Lowercase u with double acute (ű) is the Latin Extended-A character at Unicode U+0171 (LATIN SMALL LETTER U WITH DOUBLE ACUTE). Two acute marks sit above the letter. Essential in Hungarian orthography. HTML5 defines the named entity ű.
Remember
Character ű
Unicode U+0171
Named entity ű
Hex entity ű
Decimal ű
CSS escape \0171
All of these produce the same glyph: ű. Prefer ű or a pasted ű in UTF-8 pages; use numeric or CSS forms when you need them.
Reference
Quick Reference
One table for every form you will actually use.
Form
Code
Where it goes
Direct character
ű
HTML text (UTF-8 default)
Named entity
ű
HTML markup (readable choice)
Hex entity
ű
HTML markup
Decimal entity
ű
HTML markup
CSS escape
\0171
Stylesheet content
When to Use Which
Situation
Use
Hungarian / UTF-8 text
Type or paste ű
Readable entity in HTML source
ű
Numeric entity required
ű or ű
Generated text via ::before / ::after
content: "\0171"
ú (single acute) or ü (umlaut)
Different characters — see Related Topics
See it
Live Preview
Lowercase u with double acute rendered in common contexts.
Hungarianűrhajó
Large glyphű
Case pairŰ ű
With entitiesNamed: ű | Hex: ű | Decimal: ű
Not the sameú (ú) · ü (ü)
Code
Complete HTML Example
One page that shows lowercase u with double acute with named, hex, decimal, and CSS forms. Use View Output or open the live editor.
Named + Hex + Decimal + CSS
Four ways to produce ű in a single document.
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Lowercase U Double Acute (ű) in HTML</title>
<style>
#point::after {
content: "\0171";
}
</style>
</head>
<body>
<p>U Double Acute using Named Entity: ű</p>
<p>U Double Acute using Hex Code: ű</p>
<p>U Double Acute using HTML Code: ű</p>
<p id="point">U Double Acute using CSS Entity: </p>
</body>
</html>
U Double Acute using Named Entity: ű
U Double Acute using Hex Code: ű
U Double Acute using HTML Code: ű
U Double Acute using CSS Entity: ű
How It Works
1. Named:ű is the HTML5 named entity for U+0171. Clearest form in HTML source.
2. Hex:U+0171 → ű in HTML. Same glyph as named.
3. Decimal: same code point as 369 → ű. Same result.
4. CSS: use \0171 in content (not an HTML entity). #point::after appends that ű after the paragraph text.
Pitfalls & Tips
Common mistakes when working with the u double acute entity.
Named
Prefer ű
HTML5 defines a named entity for this letter — use it for readable HTML.
CSS vs HTML
Do not mix escapes
\0171 belongs in CSS. ű / ű / ű belong in HTML.
Look-alikes
Not ú or ü
Single acute ú is U+00FA; umlaut ü is U+00FC. Double acute is a different diacritic.
Case
ű vs Ű
Uppercase is U+0170 (Ű) — a different code point from U+0171.
Semicolon
End references
Always finish with ; — write ű, not &udblac.
UTF-8
Declare charset
If you paste ű directly, serve the page as UTF-8 with <meta charset="UTF-8">.
Compatibility
Browser Support
Lowercase u with double acute (U+0171) and its entity forms (ű, ű, ű, CSS \\0171) are supported in all mainstream browsers.
✓ Universal support
Lowercase U Double Acute (ű)
Use ű, paste ű, or encode with hex, decimal, or CSS escape — same glyph everywhere.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+0171 / entitiesFull support
Bottom line: Prefer ű or a pasted ű in UTF-8 text. Use ű / ű when a numeric form is required, and \\0171 only inside CSS content.
Remember
Key Takeaways
Unicode: u with double acute is U+0171 (decimal 369), Latin Extended-A.
HTML: prefer ű, or use ű / ű.
CSS: use \0171 inside content for generated text.
Use: Hungarian ű — not the same as ú or ü.
One line:U+0171 → ű, or ű / ű / CSS \0171.
Frequently Asked Questions
Use ű (named), ű (hex), ű (decimal), or the CSS escape \0171 in the content property. All render ű. In UTF-8 files you can also type or paste ű directly.
U+0171 (LATIN SMALL LETTER U WITH DOUBLE ACUTE). Hex 0171, decimal 369. It belongs to Latin Extended-A and is used in Hungarian orthography.
Yes. HTML5 defines ű for this character. You can also use numeric references ű or ű.
Use it for Hungarian text, linguistic examples, CSS-generated content, or when encoding must be explicit. Prefer ű when you want a readable named form in HTML source.
HTML entities (ű, ű, or ű) go in markup. The CSS escape \0171 is used in stylesheets (usually in the content property of ::before/::after). Both render ű.
Plain u is U+0075. ú (U+00FA, ú) has one acute. ü (U+00FC, ü) has diaeresis. ű (U+0171) has a double acute — a distinct Hungarian letter. Do not substitute one for another.
🤔
Did you know?
Lowercase u with double acute (ű) is Unicode U+0171 (decimal 369) in Latin Extended-A. HTML5 defines the named entity ű — also usable as ű or ű. Essential in Hungarian (e.g. űrhajó).
