Well, they all have 360 degree rotational symmetry :P Sorry, not helpful.
I think these all do: H, I, K(depending on how you write it), N, O, S, X, Z
H, I, O, and X have rotational and reflectional symmetry, and N, S, and X also have rotational.
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H,i,o,x
4
There are 10 letters in the alphabet that achieve rotational symmetry when displayed in their capital form. These letters: A, H, I, M, O, U, V, W, X, and Y.
M w h
H, I, O, X. In some fonts the symmetry may not apply.