H and I and N and O and S and X and Z ( all 180 %) O (90 %)
all letters 360 % A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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A figure has rotational symmetry when it can rotate onto itself in less than a full rotation.
Depending on the font, they are N, S and Z.
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 Q N r Y
I, H, N, O, S, X & Z all have rotational symmetry.