SymbolHub

Omega Symbol (Ω)

The omega symbol Ω is Unicode U+03A9, the last letter of the Greek alphabet, also used for ohms. Press Copy to put it on your clipboard, or type it with Alt + 234 on Windows or Option + Z on a Mac.

Unicode
U+03A9
HTML
Ω
Windows
Alt + 234
Mac
Option + Z

How to type the omega symbol (Ω)

The quickest way is to press Copy above and paste. To type Ω yourself, use the method for your device below. On a Mac it is Option + Z.

Windows

  1. Hold Alt and type 234 on the numeric keypad. This older code (from code page 437) works in Notepad, Word and most desktop apps.
  2. In Word or Outlook, type 03A9 and press Alt + X. Alt + X converts the hex code before the cursor into the character, and back again.
  3. Press Win + R, type charmap and press Enter. Tick “Advanced view”, search for Greek Capital Letter Omega, then Select and Copy. Character Map is built into every version of Windows.

Mac

  1. Press Option+Z. On the standard US and US-International layouts.
  2. Press Control + Command + Space to open the Character Viewer, search for omega and double-click it.

Linux & ChromeOS

  1. Press Ctrl + Shift + U, type 3a9, then press Enter or Space. Works in GTK and IBus apps (GNOME, Firefox, Chrome, LibreOffice) and on ChromeOS.

iPhone & iPad

  1. Copy Ω from this page, then go to Settings → General → Keyboard → Text Replacement and add it with a shortcut such as ;omeg. The shortcut then turns into the symbol as you type, in every app.

Android

  1. Copy Ω here, then open Gboard settings → Dictionary → Personal dictionary and add it with a shortcut.

Microsoft Word

  1. Type 03A9, then press Alt + X.
  2. Insert → Symbol → More Symbols. Set “from” to Unicode (hex), type 03A9 in “Character code” and click Insert.
  3. On a Mac, Option+Z works in Word too.

Google Docs

  1. Insert → Special characters, then search for “omega” or draw it in the box.

Excel & Google Sheets

  1. Enter =UNICHAR(937) in a cell. It works in Excel 2013 and later and in Google Sheets.

HTML

  1. Write Ω or Ω in your HTML.

What does Ω mean?

Omega (Ω, lowercase ω) is the twenty-fourth and last letter of the Greek alphabet. Its name means “big o”, as opposed to omicron, “little o”. Because it comes last, “alpha and omega” means the beginning and the end, and Ω often stands for finality or the ultimate version of something.

In science the capital Ω is the unit symbol for the ohm, the unit of electrical resistance: a 220 Ω resistor. The lowercase ω means angular velocity or angular frequency in physics. Unicode has a separate Ohm sign Ω (U+2126), but it is only kept for compatibility: it normalises to the Greek capital Omega, and the Unicode Standard recommends U+03A9 for ohms too.

Omega is easy to type. On a Mac, Option + Z types Ω, and on Windows Alt + 234 does the same in most apps. In HTML it has two names, Ω and Ω.

Common uses

  • Electronics: a 4.7 kΩ resistor
  • Physics: angular frequency ω = 2πf
  • Watches and brands: Omega, and Ω in logos
  • Finality: “the Ω of the series”

Omega Symbol codes for HTML, CSS and programming

Every code below produces Ω. Use the HTML entity in web pages, the CSS escape in content, and the escape sequence in source code.

Unicode code pointU+03A9
HTML entity (named)Ω
HTML decimalΩ
HTML hexΩ
CSS contentcontent: "\3A9";
JavaScript"\u03A9"
Python"\u03A9"
Python (by name)"\N{GREEK CAPITAL LETTER OMEGA}"
Java / C#"\u03A9"
LaTeX\Omega
UTF-8 bytesCE A9
UTF-1603A9
URL encoded%CE%A9
Alt code (CP437)Alt + 234
Mac shortcutOption + Z

Ω vs look-alike characters

These characters look similar to Ω but have a different meaning and code. Pasting the wrong one can break search, sorting and screen readers.

CharNameWhen to use it
Ohm
U+2126		Ohm sign (U+2126). A compatibility duplicate that normalises to Ω. Use U+03A9 for new text.
Greek Omega
U+03C9		Greek small omega (U+03C9), for angular velocity.
Inverted Ohm
U+2127		Inverted ohm sign, the mho (U+2127), an old unit of conductance.
Cherokee Letter Ka
U+13A7		Cherokee letter U (U+13A7), which resembles an omega.

Symbols similar to Ω

Click to copy, or open a symbol for its codes. See the full greek letters collection.

Ω character properties

Official Unicode name
GREEK CAPITAL LETTER OMEGA
Also known as
omega, capital omega, greek letter omega, ohm
Code point
U+03A9
Unicode block
Greek and Coptic (U+0370–U+03FF)
General category
Uppercase letter (Lu)
Added in
Unicode 1.1 (1993)
Plane
Basic Multilingual Plane (0)
Emoji
No, it is a text symbol

Frequently asked questions

How do I type the omega symbol on a Mac?

Press Option + Z. It works in every app on the standard US keyboard layout.

What is the difference between Ω and the ohm sign Ω?

They look the same. U+03A9 is the Greek capital omega; U+2126 is a legacy ohm sign that Unicode maps back to U+03A9. Use U+03A9 in all new text.

What does ω mean in physics?

Lowercase omega usually means angular velocity or angular frequency, measured in radians per second.

What is the alt code for the omega symbol?

On Windows, hold Alt and type 234 on the numeric keypad to get Ω. On a laptop without a keypad, copy it from this page or use 03A9 then Alt + X in Word.

How do I type the omega symbol on a Mac?

Press Option + Z. It works in every app on the US keyboard layout. You can also open the Character Viewer with Control + Command + Space and search for it.

What is the HTML code for the omega symbol?

Use the named entity Ω or the numeric reference Ω (hex Ω). All three display Ω in every browser.

What is the Unicode for the omega symbol?

Ω is U+03A9, officially named GREEK CAPITAL LETTER OMEGA, in the Greek and Coptic block. It has been part of Unicode since version 1.1 (1993).