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Ω

ohm sign

Ohm Sign

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Ω marks electrical resistance in ohms, usually after a number. In Greek or math, Ω is the letter; Unicode treats both as equivalent.

Text symbol

What Ω means

After a number, it gives resistance to electric current.

Telegraph networks needed comparable resistance measurements. The British Association began a practical standard in 1861; the unit was named for physicist Georg Simon Ohm in 1872.

Unicode keeps Ω for compatibility and recommends Ω for new Greek or mathematical text.

Technical and precise; used in resistance values and electronics specifications.

Some software standardizes equivalent text by changing Ω to Ω, erasing their distinction.

Part of collections

Who writes Ω

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What it means when someone sends it to you

2 readings

It gives electrical resistance in ohms.

Don't confuse it with

1

Collections with Ω

1

How to type or find Ω

Search it as
ohms · resistance · resistor value · omega
Shows up in
Anything that takes text · its shape is whatever your font draws
Windows (Word)
⎇Alt+XType 2126, then AltX to get Ω.
Windows
⊞Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win .).
macOS
⌃Control+⌘Command+␣SpaceOpen the character viewer and search “ohm sign”.
Linux
⎈Ctrl+⇧Shift+UType 2126, then Enter or Space.
HTML
Ω
CSS
\2126
Codes and encoding1 code points
HTML decimal
Ω
HTML hex
Ω
CSS content
content: "\2126";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%84%A6
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes

A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

Families this belongs to

2

Typography & punctuation332 symbols

Letters1,265 symbols