Ω
Capital Omega in Mathematics
In Mathematics, the Capital Omega symbol (Ω) is commonly used. Learn how to copy and use it in your technical documents.
Unicode
U+03A9
HTML Entity
Ω
LaTeX Sequence
\capitalomega
Primary Field
MathematicsMathematics Application
Capital Omega is the ohm, the SI unit of electrical resistance, named after Georg Ohm. It also denotes solid angle in geometry and the entire sample space in probability theory.
How to type Omega (capital) (Ω)
- Fastest: click Ω on the keyboard above — it copies to your clipboard, ready to paste into Word, Google Docs, email or a forum.
- Unicode: the code point is shown in the panel above; on Windows you can also use Alt‑X after the hex code in Word.
- LaTeX: use the command shown above inside math mode.
- Anywhere: because it’s standard Unicode, it keeps its exact form across apps and devices.
Frequently asked questions
What is an ohm (Ω)?
The unit of electrical resistance; one ohm passes one ampere under one volt.
What is Ω in probability?
The sample space — the set of all possible outcomes of an experiment.
Write mathematical and scientific expressions
Need to pair this symbol with other operators?