HTML Entity for Uppercase O Slash (Ø)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+00D8

HTML Entity for uppercase O slash (U+00D8) tutorial illustration

Definition

What Is Uppercase O Slash?

Uppercase O slash (Ø) is the Unicode character at U+00D8 in Latin-1 Supplement. Official name: LATIN CAPITAL LETTER O WITH STROKE — a capital O with a diagonal stroke, used as a letter in Danish, Norwegian, and Faroese.

Remember

Character     Ø
Unicode       U+00D8
Named entity  &Oslash;  (capital O)
Hex entity    &#xD8;
Decimal       &#216;
CSS escape    \00D8
Not the same  ø · ∅ · Ö

Prefer Ø in HTML markup — the capital O in the name matters. Numeric forms and typing Ø in UTF-8 also work. For the lowercase letter, use ø (ø).

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`Ø`	HTML markup (preferred)
Direct character	`Ø`	HTML text (UTF-8)
Hex entity	`Ø`	HTML markup
Decimal entity	`Ø`	HTML markup
CSS escape	`\00D8`	Stylesheet `content`
Lowercase (related)	ø (U+00F8)	Named `ø`

When to Use Which

Situation	Use
Capital O with stroke (Ø)	`Ø` or type `Ø`
Lowercase o with stroke (ø)	ø (`ø`)
Capital O with stroke and acute (Ǿ)	Ǿ
Capital O with diaeresis (Ö)	Ö (`Ö`)
Empty set (math symbol ∅)	`∅` — not a letter Ø
Generated text via `::before` / `::after`	`content: "\00D8"`

See it

Live Preview

Uppercase O slash rendered alone and next to related letters.

Large glyph Ø

Notation Øresund

Compared Ø | ø | Ö | ∅

Hint Compare: Stroke Ø | Lower ø | Diaeresis Ö | Empty set ∅

With entities Named: Ø | Hex: Ø | Decimal: Ø

Code

Complete HTML Example

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

Named + Hex + Decimal + CSS + Typed

Five ways to produce Ø, plus a short Danish place name.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Uppercase O Slash (Ø)</title>
  <style>
    #point::after {
      content: "\00D8";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: &Oslash;</p>
  <p>Using Hex Code: &#xD8;</p>
  <p>Using HTML Code: &#216;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Typed directly: Ø</p>
  <p lang="da">Danish: &Oslash;resund</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: Ø (capital O) is the clearest HTML form for U+00D8. Lowercase ø is a different character (ø).

2. Hex: U+00D8 → Ø in HTML. Same glyph as the named entity.

3. Decimal: same code point as 216 → Ø. Same glyph as hex and named.

4. CSS: use \00D8 in content (not an HTML entity). #point::after appends that Ø after the paragraph text.

5. Typed / word: paste Ø in UTF-8, or write Øresund with lang="da".

Pitfalls & Tips

Common mistakes when working with U+00D8.

Case

Ø ≠ ø

Ø → Ø (capital). ø → ø (lowercase). Entity names are case-sensitive.

vs ∅

Not the empty set

∅ (U+2205) is a math symbol. Ø is a letter. Use the letter for names and language text.

vs Ö

Not a diaeresis

Ö (Ö) is Ö with two dots. Ø has a stroke through the O.

vs O/

Not two ASCII characters

Typing O/ is not the same as one precomposed letter. Prefer Ø.

Encoding

Keep UTF-8 declared

Latin-1 letters display reliably with <meta charset="UTF-8">. Prefer named entities when encoding is uncertain.

CSS vs HTML

Do not mix escapes

\00D8 belongs in CSS strings. Ø / Ø / Ø belong in HTML.

A11y

Use real language context

When Ø appears in Danish or Norwegian words, keep surrounding text and lang accurate (for example lang="da" or lang="no").

Compatibility

Browser Support

Uppercase O slash (U+00D8) and its entity forms (Ø, Ø, Ø, CSS \\00D8) are supported in all mainstream browsers. Latin-1 glyphs are standard in system fonts.

✓ Universal support

Uppercase O Slash (Ø)

Encode with named, 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+00D8 / Ø Full support

Bottom line: Prefer Ø (capital O) in HTML. Use \\00D8 only inside CSS content. Do not confuse with ø (ø) or empty set ∅.

Remember

Key Takeaways

Unicode: uppercase O slash is U+00D8 (decimal 216) — glyph Ø.
HTML: prefer Ø (capital O) — also Ø / Ø.
CSS: use \00D8 inside content for generated text.
Meaning: Ø is capital stroke — not ø (ø), not Ö (diaeresis), not ∅ (empty set).

One line: U+00D8 → Ø / Ø / Ø / CSS \00D8.

Frequently Asked Questions

How do I display Ø in HTML?

Use Ø (named), Ø (hex), Ø (decimal), type Ø directly in UTF-8, or the CSS escape \00D8 in content. Prefer Ø in normal HTML.

What is the Unicode value for uppercase O slash?

U+00D8 (LATIN CAPITAL LETTER O WITH STROKE). Hex D8, decimal 216. It belongs to Latin-1 Supplement (U+0080–U+00FF).

Is there a named HTML entity for U+00D8?

Yes. Use Ø (capital O). Numeric forms Ø and Ø also work. Note: ø (lowercase) is a different letter (ø).

Is Ø the same as ø or ∅?

No. Ø is U+00D8 (Ø, capital stroke). ø is U+00F8 (ø). ∅ is the empty-set symbol (U+2205), not a letter.

When should I use Ø?

Use it for Danish, Norwegian, Faroese, and other text that needs capital Ø — for example Øresund or Øst — not as a substitute for O or empty set ∅.

What is the difference between HTML code and CSS entity for U+00D8?

HTML entities (Ø, Ø, or Ø) go in markup. The CSS escape \00D8 goes in stylesheet strings (usually content on ::before/::after).

Did you know?

Uppercase O slash is Unicode U+00D8 (decimal 216) — glyph Ø in Latin-1 Supplement (U+0080–U+00FF). HTML5 names it Ø (capital O). Official name: LATIN CAPITAL LETTER O WITH STROKE. Lowercase is ø (ø, U+00F8). Essential in Danish, Norwegian, and Faroese. Do not confuse with empty set ∅ (U+2205) or diameter sign ⌀ (U+2300).

Next: Uppercase O Stroke Acute

Learn the HTML entity for uppercase O with stroke and acute (U+01FE).

Continue tutorial →

About the author

Mari Selvan M P 🔗

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