HTML Entity for Combining Plus Sign Below

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+031F

What You'll Learn

How to display the combining plus sign below (U+031F) in HTML using hexadecimal, decimal, and CSS escape methods. This is a combining diacritical mark—it attaches below the preceding base character (e.g. ) and is used in IPA, linguistics, and specialized notation.

Render it with ̟ or ̟ immediately after a base letter. There is no named HTML entity. Do not confuse U+031F with U+00B1 (±, plus-minus) or U+002B (+, plus sign)—those are standalone symbols, not combining marks.

⚡ Quick Reference — Combining Plus Sign Below

Unicode U+031F

Combining Diacritical Marks

Hex Code ̟

Hexadecimal reference

HTML Code ̟

Decimal reference

Named Entity

Use numeric codes only

Reference Table
Name           Value
────────────   ──────────
Unicode        U+031F
Hex code       ̟
HTML code      ̟
Named entity   (none)
CSS code       \031F
Meaning        Combining plus sign below
Usage          Place after base letter: a̟
Related        U+00B1 = plus-minus (±)
               U+002B = plus sign (+)
               U+032A = combining bridge below
Block          Combining Diacritical Marks (U+0300–U+036F)
1

Complete HTML Example

A simple example showing the combining mark on letter a using hex, decimal, and CSS content:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point::after{
   content: "a\031F";
  }
 </style>
</head>
<body>
<p>Plus below (hex): a&#x031F;</p>
<p>Plus below (decimal): a&#799;</p>
<p>Plus below (CSS): <span id="point"></span></p>
</body>
</html>
Try it Yourself

🌐 Browser Support

The combining plus sign below is widely supported in all modern browsers when paired with a base character:

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

👀 Live Preview

See the combining plus sign below attached to base letters:

On letter a
On letter x
Standalone (orphan) ̟ (no base—may render oddly)
Not the same as Plus-minus ±  |  Plus +
Numeric refs a&#x031F;   a&#799;   a\031F

🧠 How It Works

1

Hexadecimal Code

&#x031F; uses Unicode hex 031F. Place it immediately after a base character: a&#x031F;.

HTML markup
2

Decimal HTML Code

&#799; uses decimal 799 for the same combining mark: a&#799;.

HTML markup
3

CSS Entity

\031F in CSS content works with a base letter: content: "a\031F";.

CSS stylesheet
=

Combining mark result

All three methods produce when paired with base a. Unicode U+031F in Combining Diacritical Marks (U+0300–U+036F).

Use Cases

The combining plus sign below (U+031F) is commonly used in:

🗣 IPA Notation

Phonetic transcriptions requiring a plus diacritic below a letter.

📄 Linguistics

Academic papers and language documentation with specialized diacritics.

🎓 Education

Phonology and orthography courses teaching combining mark usage.

📋 Unicode References

Character tables and entity guides for combining diacritical marks.

📝 Technical Writing

Notation guides explaining how combining characters attach to base glyphs.

💻 Web Typography

Sites publishing phonetic or dialectology content with proper Unicode.

♿ Accessibility

Provide plain-language descriptions; combining marks may read oddly in screen readers.

💡 Best Practices

Do

  • Place &#x031F; or &#799; immediately after the base letter
  • Use content: "a\031F" in CSS when generating combined glyphs
  • Set <meta charset="utf-8"> for reliable rendering
  • Pick one numeric style per project for consistency
  • Test with the fonts used in your linguistic or academic content

Don’t

  • Use U+031F alone expecting a visible plus sign—it needs a base character
  • Confuse combining plus below with ± (U+00B1) or + (U+002B)
  • Use padded notation like U+0031F—the correct value is U+031F
  • Use CSS \031F in HTML text nodes without a base letter
  • Assume all fonts render combining marks identically—test your typeface

Key Takeaways

1

Two HTML numeric references plus CSS for U+031F

&#x031F; &#799;
2

Always pair with a base letter: a&#x031F; → a̟

3

Unicode U+031F — COMBINING PLUS SIGN BELOW

4

No named entity—use hex, decimal, or CSS with a base character

5

Previous: Plus Minus (±)   Next: Pluto (♇)

❓ Frequently Asked Questions

Place U+031F immediately after the base character: a&#x031F; (hex) or a&#799; (decimal). The combining mark renders a plus below the preceding letter.
U+031F (COMBINING PLUS SIGN BELOW). Combining Diacritical Marks block. Hex 031F, decimal 799.
No. U+031F is a combining diacritic placed below a base letter. U+00B1 (±) is a standalone PLUS-MINUS SIGN. They are different code points with different uses.
In IPA and linguistic notation, phonetic transcriptions, academic texts, and Unicode references where a plus diacritic below a letter is required.
Named HTML entities cover a subset of common characters. U+031F uses numeric hex or decimal codes or CSS escapes, which is standard for combining diacritical marks.

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

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