The US term is a trapezoid (called a trapezium in some countries).
The basic form is like the cross section of a metal ingot - top and bottom are parallel, top is shorter, both sides are sloped. There are, of course, versions where the slopes of the sides are not the same, and their lengths different.
Typical trapezoid:
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a hexagon
It is a quadrilateral with exactly 2 pairs of parallel sides.
A trapezoid is a quadrilateral with at least one pair of parallel sides. This pair of parallel sides are known as the bases of the trapezoid. The other two sides are called the legs, and they are not parallel to each other. So, a trapezoid has exactly one pair of parallel sides.
A trapezoid has only 1 pair of parallel sides of different lengths
A trapezoid (trapezium) has only 2 sides parallel and not all angles equal