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None.
Assuming the question is about ROTATIONAL symmetry rather than rational symmetry, the answer is none.
Kite
A squashed open box? Alternatively, a right-angle trapezium: ............................ .-------------....... .|..................\...... .|...................\..... .|....................\.... .|......................\.. .-----------------. ............................
It is 360 degrees divided by the order of rotational symmetry.