Ohm Sign
Part of Math Symbols
Ohm Sign has no standard Windows Alt code. Copy the character directly, or use its HTML entity or Unicode value instead.
- Alt code
- None
- HTML entity
- Ω
- Unicode
- U+2126
About this symbol
Ω, the ohm sign, is the unit of electrical resistance, named after the German physicist Georg Simon Ohm, who published his law linking voltage, current and resistance in 1827. The engineer William Henry Preece suggested the omega in 1867 for its sound. Unicode keeps a separate ohm sign only for older character sets; its notes say to use the Greek Ω.
Unicode facts
- Official name
- OHM SIGN
- Type
- Uppercase letter
- Unicode block
- Letterlike Symbols
- Added in
- Unicode 1.1 (1993)
- Unicode notes
- SI unit of resistance, named after G. S. Ohm, German physicist
- Preferred representation is 03A9
Click the symbol or any value at the top of the page to copy it. See the full Math Symbols chart for related characters.