A trapezoid.
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Trapezoids have only one pair of parallel sides.
A trapezoid is a four-sided figure (or "quadrilateral") with only one pair of parallel sides.
Every quadrilateral that is a standard square, rectangle, or parallelogram has at least ONE pair of parallel sides - and they all have two pairs of parallel sides. For only ONE pair of parallel sides, you need an irregular trapezoid.
A trapezoid ..
Trapezoid