Blue signs are part of Oslo's cityscape and were established by the Society for Oslo Byes Well in the late 1980s. The purpose of the signs is to convey cultural history in short form, and they provide information about historical places and events in the city. The signs are easily recognizable and help to preserve and promote local cultural heritage.
After the first blue signs were put up in Oslo, there has been a growing interest in implementing similar measures in other parts of the country. There has been collaboration with municipalities, associations and teams to distinguish Norwegian cultural history. In connection with the Constitution Jubilee in 2014, over 300 electoral churches from 1814 were signposted in collaboration with the National Archives and the National Archives. In addition, Helseforetaket Sykehusbygg uses blue signs to mark listed buildings within the health sector. Today, blue signs can be found in all parts of the country, which shows the project's prevalence and importance for cultural communication in Norway.