Depending on the font, they are N, S and Z.
I, H, N, O, S, X & Z all have rotational symmetry.
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
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