Omega Symbol

Ω ω

The omega symbol (Ω / ω) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the omega symbol with one click.

Uppercase Omega Symbol (Ω)

Symbol	Format	Data
Ω	Unicode	U+03A9
Ω	HTML	Ω
Ω	CSS	\03a9
Ω	JavaScript	\u03A9
$\Omega$	TeX	\Omega
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Also known as: omega, uppercase omega, big omega, greek omega, ohm symbol, ohms, sample space symbol, big omega notation, horseshoe symbol.

The Greek capital letter Omega (Ω) denotes the sample space in probability theory, the set of all possible outcomes of a random experiment. In physics and electrical engineering it is the unit symbol for ohms of electrical resistance, and in set theory it can stand for the first uncountable ordinal. Big Omega notation in computer science gives asymptotic lower bounds analogous to big O.

\Omega = \{1, 2, 3, 4, 5, 6\}

Lowercase Omega Symbol (ω)

Symbol	Format	Data
ω	Unicode	U+03C9
ω	HTML	ω
ω	CSS	\03c9
ω	JavaScript	\u03C9
$\omega$	TeX	\omega
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	Image	Download ↓

Also known as: greek omega, lowercase omega, omega letter, angular frequency symbol, w looking letter, curly w, omega sign, first infinite ordinal, angular velocity symbol.

The lowercase Greek letter omega (ω) has many conventional roles in mathematics and science. It denotes angular frequency in oscillations and waves, the first infinite ordinal in set theory, and a primitive root of unity in algebra and number theory. In probability, ω typically represents an individual outcome in a sample space.

x(t) = A \cos(\omega t)

Omega Symbol Alt Codes

On Windows, hold Alt and type the code on the numeric keypad, then release Alt. Num Lock must be on.

Alt Code	Case	Symbol
Alt234	Uppercase	Ω

Codes without a leading zero are legacy OEM codes; they depend on a US English Windows code page.

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Omega Symbol — Ω Greek Capital Letter Omega, ω Greek Small Letter Omega