a ninety degree turn :)
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A capital N has no lines of symmetry (nor semetry).
Infinity Actually, The group of symmetries of a circle has elements of every finite order, as well as elements of infinite order. Each rotation of degree 360 / n , for some natural number n has an order of n.
The letters with half turn symmetry in the alphabet are.......H, I, N, O, S, X, and Z.
E , f , h , i, Z, U, , N
H, I, N, O, S, X, Z H, I, N, O, S, X, Z H, I, N, O, S, X, Z H, I, N, O, S, X, Z