A sphere.
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Any regular polygon has 3 (or more) lines of symmetry.
A square is on example. The perpendicular bisectors of the sides and the two diagonals comprie four lines of symmetry.
A symmetrical shape is a mirror image of a shape when a line is drawn through it and some shapes have many lines of symmetry or none at all.
A Heart or a Triangle.
It is an imaginary line that produces a mirror image of a shape which is its line of symmetry