Panel Four Squares Metal Sign

About the Four Squares design

Each quarter of this panel holds a white square boxed inside two black square bands, and short black bridges cross the gap between the bands at the middle of every side, splitting it into four white corner brackets. Where the four units meet, the leftover space opens into a stubby white cross at the dead center. A dashed border of short white slots runs just inside the heavy black frame, and at each corner the slots turn as neat L shapes.