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.
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.
Mississippi
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.
Depending on the font, they are N, S and Z.
M w h
H, I, O, X. In some fonts the symmetry may not apply.
E s i o
Yes, the capital letter N has rotational symmetry but no lines of symmetry:
The letters H and Z have both line symmetry and rotational symmetry
H, I, O, and X have rotational symmetry.
H, I, N, O, S, X, and Z