If you're wondering what the circles, triangles, and squares are supposed to represent in Squid Game, we have an article just ...

The square, triangle, and circle reflect the hierarchical structure and ranks of the workers in the environment where the game is played. These symbols are like Sony PlayStation control buttons ...

Square refers to a piece of paper; I had it represent menus or documents and made it pink. The circle and X represent ‘yes’ or ‘no’ decision-making and I made them red and blue respectively.