HTML Entity for Addressed To Subject (℁)

Beginner
⏱️ 5 min read
📚 Updated: May 2026
🎯 1 Code Example
Unicode U+2101
HTML Entity for Addressed To Subject symbol (℁) tutorial illustration

What You'll Learn

How to display the addressed to subject symbol (℁) in HTML using numeric character references. Unicode names this character Addressed to the Subject; it is a letterlike abbreviation used in formal correspondence and subject lines.

The character lives in the Letterlike Symbols Unicode block (U+2101). There is no named HTML entity for ℁, so you use ℁ or ℁ in markup, or \2101 in CSS content on pseudo-elements.

⚡ Quick Reference — Addressed To Subject Entity

Unicode U+2101

Letterlike Symbols block

Hex Code ℁

Hexadecimal reference

HTML Code ℁

Decimal reference

CSS Code \2101

Use in CSS content

Reference Table
Name           Value
────────────   ──────────
Unicode        U+2101
Hex code       ℁
HTML code      ℁
Named entity   (none)
CSS code       \2101
1

Complete HTML Example

This example shows the addressed to subject symbol (℁) using hexadecimal code, decimal HTML code, and a CSS content escape on a pseudo-element:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\2101";
  }
 </style>
</head>
<body>

<p>Addressed To Subject using Hexa Decimal: &#x2101;</p>
<p>Addressed To Subject using HTML Code: &#8449;</p>
<p id="point">Addressed To Subject using CSS Entity: </p>

</body>
</html>
Try It Yourself

🌐 Browser Support

Numeric references for U+2101 are supported in all modern browsers. Final appearance depends on font coverage for the Letterlike Symbols block:

Chrome 1+
Firefox 1+
Safari 1+
Edge 12+
Opera 4+
Android 4.4+
iOS Safari 1+

👀 Live Preview

See the addressed to subject symbol rendered in typical contexts:

Inline text Re: Contract review — ℁ Finance Committee (subject line style).
Large glyph ℁
Formal abbreviation Memo header: ℁ All department heads…
Monospace REF: CORR-℁-2026-014
Font note If the primary font lacks Letterlike Symbols, the browser picks a fallback that includes ℁.

🧠 How It Works

1

Hexadecimal Code

&#x2101; references Unicode 2101 in hexadecimal. The x prefix marks a hex numeric character reference.

HTML markup
2

Decimal HTML Code

&#8449; is the decimal code point 8449 for the same character—often used when authors think in decimal Unicode values.

HTML markup
3

CSS Entity (Escape)

\2101 is the CSS escape (four hex digits) used in content on ::before / ::after to emit ℁ without placing the raw character in HTML.

CSS stylesheet
=

Same visual result

All methods render ℁. Unicode is U+2101 (Letterlike Symbols, U+2100–U+214F). There is no standard named HTML entity; stick to numeric references or CSS escapes.

✅

Use Cases

The addressed to subject symbol (℁) fits these kinds of content:

📝 Memos & Letters

Formal correspondence where the standard letterlike abbreviation replaces spelled-out “addressed to the subject”.

📑 Legal & Official Text

Filings, notices, and templates that follow traditional typography for routing or subject blocks.

📧 Email & Subject Lines

Rare but valid when reproducing legacy notation or style guides that specify this glyph.

📋 Forms & PDFs

Digitized paper forms that preserve the original abbreviation for fidelity.

🏛️ Institutional Sites

Archives or intranets mirroring printed correspondence conventions.

📚 Typography References

Educational pages demonstrating Letterlike Symbols alongside ℀, ℃, and similar characters.

🎨 Design Systems

When a single glyph matches brand or print guidelines better than plain words.

💡 Best Practices

Do

  • Use UTF-8 and one numeric style (hex or decimal) consistently
  • Pair ℁ with visible context so readers understand the abbreviation
  • Prefer &#x2101; or &#8449; when generating HTML from code
  • Test with your real body and heading fonts for Letterlike coverage
  • Use \2101 only in CSS content, not inside HTML text nodes

Don’t

  • Assume every custom webfont includes U+2101
  • Use the symbol alone as the only label for a critical action
  • Mix hex and decimal references at random in one template
  • Paste CSS escapes into HTML markup (they belong in stylesheets)
  • Confuse ℁ with ℀ (account of, U+2100) or other letterlike symbols

Key Takeaways

1

Two HTML numeric references render ℁

&#x2101; &#8449;
2

In CSS, use the escape in content on pseudo-elements

\2101
3

Unicode U+2101 is in the Letterlike Symbols block (U+2100–U+214F)

4

There is no named HTML entity for this character—use numeric references

5

Explain the abbreviation on first use so readers and assistive tech understand ℁

❓ Frequently Asked Questions

Use &#x2101; (hex), &#8449; (decimal), or \2101 in CSS content. All produce ℁. There is no standard named entity.
U+2101 (hex 2101, decimal 8449). Unicode names it Addressed to the Subject; it sits in the Letterlike Symbols block.
When reproducing formal correspondence, memos, or style guides that call for this abbreviation instead of spelling out “addressed to the subject”.
HTML numeric references (&#8449; or &#x2101;) go in markup. The CSS escape \2101 belongs in stylesheets, usually in the content property of ::before or ::after. Same glyph, different layers.
Named entities cover a limited set of characters. Letterlike symbols like ℁ are normally written with hex or decimal numeric references, which is what HTML and XML processors expect for this block.

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About the author

Mari Selvan M P
Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

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