A triangle.
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An equilateral triangle has 3 lines of symmetry
A circle is symmetric about ANY diameter. The number of possible diameters of the same circle is infinite. And on the same principle, a sphere will have lines of symmetry in every direction in 3 dimensions.
An equilateral triangle has 3 lines of symmetry
An equilateral triangle
A circle or sphere has an infinite number of lines of symmetry.