A trademark can be a character, word, or a combination of these,
a number, slogan, sound, smell, or three-dimensional shapes,
A requirement for registering a trademark, is that it should be unlike other brands within the same product group. The trademark may be made public before the application is submitted to the Norwegian Patent Office.
Law on the Protection of Trademarks (Trademarks Act)
More information is available at the Patent Office website on the trademarks page of the website for the Norwegian Patent Office.