HTML Entity for Uppercase A Diaeresis Macron (Ǟ)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+01DE
HTML Entity for Uppercase A Diaeresis Macron tutorial illustration

What You'll Learn

How to display the uppercase A with diaeresis and macron (Ǟ) in HTML using hexadecimal, decimal, and CSS escape methods. This character combines the diaeresis (two dots) and macron (long mark) diacritics and is used in linguistics, phonetic transcription, and some Baltic and Finno-Ugric language orthographies. It is U+01DE in the Latin Extended-B block.

Render it with Ǟ, Ǟ, or CSS escape \1DE. There is no named HTML entity for this character, so numeric codes or CSS must be used.

⚡ Quick Reference — Uppercase A Diaeresis Macron Entity

Unicode U+01DE

Latin Extended-B

Hex Code Ǟ

Hexadecimal reference

HTML Code Ǟ

Decimal reference

Named Entity —

No named entity

Reference Table
Name           Value
────────────   ──────────
Unicode        U+01DE
Hex code       Ǟ
HTML code      Ǟ
Named entity   (none)
CSS code       \1DE
Meaning        Latin capital letter A with diaeresis and macron
Related        U+01DF = lowercase equivalent (ǟ)
Block          Latin Extended-B (U+0180–U+024F)
1

Complete HTML Example

A simple example showing the uppercase A diaeresis macron (Ǟ) using hexadecimal code, decimal HTML code, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\1DE";
  }
 </style>
</head>
<body>
<p>Symbol (hex): &#x1DE;</p>
<p>Symbol (decimal): &#478;</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>
Try it Yourself

🌐 Browser Support

The uppercase A diaeresis macron (Ǟ) renders correctly in modern browsers when UTF-8 is used:

Chrome1+
Firefox1+
Safari1+
Edge12+
Opera4+
Android4.4+
iOS Safari1+

👀 Live Preview

See the uppercase A diaeresis macron (Ǟ) and its references:

Large glyphǞ
DiacriticsDiaeresis (¨) + macron (¯) on A
Case pairǞ (U+01DE) / ǟ (U+01DF)
Not the same asÄ (Ä), Ā (Ā), or plain A
Numeric refs&#x1DE; &#478; \1DE

🧠 How It Works

1

Hexadecimal Code

&#x1DE; uses the Unicode hexadecimal value 1DE to display the character. The x prefix indicates hexadecimal format.

HTML markup
2

Decimal HTML Code

&#478; uses the decimal Unicode value 478 to display the same character. A common method for Latin Extended-B characters.

HTML markup
3

CSS Entity

\1DE is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.

CSS stylesheet
=

Same visual result

All three methods produce the glyph: Ǟ. Unicode U+01DE sits in Latin Extended-B. Lowercase equivalent: U+01DF (ǟ). There is no named HTML entity. Do not confuse with Ä (diaeresis only) or Ā (macron only).

✅

Use Cases

The uppercase A diaeresis macron (Ǟ) is commonly used in:

🔤 Linguistics

Phonetic transcriptions and linguistic descriptions requiring both diaeresis and macron on A.

🌐 Internationalization

Websites and apps for languages that use this character in their orthography.

📚 Language learning

Dictionaries and learning resources showing correct spelling with combined diacritics.

📄 Publishing

Academic, editorial, or scholarly content with precise character encoding.

🎨 Typography

Headlines and styled text in linguistics or language-specific contexts.

🔍 Search & SEO

Correct rendering so specialized linguistic content can be found and indexed.

📝 Transliteration

Romanization systems that use Ǟ to represent a specific sound or letter.

💡 Best Practices

Do

  • Use &#478; or &#x1DE; in HTML (no named entity exists)
  • Serve pages as UTF-8; you can also type Ǟ directly in UTF-8 source
  • Set appropriate lang attributes for language-specific content
  • Use fonts that support Latin Extended-B combined diacritics
  • Distinguish Ǟ from Ä (U+00C4), Ā (U+0100), and plain A (U+0041)

Don’t

  • Assume a named entity exists—there is none for Ǟ
  • Substitute Ä or Ā when Ǟ is required
  • Put CSS escape \1DE in HTML text nodes
  • Assume all fonts render Latin Extended-B combined diacritics
  • Omit UTF-8 encoding on pages with extended Latin characters

Key Takeaways

1

Three references render Ǟ (no named entity)

&#x1DE; &#478;
2

For CSS stylesheets, use the escape in the content property

\1DE
3

Unicode U+01DE — LATIN CAPITAL LETTER A WITH DIAERESIS AND MACRON

4

Used in linguistics, phonetics, and some Baltic / Finno-Ugric orthographies

5

Previous: Uppercase A Circumflex (Â)   Next: Uppercase A Double Grave

❓ Frequently Asked Questions

Use &#x1DE; (hex), &#478; (decimal), or \1DE in CSS content. There is no named HTML entity for this character.
U+01DE (LATIN CAPITAL LETTER A WITH DIAERESIS AND MACRON). Latin Extended-B block. Hex 1DE, decimal 478. Combines diaeresis and macron diacritical marks.
In linguistic and phonetic content, language learning materials, transliteration systems, and internationalized web content. It appears in some Baltic and Finno-Ugric language orthographies.
HTML code (&#478; or &#x1DE;) is used in HTML content. The CSS entity (\1DE) is used in CSS, e.g. in the content property of pseudo-elements. Both produce Ǟ but in different contexts.
No. There is no named HTML entity for Ǟ. Use &#478; or &#x1DE; in HTML, or \1DE in CSS. This is standard for many Latin Extended-B characters.

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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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