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It refers to symmetry about a straight line.
Rotational symmetry refers to symmetry of the figure when it is rotated about a single point in the same plane. Lines of symmetry apply to reflections. You do not have lines of rotational symmetry.
Four * * * * * If the question refers to an octagon, rather than an octogan, it can have 8 lines of symmetry although it need not have any.
Magnitude refers to the size of a mathematical object. The greater an object's volume, area, or length, the greater its magnitude. The magnitude of a number is referred to as its "absolute value."