U+03A9 · Greek and Coptic

Omega (Capital) Ω

Ω is the capital Greek letter omega, the last letter of the Greek alphabet, so it often stands for an end or ultimate limit, as in “the Alpha and the Omega.” In electronics it is the unit symbol for the ohm, as in 470 Ω. It also marks asymptotic lower bounds, Ω(n), in computer science.

WindowsAlt 234

MacOption + Z

UnicodeU+03A9

HTMLΩ

ΩU+03A9

Character codes

Unicode code point	`U+03A9`
Decimal	`937`
HTML named entity	`Ω`
HTML (hex)	`Ω`
HTML (decimal)	`Ω`
CSS	`\03A9`
JavaScript	`\u03A9`
Python	`\u03A9`
UTF-8 bytes	`CE A9`
UTF-16	`03A9`
URL-encoded	`%CE%A9`

Character details

Official name	GREEK CAPITAL LETTER OMEGA
Unicode block	Greek and Coptic
General category	Uppercase Letter (Lu)
SymbolHero category	Greek Letters
Lowercase	ω Omega (ω)
Emoji	No

How to type Ω

Windows

Hold Alt and type 234 on the numeric keypad (Num Lock on), then release Alt. Alt 234 uses the code page 437.
In Microsoft Word or Outlook: type 03A9 then press Alt + X.
Open Character Map (search “Character Map” in Start), tick “Advanced view”, search for “greek capital letter omega”, then Select and Copy.

Mac

Press Option + Z (US English keyboard layout).
Press Control + Command + Space to open the Character Viewer, search “greek capital letter omega”, and double-click the result.
With the Unicode Hex Input keyboard enabled (System Settings → Keyboard → Input Sources), hold Option and type 03A9.

iPhone & Android

Tap Copy at the top of this page, then long-press where you want it and choose Paste.

Docs & web

Google Docs: Insert → Special characters, then search “greek capital letter omega” or enter U+03A9.
HTML: Ω or Ω
Excel / Google Sheets: =UNICHAR(937)

Examples

R = 470 Ω
the Alpha and the Omega
Sorting requires Ω(n log n) comparisons.
10 kΩ resistor

Good to know

Don’t mix it up: It is visually identical to the ohm sign Ω (U+2126), a compatibility character that Unicode normalization converts to this Greek letter.

Tip: Use this character (U+03A9) for ohms too; it is what Unicode recommends and what search engines match.

Display: the character itself is always the same code point, but its shape comes from the font on the device showing it. If you see an empty box, the font lacks this glyph—the text is still correct.