Any shape which, when rotated through 180 degrees appears to be the same as the original.
twofold doubleheader
Cemetery. There is no "a" in the word."
a heart have no rotational symmetry!
A trapezium does not have rotational symmetry.
The twofold purpose of the chivalric code was to fuse the religious and fighting spirits and to bring the fighting man in accord with Christian theory.
It has 8 rotational symmetry.
It has 8lines of rotational symmetry
It has rotational symmetry to the order of 2
Equilateral triangles have rotational symmetry.
A trapezoid has no rotational symmetry.
A kite does not have rotational symmetry.