HTML Entity for Double Vertical Line Below (͈)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+0348
HTML entity for Combining Double Vertical Line Below (U+0348) tutorial illustration

What You'll Learn

How to display the Combining Double Vertical Line Below (͈) in HTML using hexadecimal, decimal, and CSS entity methods. This character is U+0348 (COMBINING DOUBLE VERTICAL LINE BELOW) in the Combining Diacritical Marks block (U+0300–U+036F)—a combining diacritic used in linguistic notation, phonetic transcription, and specialized typography.

There is no named HTML entity for U+0348. Use ͈, ͈, or \0348 in CSS content. U+0348 typically combines with the preceding character (e.g. a͈). For the spacing character ‖ use U+2016 (‖); for above use U+030E.

⚡ Quick Reference — Double Vertical Line Below

Unicode U+0348

Combining Diacritical Marks

Hex Code ͈

Hexadecimal reference

HTML Code ͈

Decimal reference

Named Entity —

None (use numeric refs)

Reference Table
Name           Value
────────────   ──────────
Unicode        U+0348
Hex code       ͈
HTML code      ͈
Named entity   —
CSS code       \0348
Related        U+2016 = Spacing (|‖); U+030E = Above
1

Complete HTML Example

This example demonstrates the Combining Double Vertical Line Below (͈) using hexadecimal code, decimal HTML code, and a CSS content escape. There is no named HTML entity:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\0348";
  }
 </style>
</head>
<body>
<p>Double Vertical Line Below using Hexadecimal: &#x0348;</p>
<p>Double Vertical Line Below using HTML Code: &#840;</p>
<p id="point">Double Vertical Line Below using CSS Entity: </p>
</body>
</html>
Try it Yourself

🌐 Browser Support

U+0348 is supported in modern browsers when rendered with a font that includes Combining Diacritical Marks:

Chrome 1+
Firefox 1+
Safari 1+
Edge 12+
Opera 4+
Android 4.4+
iOS Safari 3.2+

👀 Live Preview

See the Combining Double Vertical Line Below (͈) in linguistic and phonetic contexts:

Combining a͈   e͈   o͈
Standalone ͈
Related marks U+0348 below   U+030E above   U+2016 spacing
Numeric refs &#x0348; &#840; \0348

🧠 How It Works

1

Hexadecimal Code

&#x0348; uses the Unicode hexadecimal value 0348 to display the Combining Double Vertical Line Below.

HTML markup
2

Decimal HTML Code

&#840; uses the decimal Unicode value 840 to display the same character.

HTML markup
3

CSS Entity

\0348 is used in CSS stylesheets, particularly in the content property of ::before or ::after.

CSS stylesheet
=

Same visual result

All three methods produce U+0348 (͈). Combining Diacritical Marks block. Pairs with a base letter below it (e.g. a͈). Spacing: U+2016 (&Vert;). Above: U+030E.

✅

Use Cases

The Combining Double Vertical Line Below (͈) is commonly used in:

📝 Linguistic notation

Phonetic and phonological features in linguistic texts and academic papers.

🔤 Phonetic transcription

IPA-related notation and pronunciation guides with combining diacritics.

∑ Math & logic

Notation where combining marks stack on base characters.

✎ Typography

Specialized typesetting with double vertical line below as a combining mark under letters.

📚 Language learning

Dictionaries and language apps that need correct diacritical rendering.

🎓 Academic research

Linguistics, phonetics, and language research documents with precise symbols.

💡 Best Practices

Do

  • Use &#x0348; or &#840; for U+0348
  • Use phonetic fonts (Charis SIL, Doulos SIL, Noto Sans) for combining marks
  • Test combining behavior with base letters in target browsers
  • Use UTF-8 (<meta charset="utf-8">) on all pages
  • Use \0348 only inside CSS content

Don’t

  • Assume a named entity exists for U+0348—it does not
  • Confuse U+0348 (combining below) with U+2016 (spacing ‖)
  • Use U+0348 when you need U+030E (above)
  • Expect every font to render combining marks correctly
  • Put CSS escape \0348 in HTML text nodes
  • Forget that U+0348 is a combining character—pair it with base letters

Key Takeaways

1

No named entity—use numeric references

&#x0348; &#840;
2

For CSS stylesheets, use the escape in the content property

\0348
3

Unicode U+0348 COMBINING DOUBLE VERTICAL LINE BELOW

4

Combining mark: pairs with preceding letter (e.g. a͈)

5

Three methods, one glyph — widely supported in modern browsers

❓ Frequently Asked Questions

Use &#x0348; (hex), &#840; (decimal), or \0348 in CSS content. There is no named HTML entity. As a combining mark, place it with a base letter (e.g. a&#x0348;).
U+0348 (COMBINING DOUBLE VERTICAL LINE BELOW). Combining Diacritical Marks block (U+0300–U+036F). Hex 0348, decimal 840.
In linguistic and phonetic notation, phonetic transcription, combining diacritics in math or logic, typography, language-learning content, and academic documents in linguistics or phonetics.
HTML5 named entities do not include U+0348. Use numeric references &#840; or &#x0348;, or the CSS escape \0348 in stylesheets.
HTML numeric references (&#840; or &#x0348;) go in markup. The CSS escape \0348 is used in stylesheets, typically in the content property of pseudo-elements. Both render ͈.

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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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