Blauwe Knoop voor een studentenvereniging

Blue insigna for a student association.

Teetotalers were recognisable by their blue insigna, in Holland a Blue Knot. It originates from the Bible: Numbers 15:37: Speak unto the children of Israel, and bid them that they make them fringes in the borders of their garments throughout their generations, and that they put upon the fringe of the borders a ribband of blue: