Ω
Ohm Sign
- Unicode
- U+2126
- Category
- Math
- HTML Entity
- Ω
- CSS
- \2126
The Ohm sign (Ω) represents the standard unit of electrical resistance in physics and electronics. While it looks identical to the Greek capital letter Omega, Unicode originally encoded it as a distinct symbol for legacy technical compatibility, though modern text standards recommend using the standard Greek Omega (Ω) instead. You will commonly see it on electrical schematics, multimeter dials, and engineering documentation.
How to Type
- Windows
- Alt+8486
- macOS
- Option+Z (types equivalent Greek Omega)
- Linux
- Ctrl+Shift+U then 2126
- HTML
- Ω
In Programming
This symbol appears in electronic design automation (EDA) tools, SPICE simulations, and UI labels representing electrical resistance. However, most modern programming environments and linters recommend normalizing it to the standard Greek Omega (U+03A9) to prevent string comparison bugs.
Tags
SI unit
circuit symbol
electrical
electrical engineering
electrical resistance
electronics schematic
greek omega
mathematics
multimeter
ohm symbol
omega
omega letter
physics
physics unit
resistance
unit of resistance