The letter O has rotational symmetry on the order of one, because after being rotated by 90 degrees, it still looks the same. Letters can also have lines of symmetry, either vertically or horizontally. Examples of letters with a vertical line of symmetry include: A, H, I, M, O, T, U, V, W, X and Y.
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The letters H and Z have both line symmetry and rotational symmetry
F has no symetry : line or rotational symmetry
An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
H, I, O, and X have rotational symmetry.
Yes. An ellipse (oval) has two lines of symmetry, but not a rotational symmetry. A parabola has one line and no rotation.