As defined by Kyrmse, a canonical polygon is a closed polygon whose vertices lie on a point lattice and whose edges consist of vertical and horizontal steps of unit length or diagonal steps (at angles which are multiples of 45° with respect to the lattice axes) of length sqrt(2). In addition, no two steps may be taken in the same direction, no edge intersections are allowed, and no point may be a vertex of two edges. The numbers of distinct canonical polygons of n = 1, 2, ... sides are 0, 0, 1, 3, 3, 9, 13, 52, 140, 501, 1763, 6786, 25571, ... (OEIS A052436). There are exactly eight distinct convex canonical polygons, illustrated above. The concept can also be generalized to diagonals rotated with respect to the lattice axes.

canonical polyhedron | golygon | lattice polygon