Greek Capital Omega HTML entity Ω

Ω is the HTML entity for Greek Capital Omega Ω (U+03A9). Copy the decimal Ω and hex Ω codes plus CSS, JavaScript, Python and URL escapes.

Entity: Ω
Also written: &ohm;
Code point: U+03A9
Unicode name: GREEK CAPITAL LETTER OMEGA
Block: Greek and Coptic
Category: Uppercase letter (Lu)
Since: Unicode 1.1
Defined in: HTML 4.01 and HTML5

Codes to copy

HTML named	`Ω`Works in HTML; in XML only & < > " ' are predefined.
HTML decimal	`Ω`Works in HTML and XML.
HTML hex	`Ω`Works in HTML and XML.
CSS	`content: "\3A9";`In a stylesheet, for ::before and ::after.
JavaScript	`"\u03A9"`Also valid in JSON.
Python	`"\u03a9"`Python 3 string literal.
Python by name	`"\N{GREEK CAPITAL LETTER OMEGA}"`Readable alternative using the Unicode name.
URL	`%CE%A9`Percent-encoded UTF-8 bytes, for a path or query value.
UTF-8 bytes	`CE A9`2 bytes.
UTF-16	`03A9`1 code unit, which is what JavaScript length counts.

When to use it

The Greek capital omega, also the symbol for the ohm. Unicode treats the separate ohm sign U+2126 as equivalent to this letter and recommends the letter, which is why &ohm; points here.

The name dates from HTML 4, so it works in every browser and in old email clients.

More greek letters

All greek letters · Every HTML entity · Encode or decode text

Source: the WHATWG HTML Standard list of named character references and the Unicode Character Database (Unicode 18.0).