In addition to und “Undetermined”, ISO 639-2 also includes zxx “No linguistic content; Not applicable”.
Depending on exactly where we want to take this proposal, it could be a better (i.e. less wrong) alternative to use as the locale code that's explicitly defined in ECMA-402.
One benefit that zxx has over und is that the CLDR doesn't provision it at all, while und is used as the code for its root locale, which is defined.
In addition to
und“Undetermined”, ISO 639-2 also includeszxx“No linguistic content; Not applicable”.Depending on exactly where we want to take this proposal, it could be a better (i.e. less wrong) alternative to use as the locale code that's explicitly defined in ECMA-402.
One benefit that
zxxhas overundis that the CLDR doesn't provision it at all, whileundis used as the code for its root locale, which is defined.