Danish orthography

Danish orthography is the system and norms used for writing the Danish language, including spelling and punctuation.

Officially, the norms are set by the Danish language council through the publication of Retskrivningsordbogen.

Danish currently uses a 29-letter Latin-script alphabet, identical to the Norwegian alphabet, with an additional three letters: Æ, Ø and Å.

Source: https://en.wikipedia.org/wiki/Danish_orthography

Note - there's been changes.