Ohm sign (Ω) is the Unicode character at U+2126 in the Letterlike Symbols block. Official name: OHM SIGN. It is the SI unit symbol for electrical resistance (ohm).
Remember
Character Ω
Unicode U+2126
Named entity Ω
Hex entity Ω
Decimal Ω
CSS escape \2126
Not the same Ω · ℧
Prefer Ω in HTML when you want a readable entity, or paste Ω directly in UTF-8. Numeric forms work the same.
Symbol using Named Entity: Ω
Symbol using Hex Code: Ω
Symbol using HTML Code: Ω
Symbol using CSS Entity: Ω
Typed directly: Ω
Example: R = 100Ω
How It Works
1. Named:Ω is the HTML5 name for U+2126 → Ω. Most readable entity form.
2. Hex:U+2126 → Ω in HTML. Same glyph as the named form.
3. Decimal: same code point as 8486 → Ω. Same result as hex and named.
4. CSS: use \2126 in content (not an HTML entity). #point::after appends that Ω after the paragraph text.
5. Typed / example: paste Ω in UTF-8, or write 100Ω for a resistance label.
Pitfalls & Tips
Common mistakes when working with Ohm Sign.
Ω
Not Greek capital omega
Ω is U+03A9 (Greek letter). Use Ω when you want the dedicated ohm unit symbol.
Named
Use Ω
HTML5 defines Ω for U+2126. Prefer it over guessing a name like Ω vs Ω.
A11y
Say “ohm” when needed
On first use, pair the glyph with the word “ohm” or an accessible label so screen-reader users get clear meaning.
CSS vs HTML
Do not mix escapes
\2126 belongs in CSS strings. Ω / Ω / Ω belong in HTML.
Fonts
Check Letterlike coverage
Most modern fonts include Ω, but some UI fonts may fall back. Test critical labels.
Semicolon
End references
Always finish named/numeric forms with ; — write Ω, not &ohm.
Compatibility
Browser Support
Ohm sign (U+2126) and its entity forms (Ω, Ω, Ω, CSS \\2126) are supported in all mainstream browsers. Glyph availability depends on the font.
✓ Universal support
Ohm Sign (Ω)
Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+2126 / entitiesFull support
Bottom line: Prefer Ω or a typed Ω in HTML. Use Ω or Ω when numeric form is required, and \\2126 only inside CSS content.
Remember
Key Takeaways
Unicode: ohm sign is U+2126 (decimal 8486) — glyph Ω.
HTML: use Ω, Ω, Ω, or type Ω.
CSS: use \2126 inside content for generated text.
Meaning:Ω = resistance unit — not Greek Ω (Ω).
Use Ω (named), Ω (hex), Ω (decimal), or the CSS escape \2126 in content. You can also paste Ω directly in a UTF-8 document.
U+2126 (OHM SIGN). Hex 2126, decimal 8486. It belongs to the Letterlike Symbols block (U+2100–U+214F).
Yes. Use Ω. Numeric forms Ω and Ω also work.
Use it for electrical resistance values (100 Ω, 4.7 kΩ) in datasheets, circuit notes, and physics text. Pair with plain-language “ohm” on first use for accessibility when helpful.
HTML entities (Ω, Ω, or Ω) go in markup. The CSS escape \2126 goes in stylesheet strings (usually content on ::before/::after).
No. Ω is U+2126 (ohm sign, Ω). Ω is U+03A9 (Greek capital omega, Ω). They look similar but are different code points. Prefer Ω when you want the dedicated unit symbol.
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Did you know?
Ohm sign is Unicode U+2126 (decimal 8486) — glyph Ω in Letterlike Symbols. HTML5 names it Ω. It is the SI unit symbol for electrical resistance. Distinct from Greek capital omega Ω (U+03A9, Ω), though many fonts draw them similarly.
