HIOSXZ
I, O, S, H, Z, X, N
just by quickly looking at my keys this is what I got? I added N because if you take the midpoint in the middle line. (downward stroke) then rotate what is on the right of it 180 degrees. you get the the rest of the N
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E s i o
H, I, O, and X have rotational symmetry.
7 have rot
Mississippi
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.