HTML Entity for Uppercase O Stroke Acute (Ǿ)

Beginner
5 min read
Updated: Sep 2026
1 example
Unicode U+01FE

What Is Uppercase O Stroke Acute?

Uppercase O stroke acute (Ǿ) is the Unicode character at U+01FE in Latin Extended-B. Official name: LATIN CAPITAL LETTER O WITH STROKE AND ACUTE — a capital Ø with an acute accent above, used in Faroese and linguistic notation.

Remember
Character     Ǿ
Unicode       U+01FE
Hex entity    Ǿ
Decimal       Ǿ
CSS escape    \01FE
Named entity  (none)
Not the same  Ø · Ó · ǿ

Prefer Ǿ or Ǿ in HTML markup. You can also type Ǿ in UTF-8. There is no named entity. For the lowercase letter, use U+01FF (ǿ).

Quick Reference

One table for every form you will actually use.

FormCodeWhere it goes
Direct characterǾHTML text (UTF-8)
Hex entityǾHTML markup (preferred)
Decimal entityǾHTML markup
CSS escape\01FEStylesheet content
Named entity—Not defined in HTML5
Lowercase (related)ǿ (U+01FF)Numeric only

When to Use Which

SituationUse
Capital O with stroke and acute (Ǿ)Ǿ or Ǿ
Lowercase o with stroke and acute (ǿ)ǿ (ǿ)
Capital O with stroke only (Ø)Ø (Ø)
Capital O with acute only (Ó)Ó (Ó)
Capital O with tilde (Õ)Õ (Õ)
Generated text via ::before / ::aftercontent: "\01FE"

Live Preview

Uppercase O stroke acute rendered alone and next to related letters.

Large glyph Ǿ
Notation Glyph: Ǿ
Compared Ǿ  |  Ø  |  Ó  |  ǿ
Hint Compare: Both Ǿ | Stroke Ø | Acute Ó | Lower ǿ
With entities Hex: Ǿ | Decimal: Ǿ

Complete HTML Example

One page that shows the letter with hex, decimal, CSS escape, and a typed character. Use View Output or open the live editor.

Hex + Decimal + CSS + Typed

Four ways to produce Ǿ, plus a short comparison note.

html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Uppercase O Stroke Acute (Ǿ)</title>
  <style>
    #point::after {
      content: "\01FE";
    }
  </style>
</head>
<body>
  <p>Using Hex Code: &#x1FE;</p>
  <p>Using HTML Code: &#510;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Typed directly: Ǿ</p>
  <p lang="fo">Not Ø (stroke only) or Ó (acute only)</p>
</body>
</html>
Try It Yourself

How It Works

1. Hex: U+01FE → &#x1FE; in HTML. The browser turns it into Ǿ.

2. Decimal: same code point as 510 → &#510;. Same result as hex.

3. CSS: use \01FE in content (not an HTML entity). #point::after appends that Ǿ after the paragraph text.

4. Typed / compare: paste Ǿ in UTF-8. Keep Ø (stroke only) and Ó (acute only) as separate characters.

Pitfalls & Tips

Common mistakes when working with U+01FE.

Named

No &O…; name

HTML5 has no named entity for U+01FE. Use &#x1FE; or &#510; — do not invent a name.

vs Ø

Not stroke alone

Ø (&Oslash;) has the diagonal stroke but no acute. Ǿ needs both marks.

vs Ó

Not acute alone

Ó (&Oacute;) is Ó with no stroke. Do not swap the two.

vs ǿ

Case matters

Ǿ is capital. ǿ is lowercase. Use the matching code point for each case.

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

\01FE belongs in CSS strings. &#x1FE; / &#510; belong in HTML.

A11y

Use real language context

When Ǿ appears in Faroese text, keep surrounding text and lang accurate (for example lang="fo").

Browser Support

Uppercase O stroke acute (U+01FE) and its entity forms (&#x1FE;, &#510;, CSS \\01FE) are supported in all mainstream browsers. Latin Extended-B glyphs are available in modern system fonts.

✓ Universal support

Uppercase O Stroke Acute (&#x01FE;)

Encode with hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.

100% Browser coverage
Google Chrome Supported
Yes
Microsoft Edge Supported
Yes
Mozilla Firefox Supported
Yes
Apple Safari Supported
Yes
Opera Supported
Yes
Internet Explorer All versions
Yes
U+01FE Full support

Bottom line: Prefer &#x1FE; or &#510; in HTML. Use \\01FE only inside CSS content. Do not confuse with Ø (stroke only) or Ó (acute only).

Key Takeaways

  • Unicode: uppercase O stroke acute is U+01FE (decimal 510) — glyph Ǿ.
  • HTML: use &#x1FE; or &#510; — no named entity in HTML5.
  • CSS: use \01FE inside content for generated text.
  • Meaning: Ǿ is both marks — not Ø (stroke only), not Ó (acute only), not ǿ (lowercase).

One line: U+01FE → &#x1FE; / &#510; / CSS \01FE.

Frequently Asked Questions

Use &#x1FE; (hex), &#510; (decimal), type Ǿ directly in UTF-8, or the CSS escape \01FE in content. There is no named HTML entity for U+01FE.
U+01FE (LATIN CAPITAL LETTER O WITH STROKE AND ACUTE). Hex 1FE, decimal 510. It belongs to Latin Extended-B (U+0180–U+024F).
No. HTML5 does not define a named entity for this character. Use numeric forms &#510; or &#x1FE;.
No. Ǿ is O with both stroke and acute (U+01FE). Ø is stroke only (&Oslash;, U+00D8). Ó is acute only (&Oacute;, U+00D3).
Use it for Faroese and linguistic text that needs capital Ǿ as one precomposed letter — not as a substitute for plain Ø or Ó.
HTML entities (&#510; or &#x1FE;) go in markup. The CSS escape \01FE goes in stylesheet strings (usually content on ::before/::after).

Did you know?

Uppercase O stroke acute (Ǿ) is Unicode U+01FE (decimal 510) — LATIN CAPITAL LETTER O WITH STROKE AND ACUTE in Latin Extended-B. HTML5 has no named entity — use &#x1FE; or &#510;. Lowercase is U+01FF (ǿ). Combines the Danish/Norwegian stroke Ø with an acute accent. Do not confuse with plain stroke Ø (&Oslash;) or acute-only Ó (&Oacute;).

Next: Uppercase O Tilde

Learn the HTML entity for uppercase O with tilde (U+00D5).

Continue tutorial →

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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