in OSM there is the county (fylke) Trøndelag(4) #406567 with ISO3166-2=NO-50. But there is a discrepance between https://en.wikipedia.org/wiki/ISO_3166-2:NO and https://no.wikipedia.org/wiki/ISO_3166-2:NO
https://en.wikipedia.org/wiki/ISO_3166-2:NO → Trøndelag with NO-50
https://no.wikipedia.org/wiki/ISO_3166-2:NO → Sør-Trøndelag with NO-16 and Nord-Trøndelag with NO-17
http://www.statoids.com/uno.html → there are Sør-Trøndelag and Nord-Trøndelag
https://www.iso.org/obp/ui/#iso:code:3166:NO → there are Sør-Trøndelag and Nord-Trøndelag
Conclusion by me: OSM is wrong. Trøndelag(4) has to be split in north/south. But i can’t do that, because of missing knowledge. I need local help. After that i will change the wrong Wikipedia-Pages in all languages.
walter aka wambacher / germany
btw: i i’m wrong, please give me details.