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rotation symmetry of a parallelogram Sequence
Sometimes called rotation symmetry, or symmetry of rotation. If you have an object that can be turned through a certain angle (like rotating a cube through 90o) and then it looks identical, then that object has a certain symmetry under rotation. If you can turn it through any angle, like a cylinder, then it has rotation (or rotational) symmetry.
A regular Undegon (11 sided polygon) has 11 lines of symmetry. It also has an order of rotation symmetry of 11.
A Parallelogram, a Diamond and a rhombus all have rotational symetry of two. Others Kite 1 Trapezium 1 Square 4
Oh, dude, a regular hexagon has six sides, so it has six lines of symmetry. Each line of symmetry represents a different way you can rotate the hexagon and have it look the same. So, the order of rotational symmetry for a regular hexagon is 6. Like, it's symmetry, but make it hexagonal.