Greek Capital Letter Omega Ω

The Greek Capital Letter Omega character (Ω) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference Ω, the decimal numeric character reference Ω, or the hexadecimal numeric reference Ω. The character is assigned Unicode code point U+03A9 in the Universal Character Set.

Greek capital omega (Ω) is the last letter of the Greek alphabet, symbolizing the end or the ultimate. It is the SI symbol for the ohm, the unit of electrical resistance. The horseshoe-shaped letter is visually distinctive and culturally significant as part of the alpha-omega pair meaning 'beginning and end.'

Greek letter entities are indispensable for scientific papers, engineering documentation, statistical analyses, and mathematical content published on the web. From physics equations using alpha and omega to statistical formulas featuring sigma and mu, these entities allow content authors to include Greek characters reliably without requiring specialized fonts or complex Unicode input methods on the keyboard.

When deciding how to encode the Greek Capital Letter Omega character in your HTML documents, the named entity Ω is generally the most readable choice for developers reviewing or maintaining source code. The decimal form Ω and hexadecimal form Ω are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the capital omega entity for the ohm unit (100 Ω), in electrical engineering documentation, and in cultural contexts referencing 'the alpha and the omega.' It is essential for any web content about electrical circuits, resistance, and impedance.