From the moment Squid Game drops its first masked soldier onto the screen, the symbols on their faces demand attention. Circle, triangle, and square. They’re simple, geometric, and eerily familiar.

But many people would not be able to tell you what the triangle ... A square with a filled black circle in the middle means 'tumble dry with no heat'. As with the washing symbol, a drying symbol ...

But many people would not be able to tell you what the triangle symbol on a clothes label ... through represents 'do not dry', and a square with a circle in the middle (so that it looks like ...