Mask Squid Game the three icons — square, triangle, and circle — reflect the hierarchical structure of the environment that the contestants find themselves in. Square represents the guards, the highest-rank staff on the show. People wearing masks with square shapes oversee other players. Additionally, each guard's face is covered by a mask with either a circle, triangle, or square. These shapes denote the guard's rank and responsibility. The guards with the circles are the lowest rank.