The only polygon that absolutely positively never has any parallel sides is a
triangle. Any other shape comprised of four or more straight line segments
could have one or more pairs that are parallel.
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There are no parallel sides on a nonagon (nine-sided figure)... Regular shapes with an odd-number of sides have no parallel sides.
Parallel sides, non-adjacent sides, skew sides in 3-d shapes.
Put 2 lines on the perpendicular sides and put 1 line for the parallel sides
A shape that doesn't have pairs of parallel sides is a circle. This is also true of ellipses and triangles.
There is no generic name. Any polygon with 4 or more sides can have 2 parallel sides. There are also non-polygonal shapes that can have parallel sides: for example, a circle that is stretched out into a cigar shape can have two parallel sides.