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In use in Wikidata for lexemes [1].
For the autonym, see e.g. the Nynorsk Wikipedia's Høgnorsk version of the page
about Høgnorsk [1]. I've followed the same format as Bokmål and Nynorsk for
consistency.
[1] 548ead57fa/WikibaseLexeme.mediawiki-services.php (L27)
[2] https://nn.wikipedia.org/wiki/Hn/H%C3%B8gnorsk