Wikipedia
Överste
Överste ( eversti in Finnish) is an officer rank in Finland and Sweden, immediately above överstelöjtnant ( everstiluutnantti) and below brigadgeneral (prikaatikenraali). It literally means "the highest" and has originally been a rank for regiment commanders. In Finland, brigades are also commanded by holders of this rank. It is the highest rank below general officers.
Finnish Defense Forces rank of Eversti is comparable to Ranks of NATO armies officers as OF-5