HTML Entity for Radioactive Sign (☢)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+2622
HTML entity for Radioactive Sign (U+2622) — hex, decimal, and CSS tutorial

What You'll Learn

How to display the Radioactive sign (☢) in HTML using hexadecimal, decimal, and CSS escape methods. This character is U+2622 (RADIOACTIVE SIGN) in the Miscellaneous Symbols block (U+2600–U+26FF)—the internationally recognized trefoil symbol for ionizing radiation and nuclear hazards.

Render it with ☢, ☢, or CSS escape \2622. There is no named HTML entity. Do not confuse ☢ with U+2623 (☣, biohazard sign), U+262E (☮, peace symbol), or other warning glyphs in the same Unicode block.

⚡ Quick Reference — Radioactive Sign

Unicode U+2622

Miscellaneous Symbols (U+2600–U+26FF)

Hex Code ☢

Hexadecimal reference

HTML Code ☢

Decimal reference

Named Entity —

Use numeric codes only

Reference Table
Name           Value
────────────   ──────────
Unicode        U+2622
Hex code       ☢
HTML code      ☢
Named entity   (none)
CSS code       \2622
Meaning        Radioactive sign (radiation trefoil)
Related        U+2623 = biohazard sign (☣)
               U+262E = peace symbol (☮)
Block          Miscellaneous Symbols (U+2600–U+26FF)
1

Complete HTML Example

A simple example showing ☢ using hexadecimal code, decimal HTML code, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point::after{
   content: "\2622";
  }
 </style>
</head>
<body>
<p>Radioactive sign (hex): &#x2622;</p>
<p>Radioactive sign (decimal): &#9762;</p>
<p id="point">Radioactive sign (CSS): </p>
</body>
</html>
Try it Yourself

🌐 Browser Support

The Radioactive sign (☢) is widely supported in all modern browsers:

Chrome1+
Firefox1+
Safari1+
Edge12+
Opera4+
Android4.4+
iOS Safari1+

👀 Live Preview

See the Radioactive sign (☢) in safety and warning contexts:

Single symbol ☢
Warning label ☢ Radiation hazard — keep out
Safety notice ☢ Ionizing radiation area
Not the same as Biohazard ☣  |  Peace symbol ☮
Numeric refs &#x2622; &#9762; \2622

🧠 How It Works

1

Hexadecimal Code

&#x2622; uses the Unicode hexadecimal value 2622 to display the radioactive trefoil symbol.

HTML markup
2

Decimal HTML Code

&#9762; uses the decimal Unicode value 9762 for the same character.

HTML markup
3

CSS Entity

\2622 is used in CSS stylesheets in the content property of pseudo-elements for warning icons or decorative markers.

CSS stylesheet
=

Radioactive sign result

All three methods render ☢. Unicode U+2622 in Miscellaneous Symbols. Next: Rams Horn.

✅

Use Cases

The Radioactive sign (☢) is commonly used in:

⚠ Safety warnings

Radiation hazard labels, restricted-area notices, and caution banners.

☢ Nuclear content

Articles on nuclear energy, isotopes, and radiation safety training.

📋 SDS & compliance

Safety data sheets, regulatory docs, and industrial hazard references.

🏥 Medical & lab

Radiology pages, lab equipment guides, and diagnostic imaging content.

🎓 Education

Physics lessons, chemistry labs, and tutorials on ionizing radiation.

♿ Accessibility

Pair ☢ with visible warning text; add aria-label when used as an icon.

💡 Best Practices

Do

  • Use &#x2622; or &#9762; for inline radiation symbols
  • Include clear warning text alongside the symbol
  • Set <meta charset="utf-8"> for reliable rendering
  • Use the correct symbol—☢ not biohazard ☣
  • Pick one numeric style per project for consistency

Don’t

  • Confuse ☢ with biohazard ☣ or peace symbol ☮
  • Use padded Unicode notation like U+02622—the correct value is U+2622
  • Use CSS escape \2622 in HTML text nodes
  • Rely on ☢ alone for critical safety messaging without text
  • Assume every font renders Miscellaneous Symbols identically—test your typeface

Key Takeaways

1

Two HTML numeric references plus CSS for U+2622

&#x2622; &#9762;
2

For CSS stylesheets, use \2622 in the content property

3

Unicode U+2622 — RADIOACTIVE SIGN in Miscellaneous Symbols

4

Distinct from biohazard ☣ and peace symbol ☮

5

Previous: Quotation Mark (")   Next: Rams Horn

❓ Frequently Asked Questions

Use &#x2622; (hex), &#9762; (decimal), or \2622 in CSS content. There is no named entity. All three render ☢.
U+2622 (RADIOACTIVE SIGN). Miscellaneous Symbols block (U+2600–U+26FF). Hex 2622, decimal 9762.
No. ☢ (U+2622) is the RADIOACTIVE SIGN for ionizing radiation. ☣ (U+2623) is the BIOHAZARD SIGN for biological hazards. They are different Unicode characters.
For radiation warnings, nuclear safety content, hazard labels, SDS documentation, medical and industrial safety pages, and educational material about ionizing radiation.
Named HTML entities cover a subset of common characters. U+2622 uses numeric hex or decimal codes or CSS escapes, which is standard for Miscellaneous Symbols.

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About the author

Mari Selvan M P
Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

  • Experience 12 years building web and cloud systems
  • Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

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Quotation Mark (") Rams Horn