is there any difference between lines of symmetry and order of symmetry

yes, there is a difference between lines of symmetry and order of symmetry. lines of symmetry is the no. of times u get the exact shape according to its half. order of symmetry is based on angles it basically means the no. of times you get the same object when u change the angles, say 90. it should be identical to the initial shape. 
example: consider the shape z . it has no line of symmetry but it has 2 order of rotational symmetry. that when u turn the shape 180 degrees then u get the exact same shape. but there is no line of symmetry as u cant divide the shape into equal halfs.

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