HTML Entity for Upsilon (Ʊ)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+01B1
HTML Entity for Upsilon tutorial illustration

What You'll Learn

How to display the Latin capital letter upsilon (Ʊ) in HTML using hexadecimal, decimal, and CSS escape methods. This character is U+01B1 (LATIN CAPITAL LETTER UPSILON) in the Latin Extended-B block—a Latin letter shaped like an upsilon, used in some African orthographies and phonetic notation. It is not the Greek letter Υ (U+03A5, Υ).

Render it with Ʊ, Ʊ, or CSS escape \01B1. There is no named HTML entity for this character. The related IPA small form is ʊ (U+028A). Do not confuse Ʊ with Greek Υ (U+03A5), plain U (U+0055), or Vietnamese horn letters.

⚡ Quick Reference — Upsilon Entity

Unicode U+01B1

Latin Extended-B

Hex Code Ʊ

Hexadecimal reference

HTML Code Ʊ

Decimal reference

Named Entity —

No named entity

Reference Table
Name           Value
────────────   ──────────
Unicode        U+01B1
Hex code       Ʊ
HTML code      Ʊ
Named entity   (none)
CSS code       \01B1
Meaning        Latin capital letter upsilon
Also called    Latin upsilon
Related        U+028A = ʊ (upsilon small, IPA)
               U+03A5 = Υ (Greek upsilon, Υ)
Block          Latin Extended-B (U+0180–U+024F)
1

Complete HTML Example

A simple example showing the Latin capital upsilon (Ʊ) using hexadecimal code, decimal HTML code, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\01B1";
  }
 </style>
</head>
<body>
<p>Symbol (hex): &#x01B1;</p>
<p>Symbol (decimal): &#433;</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>
Try It Yourself

🌐 Browser Support

The Latin capital upsilon (Ʊ) is supported in modern browsers when the font includes Latin Extended-B glyphs:

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

👀 Live Preview

See the Latin capital upsilon (Ʊ) and how it differs from related characters:

Large glyphƱ
Unicode nameLatin capital letter upsilon
IPA small formʊ (U+028A) — Latin small letter upsilon
Greek upsilonΥ (U+03A5) — &Upsilon;  |  υ (U+03C5) — &upsilon;
Not the same asplain U (U+0055)  |  Ư (U horn)  |  Ơ (O horn)
Numeric refs&#x01B1; &#433; \01B1

🧠 How It Works

1

Hexadecimal Code

&#x01B1; uses the Unicode hexadecimal value 01B1 to display the character. The x prefix indicates hexadecimal format.

HTML markup
2

Decimal HTML Code

&#433; uses the decimal Unicode value 433 to display the same character. A common method for Latin Extended-B characters.

HTML markup
3

CSS Entity

\01B1 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: Ʊ. Unicode U+01B1 sits in Latin Extended-B. Do not confuse with Greek U+03A5 (Υ, &Upsilon;) or IPA ʊ (U+028A). Use fonts with extended Latin support for reliable rendering.

✅

Use Cases

The Latin capital upsilon (Ʊ) is commonly used in:

🌍 African orthographies

Some African language writing systems use Ʊ as a distinct vowel letter in romanization.

📝 Phonetic notation

Linguistic and phonetic transcription alongside the IPA small form ʊ.

🔤 Linguistics

Academic papers, dictionaries, and character charts for extended Latin letters.

📄 Academic content

Unicode reference pages and scholarly publications requiring accurate Ʊ representation.

🌐 Digital humanities

Encoded texts and multilingual archives with Latin Extended-B characters in HTML.

🎨 Typography

Font specimens and design references showcasing Latin Extended-B letters.

⚙ Programmatic HTML

When building HTML from linguistic data, using &#433; or &#x01B1; guarantees correct output.

💡 Best Practices

Do

  • Serve pages as UTF-8; you can type Ʊ directly in UTF-8 source
  • Use numeric references (&#x01B1; or &#433;) when escaping is required
  • Use \01B1 in CSS content when generating the symbol via pseudo-elements
  • Use fonts that support Latin Extended-B characters
  • Distinguish Ʊ (Latin upsilon) from Greek Υ (&Upsilon;)

Don’t

  • Use Ʊ when you need Greek upsilon Υ (&Upsilon;, U+03A5)
  • Substitute plain U when Ʊ is required for correct orthography
  • Confuse Ʊ (Latin upsilon) with ʊ (IPA small upsilon) or horn letters
  • Use the old incorrect CSS escape \001B1—the correct value is \01B1
  • Expect a named HTML entity—none exists for Ʊ

Key Takeaways

1

Type Ʊ directly, or use hex/decimal references

&#x01B1; &#433;
2

For CSS stylesheets, use the escape in the content property

\01B1
3

Unicode U+01B1 — LATIN CAPITAL LETTER UPSILON

4

Not Greek Υ; IPA small form is ʊ (U+028A)

5

Previous: Uppercase Z Stroke (Ƶ)   Next: Upsilon Small (ʊ)

❓ Frequently Asked Questions

Use &#x01B1; (hex), &#433; (decimal), or \01B1 in CSS content. There is no named HTML entity. In UTF-8 you can also type Ʊ directly.
U+01B1 (LATIN CAPITAL LETTER UPSILON). Latin Extended-B block. Hex 01B1, decimal 433. Related IPA form is U+028A (ʊ). Not the same as Greek U+03A5 (Υ, &Upsilon;).
For African orthographies, phonetic and linguistic notation, academic character references, and any content requiring the Latin capital upsilon letter.
No. Ʊ (U+01B1) is LATIN CAPITAL LETTER UPSILON in Latin Extended-B. Υ (U+03A5) is GREEK CAPITAL LETTER UPSILON with named entity &Upsilon;. They look similar but are different Unicode characters with different code points.
No. Use &#433; or &#x01B1; in HTML, or \01B1 in CSS.

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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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Uppercase Z Stroke (Ƶ) Upsilon Small