The founder municipalities Feldberg, Bärental, and Altglashütten are represented by the three primary colours red, white, and blue. The blue also most likely represents the connection to the former House of Fürstenberg (Swabia). The meaning of the three discs leaves room for speculation. They are either reminiscent of glass spheres and glaziers or of the three lakes that meet within the boundary of Feldberg: Titisee, Windgfällweiher und Schluchsee. They could also symbolize the unity of the three communities.