Omega Symbol (Ω) — How to Type, Copy & Paste the Greek Letter

Copy the Omega Symbol

Here are both forms of the omega symbol ready for you to copy and paste:

Ω — Capital Omega (U+03A9) — Copy this: Ω

ω — Lowercase Omega (U+03C9) — Copy this: ω

Capital Omega — Unicode: U+03A9 | HTML entity: Ω | CSS: \03A9

Lowercase Omega — Unicode: U+03C9 | HTML entity: ω | CSS: \03C9

What Does the Omega Symbol Mean?

Omega (Ω / ω) is the 24th and final letter of the Greek alphabet. The word "omega" literally means "great O" in Greek, distinguishing it from omicron ("little O"). In the Greek numeral system, omega has a value of 800.

Because it is the last letter, omega carries powerful symbolic meaning: endings, completion, and finality. The phrase "I am the Alpha and the Omega" — meaning the beginning and the end — is one of the most famous uses of the symbol in Western culture, originating from the Book of Revelation.

How to Type the Omega Symbol on Windows

There are several ways to type Ω on a Windows PC:

• Alt Code (Capital): Hold Alt and type 2 3 4 on the numeric keypad. Release Alt to produce Ω.
• Alt Code (Lowercase): Hold Alt and type 9 6 9 on the numeric keypad for ω.
• Character Map: Press Win + R, type charmap, search for "Omega," select it, and click Copy.
• Microsoft Word: Type 03A9 and press Alt + X for capital, or 03C9 and Alt + X for lowercase.

How to Type Omega on Mac

On macOS, you have a few options:

• Character Viewer: Press Ctrl + Cmd + Space, search for "omega," and double-click to insert it.
• Keyboard Shortcut (Greek keyboard): Add the Greek keyboard in System Settings > Keyboard > Input Sources. Then switch to it and press the "z" key for ω.
• Copy and Paste: Simply copy Ω or ω from this page and paste it wherever you need it.

How to Type Omega on iPhone and Android

On mobile devices, the easiest approach is to copy and paste from this page. However, you can also:

• iPhone: Add the Greek keyboard in Settings > General > Keyboard > Keyboards > Add New Keyboard > Greek. Then switch to it and tap the appropriate key.
• Android: Install a Greek keyboard from the Play Store, or long-press the "o" key on Gboard to see symbol options (varies by device).

Omega in Physics and Mathematics

The omega symbol is enormously important in science and engineering:

• Electrical Resistance (Capital Ω): The capital omega (Ω) is the SI unit of electrical resistance, named after Georg Simon Ohm. When you see a resistor rated at 100 Ω, it means 100 ohms of resistance.
• Angular Velocity (Lowercase ω): In physics, lowercase omega represents angular velocity — how fast something rotates, measured in radians per second.
• Angular Frequency: Related to angular velocity, ω = 2πf, where f is the frequency in hertz. This appears constantly in wave mechanics and signal processing.
• Set Theory: In set theory and logic, ω is used to represent the smallest infinite ordinal number.
• Complex Analysis: The Omega constant is a specific mathematical constant related to the Lambert W function.

Omega in Other Fields

Beyond physics and math, omega appears in many other areas:

• Watchmaking: Omega SA is one of the most famous luxury watch brands in the world, founded in Switzerland in 1848. The brand uses the Ω symbol as its logo.
• Nutrition: Omega-3, omega-6, and omega-9 fatty acids are essential nutrients. The "omega" refers to the position of the first double bond in the carbon chain, counted from the omega (last) carbon.
• Finance: The omega ratio is a risk-return performance measure used in portfolio management.
• Fraternities and Sororities: Many Greek-letter organizations use omega in their names, such as Omega Psi Phi.

Omega vs. Ohm — Are They the Same Symbol?

The capital omega (Ω) and the ohm sign (Ω) look nearly identical but are technically different Unicode characters. The ohm sign is at U+2126, while capital omega is U+03A9. In practice, most fonts render them identically, and Unicode normalization converts U+2126 to U+03A9. For all practical purposes, you can use Ω (U+03A9).

Interesting Facts About the Omega Symbol

• Omega is the only Greek letter that gave its name to a luxury brand (Omega watches) recognized worldwide.
• The "alpha and omega" concept has been used in everything from theology to branding to represent totality.
• In the original Greek alphabet (before the classical version), omega did not exist — it was added later as a variation of omicron.
• The lowercase omega (ω) is one of the most frequently used Greek letters in physics textbooks, appearing in equations for everything from pendulums to electromagnetic waves.
• In chemistry, the omega position of a molecule refers to the carbon farthest from the functional group.

Quick Reference Table

Whether you need the omega symbol for a physics paper, a web project, or just to use in a text message, you now have everything you need. Bookmark this page and come back anytime you need to copy Ω or ω.