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.
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H,I,O,X,
As with the Roman alphabet, which you may be familiar with it (since you are using it to read this answer), different letters have different symmetries.
H, M, N Kind of U (because the line curves at the end) If it doesn't have to be all the way vertical... A, V, W, X, Y
H
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