H, I, O, and X have rotational symmetry.
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7 have rot
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ALL letters have at least one line of rotational symmetry. However - if you mean reflective symmetry, the letters F, G, J, L, P, Q, R, S, & Z do not.
The letters H and Z have both line symmetry and rotational symmetry
H, I, N, S, X and Z. I make that 6, not 3! And O has 180 degree symmetry and more!