Depending on the font, they are N, S and Z.
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I, H, N, O, S, X & Z all have rotational symmetry.
I, O, S, H, Z, X, N just by quickly looking at my keys this is what I got?
A figure has rotational symmetry when it can rotate onto itself in less than a full rotation.
A B C D E H K M U V W X Y * * * * * What? Most of these letters do not have rotational symmetry and so cannot have rotational AND line symmetry. Or did the meaning of AND change last night? The only upper case letters with both are H, I, O, X
Z S H and N