In general, none.
There are 0 lines of symmetry in a parallelogram.
none
Most shapes do not have lines of symmetry so why should it come as a surprise that a parallelogram has none?
Parrallelogram (it has rotational symmetry but no lines of symmetry)
A parallelogram has rotational symmetry of order 2.
parrallelogram
A nephroid has 2 lines of symmetry.
it has five lines of symmetry
10 lines of symmetry
4 Lines of symmetry
2 lines OF SYMMETRY
2 lines of symmetry