Looped Square - Wikipedia

The most common theory is that the sign must represent a castle or fortress. Although some say it is a four-leaf clover or a cloverleaf (highway junction). So we cannot say with certainty the origin. What we do know is that Susan Kare did not discover the symbol while on vacation. This is sometimes claimed, but as we mentioned earlier, Susan just c

The valknut is a symbol consisting of three interlocked triangles. It appears on a variety of objects from the archaeological record of the ancient Germanic peoples. The term valknut is derived from the modern era, and the term or terms used to refer to the symbol during its historical employment is unknown.

In Norwegian heraldry a Bowen knot is called a valknute (valknut) and the municipal coat of arms of Lødingen from 1984 has a femsløyfet valknute which means a Bowen knot with five loops.[3]

This sign was mainly found along the road in Scandinavian countries. Finland started doing so in 1950 and then neighboring countries such as Sweden took over. When you came across this sign, you knew there was a landmark or campground nearby.