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

# LGR

Label Generation Rules

A formal, machine-readable set of rules that says which characters a label may contain, which labels are valid and which are variants of each other. ICANN's Root Zone LGR applies this to top-level domains and decides which IDN TLD strings and variants can be applied for.

## related terms

- [IDN table](https://tldlog.com/glossary/idn-table/)
- [IDN variant](https://tldlog.com/glossary/idn-variant/)
- [IDN TLD](https://tldlog.com/glossary/idn-tld/)
- [IDN](https://tldlog.com/glossary/idn/)
- [root zone](https://tldlog.com/glossary/root-zone/)