A regular decagon,
A icosagon (20-gon) with sides of lengths a,b,a,b,a,b,.. units and angles of measure x,324-x,x,324-x,... degrees,
and so on.
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not all shapes have lines of symmetry. one example is a triangle.
A square has 4 lines of symmetry
trianglessquaresrectanglesgeneral starsoctagonshexagonspentagons
Three dimensional shapes, generally, don't have lines of symmetry, but a circle has an infinite number is symmetry lines. 3D shapes also don't have rotational symmetry either, but a circle has an infinite number of that as well.
Most of them.