \3A9 |
| JavaScript / JSON | \u03A9 |
| Windows Alt code | No standard Alt code — copy it from the card above |
| LaTeX | \Omega |
Omega Symbol variants (4)
4 related glyphs — click any tile to copy it. Tiles with a page open that symbol's own page.
Meaning & usage
Ω ends the Greek alphabet, so it stands for the ultimate or final thing — 'the alpha and the omega'. Electricians know it better as the ohm: a resistor marked 470Ω resists current with 470 ohms, named after Georg Ohm.
The lowercase ω measures angular frequency in physics. Watch out for its twin: U+2126 is a separate 'Ohm sign' that looks identical — the Ω on this page is the standard Greek capital omega that every system handles.
Examples in use
- A 10 kΩ resistor
- 'I am the alpha and the Ω'
- ω = 2πf for angular frequency
How to type the omega symbol
Windows
There is no Alt code or direct key for Ω. In Microsoft Word, type 03A9 and press Alt+X to convert it. Everywhere else, click the Copy button at the top of this page and paste it (Ctrl+V) — that always works.
Mac
There is no Option-key shortcut for Ω on a Mac. Open the Character Viewer with Control+Command+Space, search for "Omega Symbol", and double-click to insert — or copy it from this page.
iPhone & Android
Most phone keyboards have no built-in key for Ω. Open this page on your phone, tap Copy, then paste it into your message or bio. (On Android, Gboard's emoji search finds some symbols by name.)
Linux
Press Ctrl+Shift+U, type 03a9 and press Enter (works in most GTK apps and terminals with IBus). Or copy it from this page.
Frequently asked questions
How do I type Ω on a keyboard?
There is no standard Alt code. Copy Ω from this page, or in Word type 03A9 then Alt+X. Mac users can switch to the Greek keyboard layout.
What does Ω mean on a multimeter?
It is measuring resistance in ohms. The Ω setting (and the kΩ / MΩ ranges) tells you how strongly a component resists electric current.
Why does Ω sometimes show as a box or question mark?
The box (called tofu) means the device or font viewing it has no drawing for U+03A9 (Greek Capital Letter Omega). The character itself is fine — try a different font or a newer device, or use one of the variants on this page.
Is the Omega Symbol free to use?
Yes. Ω is a standard Unicode text character published in the Unicode Character Database. You may use it in personal and commercial documents, designs and products without permission or payment.
Related symbols
More in Greek Letters · All symbols
Data: Unicode Character Database · Page updated 2026-11-13