 Knudsen was also influenced by and a proponent of the common Dano-Norwegian movement for phonemic orthography.The written form of Norwegian based on his work eventually became known as "Riksmål", a term introduced by the author Bjørnstjerne Bjørnson in 1899.The prefix "riks" is used in words denoting "belonging to a (or the) country"; Riksmål means "state language".