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  • Recommended Scripts – 29 modern scripts (and other common/inherited scripts) with widespread customary use amongst large communities. The 28 scripts ICANN has been working on for the Maximal Starting Repertoire (MSR) come from here. ICANN has been working with various script communities on Root Zone Label Generation Rules (RZ-LGR; more on this later) for these scripts.
  • Excluded Scripts – 94 historic/obsolete scripts that are not in customary modern use and should be excluded from use in identifiers. Some of them also have unresolved architectural issues that make them unsuitable as identifiers. Scripts here include Coptic, Egyptian Hieroglyphs etc.
  • Limited Use Scripts – 34 modern scripts in relatively limited use compared to Recommended Scripts, e.g. Balinese, Canadian Aboriginal Syllabics, Cherokee, Javanese etc. To avoid security issues, Unicode recommends that some implementations may wish to disallow Limited Use scripts in identifiers.

The Public Comment Proceeding
The main question of the Public Comment is which other scripts out of the 159 might be suitable for ICANN to support apart from the initial 28 for the MSR. Here, ICANN had engaged with Unicode and IDN experts to review UAX#31 in the context of IDNs. The resulting analysis and recommendations were published in the report, “Evaluating Unicode Scripts for Use in IDNs”, which proposes that:

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