HTML Entity for Combining Square Below (̻)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+033B

What You'll Learn

How to display the Combining Square Below (̻) in HTML and CSS. This character is U+033B (COMBINING SQUARE BELOW) in the Combining Diacritical Marks block (U+0300–U+036F)—a nonspacing mark that attaches below the preceding base character. For example, a̻ renders as a̻.

There is no named HTML entity for U+033B. Use ̻, ̻, or \033B in CSS content. Do not confuse this combining mark with math symbols like square cap U+2293 (⊓).

⚡ Quick Reference — Combining Square Below

Unicode U+033B

Combining Diacritical Marks

Hex Code ̻

Hexadecimal reference

HTML Code ̻

Decimal reference

Named Entity

Use numeric codes only

Reference Table
Name           Value
────────────   ──────────
Unicode        U+033B
Hex code       ̻
HTML code      ̻
Named entity   (none)
CSS code       \033B
Type           Combining mark (below)
Example        a̻ → a̻
Block          Combining Diacritical Marks (U+0300–U+036F)
1

Complete HTML Example

A simple example showing ̻ using hexadecimal and decimal references, combining with a base letter, plus a CSS content escape (no named entity):

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point::after{
   content: "\033B";
  }
 </style>
</head>
<body>
<p>Square below (hex): &#x033B;</p>
<p>Square below (decimal): &#827;</p>
<p>With letter a: a&#x033B;</p>
<p id="point">Square below (CSS): </p>
</body>
</html>
Try it Yourself

🌐 Browser Support

The Combining Square Below (̻) is supported in modern browsers when paired with a base character:

Chrome1+
Firefox1+
Safari3.1+
Edge12+
Opera4+
Android4.4+
iOS Safari3.2+

👀 Live Preview

See the combining square below in linguistic contexts:

Mark alone ̻
With base letter a̻   n̻   x̻
Notation Phonetic mark a̻ in transcription
Not the same as Square cap ⊓ (U+2293, math symbol)
Numeric refs &#x033B; &#827; \033B

🧠 How It Works

1

Hexadecimal Code

&#x033B; references code point U+033B using hex digits 033B. Place immediately after the base character.

HTML markup
2

Decimal HTML Code

&#827; is the decimal equivalent (827) for the same combining mark.

HTML markup
3

CSS Entity

\033B is the CSS escape for U+033B, used in the content property of pseudo-elements.

CSS stylesheet
=

Combining result

Place after a base letter: . Unicode U+033B in Combining Diacritical Marks (U+0300–U+036F). No named entity.

Use Cases

The Combining Square Below (̻) commonly appears in:

💬 Linguistic notation

Dictionaries and language docs with specialized diacritical marks.

📝 Phonetic transcription

IPA and research notation modifying base characters.

📚 Academic papers

Scholarly content on orthography and phonology.

🏫 Educational content

Tutorials explaining combining diacritical marks.

📄 Technical documentation

Character-set and Unicode encoding references.

🔤 Entity demos

Examples showing numeric references for U+033B.

💡 Best Practices

Do

  • Place &#x033B; or &#827; immediately after the base letter
  • Use a&#x033B; pattern for combined glyphs like a̻
  • Set <meta charset="utf-8"> for reliable rendering
  • Pick hex or decimal consistently across a document
  • Test with fonts that support Combining Diacritical Marks

Don’t

  • Write U+0033B—the correct notation is U+033B
  • Use CSS \0033B with extra padding—prefer \033B
  • Confuse U+033B (combining mark) with U+2293 (square cap ⊓)
  • Expect a named HTML entity for U+033B
  • Put CSS escape \033B in HTML text nodes without a base character

Key Takeaways

1

Three ways to reference U+033B in HTML and CSS

&#x033B; &#827;
2

For CSS stylesheets, use \033B in the content property

3

U+033B COMBINING SQUARE BELOW — attaches below base letters

4

No named entity—use numeric references after the base character

5

Previous: Spherical Angle   Next: Square Cap

❓ Frequently Asked Questions

Use &#x033B; (hex), &#827; (decimal), or \033B in CSS content. Place the mark immediately after the base letter (e.g. a&#x033B;). There is no named HTML entity.
U+033B (COMBINING SQUARE BELOW). Combining Diacritical Marks (U+0300–U+036F). Hex 033B, decimal 827.
For linguistic notation, phonetic transcription, technical documentation, academic papers, educational content, and scientific publications that need a square mark below a base character.
HTML code (&#827; or &#x033B;) goes in markup after the base character. CSS entity \033B is used in stylesheets, typically in the content property of pseudo-elements like ::before or ::after.
Named HTML entities cover ASCII, Latin-1, and common symbols. Combining diacritical marks like U+033B use numeric hex or decimal references—standard practice for this Unicode block.

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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.

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