Those signs differ from country to country, but the design is very similar. In Germany this sign looks like this https://de.wikipedia.org/wiki/Verkehrsberuhigt

Those signs differ from country to country, but the design is very similar. In Germany this sign looks like this https://de.wikipedia.org/wiki/Verkehrsberuhigter_Bereich#/media/File:Zeichen_325.1_-_Beginn_eines_verkehrsberuhigten_Bereichs,_StVO_2009.svg https://de.wikipedia.org/wiki/Verkehrsberuhigter_Bereich#/me... The official meaning is "begining of a traffic calming area" (verkehrsberuhigter Bereich) but most people call it "Spielstraße" (literal translation "street for playing"). I don't know if the sign was designed after the common term for those streets or vice versa.