Latin capital upsilon (Ʊ) is the Unicode character at U+01B1 in Latin Extended-B. Official name: LATIN CAPITAL LETTER UPSILON — used in African orthographies, phonetic notation, and linguistics. It is not the Greek letter Υ.
Remember
Character Ʊ
Unicode U+01B1
Hex entity Ʊ
Decimal Ʊ
CSS escape \01B1
Named entity (none)
Not the same Υ · ʊ · Y
Prefer Ʊ or Ʊ in HTML markup. You can also type Ʊ in UTF-8. There is no named entity. For the related IPA small letter, see upsilon small (U+028A).
Using Hex Code: Ʊ
Using HTML Code: Ʊ
Using CSS Entity: Ʊ
Typed directly: Ʊ
Not Greek Υ (Υ)
How It Works
1. Hex:U+01B1 → Ʊ in HTML. The browser turns it into Ʊ.
2. Decimal: same code point as 433 → Ʊ. Same result as hex.
3. CSS: use \01B1 in content (not an HTML entity). #point::after appends that Ʊ after the paragraph text.
4. Typed / compare: paste Ʊ in UTF-8. Keep Greek Υ (Υ) as a separate character.
Pitfalls & Tips
Common mistakes when working with U+01B1.
Named
No Latin named entity
HTML5 has no named entity for U+01B1. Use Ʊ or Ʊ. Do not confuse with Υ (that is Greek).
vs Υ
Not Greek upsilon
Υ (Υ, U+03A5) is Greek. Ʊ is Latin Extended-B — different scripts and uses.
vs ʊ
Not the IPA small
ʊ (U+028A) is LATIN SMALL LETTER UPSILON in IPA Extensions — the near-close near-back rounded vowel. Use it for IPA, not as a drop-in lowercase of U+01B1 in every orthography.
vs Y
Not the letter Y
ASCII Y is a different letter. Latin upsilon has its own horseshoe-like shape.
Encoding
Keep UTF-8 declared
Latin Extended-B letters display reliably with <meta charset="UTF-8">. Prefer numeric entities when encoding is uncertain.
CSS vs HTML
Do not mix escapes
\01B1 belongs in CSS strings. Ʊ / Ʊ belong in HTML.
A11y
Say Latin, not Greek
When Ʊ appears in examples, label it as Latin / phonetic so screen-reader users are not steered toward Greek upsilon.
Compatibility
Browser Support
Latin capital upsilon (U+01B1) and its entity forms (Ʊ, Ʊ, CSS \\01B1) are supported in all mainstream browsers. Latin Extended-B glyphs are available in modern system fonts.
✓ Universal support
Upsilon (Ʊ)
Encode with hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+01B1Full support
Bottom line: Prefer Ʊ or Ʊ in HTML. Use \\01B1 only inside CSS content. Do not confuse with Greek Υ (Υ).
Remember
Key Takeaways
Unicode: Latin capital upsilon is U+01B1 (decimal 433) — glyph Ʊ.
HTML: use Ʊ or Ʊ — no named entity in HTML5.
CSS: use \01B1 inside content for generated text.
Meaning:Ʊ is Latin — not Greek Υ (Υ), not IPA ʊ, not Y.
One line:U+01B1 → Ʊ / Ʊ / CSS \01B1.
Frequently Asked Questions
Use Ʊ (hex), Ʊ (decimal), type Ʊ directly in UTF-8, or the CSS escape \01B1 in content. There is no named HTML entity for U+01B1.
U+01B1 (LATIN CAPITAL LETTER UPSILON). Hex 1B1, decimal 433. It belongs to Latin Extended-B (U+0180–U+024F).
No. HTML5 does not define a named entity for this character. Use numeric forms Ʊ or Ʊ.
No. Ʊ is a Latin letter (U+01B1). Greek capital upsilon is U+03A5 and uses Υ. They look related but are different characters.
Use it for African orthographies, phonetic notation, or linguistic text that needs Latin capital Ʊ — not as a substitute for Greek Υ or IPA small ʊ.
HTML entities (Ʊ or Ʊ) go in markup. The CSS escape \01B1 goes in stylesheet strings (usually content on ::before/::after).
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Did you know?
Latin capital upsilon (Ʊ) is Unicode U+01B1 (decimal 433) — LATIN CAPITAL LETTER UPSILON in Latin Extended-B. HTML5 has no named entity — use Ʊ or Ʊ. It is not Greek capital upsilon Υ (Υ, U+03A5). The related IPA small form is U+028A (ʊ). Used in African orthographies, phonetic notation, and linguistics.
