Any irregular polygon with 4 or more sides can have only one pair of parallel sides. Only the trapezium (a quadrilateral) has a specific name. Or theres more than the trapezium because i have home work and theres more than three!
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To indicate that a pair of lines are parallel you mark them both with an arrow. If there is another pair of parallel lines on the same shape you mark those with a double arrow.
A regular pentagon has no parallel lines, but you can create an irregular pentagon with one pair of parallel lines if you make a traditional 'house' shape with parallel 'walls'.
Only one pair: trapezium.
A trapezoid has 4 sides, 2 acute and 2 obtuse angles, and only one pair of parallel sides
Parallelograms have two sets of parallel lines. Trapezoids only have one pair of parallel lines.