HTML Entity for Undertie (‿)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+203F

HTML Entity for Undertie (‿) tutorial illustration

Definition

What Is the Undertie Entity?

Undertie (‿) is the Unicode character at U+203F in the General Punctuation block (official name: UNDERTIE). It is a lower connector used in linguistic notation and phonetic transcription to link characters below the baseline.

Remember

Character     ‿
Unicode       U+203F
Hex entity    &#x203F;
Decimal       &#8255;
CSS escape    \203F
Named entity  (none)

All of these produce the same glyph: ‿. Prefer underscore or hyphen for everyday text; use ‿ when you specifically need this undertie mark.

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Direct character	`‿`	HTML text (UTF-8)
Hex entity	`‿`	HTML markup
Decimal entity	`‿`	HTML markup
CSS escape	`\203F`	Stylesheet `content`
Named entity	—	Not defined in HTML5

When to Use Which

Situation	Use
Need the undertie glyph ‿	Type `‿`, or `‿` / `‿`
Generated text via `::before` / `::after`	`content: "\203F"`
ASCII underscore / snake_case	Use _ (`U+005F`)
Upper character-tie mark	Use ⁀ (`U+2040`)
Looking for `&undertie;` or similar	Does not exist for U+203F — use numeric form

See it

Live Preview

Undertie rendered in common writing contexts.

Inline text a‿b‿c

Large glyph ‿

Compared ‿ _ ⁀

Monospace mark ‿ → undertie

With entities Hex: ‿ | Decimal: ‿

Code

Complete HTML Example

One page that shows Undertie with the hex entity, decimal entity, CSS escape, and a typed character. Use View Output or open the live editor.

Hex + Decimal + CSS + Typed

All four ways to produce ‿ in a single document.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Undertie (‿) in HTML</title>
  <style>
    #point::after {
      content: "\203F";
    }
  </style>
</head>
<body>
  <p>Undertie using Hex Code: &#x203F;</p>
  <p>Undertie using HTML Code: &#8255;</p>
  <p id="point">Undertie using CSS Entity: </p>
  <p>Typed directly: ‿</p>
  <p>Linguistic: a&#x203F;b&#x203F;c</p>
</body>
</html>

Try It Yourself

How It Works

1. Hex: U+203F → ‿ in HTML. The browser turns it into ‿.

2. Decimal: same code point as 8255 → ‿. Same result as hex.

3. CSS: use \203F in content (not an HTML entity). #point::after appends that ‿ after the paragraph text.

4. Typed ‿: fine in UTF-8 pages. The linguistic line shows undertie linking letters in sequence.

Pitfalls & Tips

Common mistakes when working with Undertie entities.

Named?

No named entity

HTML5 does not define &undertie; for U+203F. Use numeric forms.

Look-alikes

‿ ≠ _ ≠ ⁀

‿ is U+203F. Underscore _ is U+005F. Character tie ⁀ is U+2040.

CSS vs HTML

Do not mix escapes

\203F belongs in CSS. ‿ / ‿ belong in HTML.

Fonts

Check the glyph

General Punctuation coverage varies. If ‿ is missing, explain the connection in nearby text.

Semicolon

End references

Always finish with ; — write ‿, not &#8255.

Use

Specialized only

Most everyday pages do not need ‿. Prefer _ or - for normal joining.

Compatibility

Browser Support

Undertie (U+203F) and its numeric entity forms (‿, ‿, CSS \\203F) are supported in all mainstream browsers. Glyph shape depends on the font.

✓ Universal support

Undertie (‿)

Encode with hex, decimal, or CSS escape — or paste ‿ in UTF-8 HTML.

100% Browser coverage

Google Chrome Supported

Yes

Microsoft Edge Supported

Yes

Mozilla Firefox Supported

Yes

Apple Safari Supported

Yes

Opera Supported

Yes

Internet Explorer All versions

Yes

U+203F / entities Full support

Bottom line: Use ‿ or ‿ for the Unicode glyph, and \\203F only inside CSS content. Prefer _ for ordinary underscores.

Remember

Key Takeaways

Unicode: undertie is U+203F (decimal 8255).
HTML: use ‿ or ‿ when you need an entity.
CSS: use \203F inside content for generated text.
Watch out: ‿ ≠ _ ≠ ⁀ (undertie ≠ underscore ≠ character tie).

One line: U+203F → ‿ / ‿ / CSS \203F, or paste ‿.

Frequently Asked Questions

How do I display Undertie (‿) in HTML?

Use ‿ (hex), ‿ (decimal), or the CSS escape \203F in the content property. All render ‿. You can also paste ‿ directly when your file is UTF-8.

What is the Unicode value for Undertie?

U+203F (hex 203F, decimal 8255). Unicode names it UNDERTIE. It belongs to the General Punctuation block (U+2000–U+206F).

Is there a named HTML entity for ‿?

No. HTML5 does not define a named entity for ‿. Use numeric references like ‿ or ‿.

How is ‿ different from _ and ⁀?

‿ (U+203F) is undertie — a lower punctuation connector. _ (U+005F) is the ASCII underscore / low line. ⁀ (U+2040) is character tie, a related mark that sits higher.

What is the difference between HTML code and CSS entity for ‿?

HTML entities (‿ or ‿) go in markup. The CSS escape \203F is used in stylesheets (usually in the content property of ::before/::after). Both render ‿.

When should I use ‿?

Use it in linguistic notation, phonetic transcription, or specialized typography when you need this exact undertie glyph. Prefer underscore or hyphen for everyday text.

Did you know?

Undertie is Unicode U+203F (decimal 8255) — official name UNDERTIE in the General Punctuation block. HTML5 has no named entity. It is a lower connector used in linguistic and phonetic notation, and is not the ASCII underscore (U+005F _) or character tie (U+2040 ⁀).

Next: Union

Learn the HTML entity for Union (∪) — next in this sequence.

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About the author

Mari Selvan M P 🔗

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Experience 12 years building web and cloud systems
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