A, B, C, D, E, H, I, K, M, O, S, T, U, V, W, X, Y
all have at least one line of symmetry.
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H,I,O,X,
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.
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.
all letters have a line of symmetry
H, I, O, and X have rotational symmetry.