These are also known as asymmetric shapes.
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Nothing has 1 order of rotational symmetry because in rotational symmetry 1 is none.
Yes but it's not normally included
It has 1 order of rotational symmetry.
Not necessarily, except rotational symmetry of order 1.
If the leaf stem is present, it has symmetry of order 1. Otherwise, it can have rotational symmetry of order 3.