I need look into the usage of a particular shape/design, and I really need to know what its called - if it has a name - before I can even search for it. Heres a quick sketch: So, its formed from a circle, and overlaid with a square with the length of the sides equal to the radius of the circle, so that the corner of the square is at the centre of the circle. However, Its not in any of the lists of geometric shapes that Ive seen, maybe because its not a geometric shape with an equation to produce it. Does anyone know if theres a name for this shape? Many thanks.