Celtic Square Knot Metal Sign

About the Square Knot design

Two diagonal bands cross at the center, one passing over the other, and each runs out to fold into a sharp triangular loop at a corner. Curved bands trace a circle around that X, but a straight horizontal gap cuts it clean through the middle and leaves an upper and a lower half. Inside each half, smaller arcs weave over and under the diagonals, while the round sides bulge out between the four pointed corners.