ICANN Acronyms and Terms
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Second-Level Label Generation Rules Reference(Second-Level LGR Reference)
A set of Label Generation Rules for a particular language or script, which has been reviewed for linguistic, security, and stability considerations and formally published as a reference for second-level domain names.
Second-Level LGR References are made available on the ICANN website. Top-level domains can adopt these LGRs as is or use them as the basis for further modifications.