---
id: "u-label"
kind: "glossary-term"
title: "U-label"
language: "en"
category: "DNS and technical foundations"
updated: "2026-10-04T14:01:23Z"
canonical: "https://tldlog.com/glossary/u-label/"
translations:
  es: "https://tldlog.com/es/glosario/etiqueta-u/"
  de: "https://tldlog.com/de/glossar/u-label/"
  fr: "https://tldlog.com/fr/glossaire/etiquette-u/"
  it: "https://tldlog.com/it/glossario/u-label/"
  pt-BR: "https://tldlog.com/pt/glossario/rotulo-u/"
  ru: "https://tldlog.com/ru/glossariy/u-metka/"
  zh-Hans: "https://tldlog.com/zh/cihui/u-biaoqian/"
---

# U-label

The form of one part of an internationalized domain name as people read and type it, written in Unicode characters such as accented letters, Arabic or Chinese script. Software converts it to the matching A-label, which starts with xn--, before looking it up in the DNS.

## related terms

- [A-label](https://tldlog.com/glossary/a-label/)
- [Punycode](https://tldlog.com/glossary/punycode/)
- [IDN](https://tldlog.com/glossary/idn/)
- [IDNA2008](https://tldlog.com/glossary/idna2008/)
- [Universal Acceptance](https://tldlog.com/glossary/universal-acceptance/)