HTML Entity for Ohm Sign (Ω)
What You'll Learn
How to display the Ohm sign (Ω) in HTML using hexadecimal, decimal, and CSS escape methods. This symbol denotes the SI unit of electrical resistance (ohm). It appears in circuit diagrams, datasheets, physics textbooks, and electronics documentation (e.g. 100 Ω, 4.7 kΩ).
This character is U+2126 (OHM SIGN) in the Letterlike Symbols block (U+2100–U+214F). Use Ω, Ω, or CSS \2126. There is no named HTML entity for U+2126. Do not confuse with Ω (U+03A9, Greek capital omega)—a related but distinct character.
⚡ Quick Reference — Ohm Sign
U+2126Letterlike Symbols
ΩHexadecimal reference
ΩDecimal reference
—Use numeric codes only
Name Value
──────────── ──────────
Unicode U+2126
Hex code Ω
HTML code Ω
Named entity (none)
CSS code \2126
Meaning Ohm (electrical resistance)
Glyph Ω
Example R = 100 Ω
Related U+2127 = inverted ohm (℧, ℧)
U+03A9 = Greek capital omega (Ω, Ω)
Block Letterlike Symbols (U+2100–U+214F)Complete HTML Example
A simple example showing the Ohm sign (Ω) using hexadecimal code, decimal HTML code, and a CSS content escape. This character has no named HTML entity:
<!DOCTYPE html>
<html>
<head>
<style>
#point::after{
content: "\2126";
}
</style>
</head>
<body>
<p>Ohm Sign (hex): Ω</p>
<p>Ohm Sign (decimal): Ω</p>
<p id="point">Ohm Sign (CSS): </p>
</body>
</html>🌐 Browser Support
The Ohm sign (Ω) is widely supported when fonts include Letterlike Symbols (U+2100–U+214F):
👀 Live Preview
See the Ohm sign (Ω) in electrical and engineering contexts:
Ω)🧠 How It Works
Hexadecimal Code
Ω uses the Unicode hexadecimal value 2126 to display the Ohm sign (Ω).
Decimal HTML Code
Ω uses the decimal Unicode value 8486 for the same character.
CSS Entity
\2126 is used in CSS stylesheets in the content property of pseudo-elements like ::before and ::after.
No Named Entity
U+2126 has no standard &...; named form. Use hex, decimal, or CSS escape only—not Ω, which is U+03A9.
Same visual result
All three methods produce Ω (Ω). Unicode U+2126 is the dedicated ohm unit symbol in Letterlike Symbols.
Use Cases
The Ohm sign (Ω) is commonly used in:
Circuit diagrams, schematics, and resistor value labels (e.g. 100 Ω).
Ohm’s law, impedance, and resistance formulas in tutorials and textbooks.
STEM courses, lab manuals, and interactive electronics learning platforms.
Component specifications listing resistance ranges and tolerances.
Multimeters, simulators, and IoT dashboards showing resistance readings.
Unicode charts, unit pickers, and HTML entity documentation.
Pair Ω with “ohm” or aria-label on first use for screen readers.
💡 Best Practices
Do
- Use
ΩorΩfor the dedicated ohm unit symbol - Use fonts that support Letterlike Symbols (U+2126)
- Set
<meta charset="utf-8"> - Pick one numeric style per project
- Add nearby text or
aria-label(e.g. “100 ohms”) for accessibility
Don’t
- Expect a named HTML entity for U+2126
- Confuse U+2126 (ohm sign) with U+03A9 (
Ω, Greek omega) - Use padded Unicode notation like U+02126—the correct value is
U+2126 - Use CSS
\2126inside HTML text nodes - Mix entity styles randomly in one file
Key Takeaways
Two HTML numeric references plus CSS for U+2126
Ω ΩFor CSS, use \2126 in the content property
Unicode U+2126 — OHM SIGN (SI resistance unit)
Letterlike Symbols block; glyph Ω
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❓ Frequently Asked Questions
Ω (hex), Ω (decimal), or \2126 in CSS content. There is no named entity for U+2126. All methods render Ω when the font supports it.U+2126 (OHM SIGN). Letterlike Symbols block (U+2100–U+214F). Hex 2126, decimal 8486. SI unit symbol for electrical resistance.U+2126 is OHM SIGN (letterlike unit symbol). U+03A9 is GREEK CAPITAL LETTER OMEGA (Ω). They look similar in many fonts but are distinct code points. Use U+2126 for the dedicated ohm unit symbol.Ω or Ω) go in markup. The CSS escape \2126 is used in stylesheets, typically on ::before or ::after. Both render Ω.Explore More HTML Entities!
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