P and R.
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A regular octagon has 8 lines of symmetry. See the Related Link below that includes a diagram of an octagon with the lines of symmetry drawn. A non-symmetrical octagon may have between 0-4 lines of symmetry.
As capital letters: F, G, J, L, N, P, Q, R, S, and Z have no axis of symmetry. As lower case letters: a (depending on how you write it), b, d, e, f, g, h, j, k, m and n (again, depends on how you write them specifically) p, q, r, s, y, and z are non-symmetrical.
A non-repetitive pattern.
A circle is non-polygon. Meaning it has a curved side. A circle has no sides. It is non-regular.
flat & non-flat