smoothed octagon
region in the plane conjectured to have the lowest maximum packing density of the plane of all centrally symmetric convex shapes
en-GB/ˈsmuːðd ˈɒktəɡən/
en-US/ˈsmuðd ˈɑktəˌɡɑn/
region in the plane conjectured to have the lowest maximum packing density of the plane of all centrally symmetric convex shapes