The figure you are describing is best called a trapezium (or a trapezoid in some regions, like the United States). In geometry, a trapezium is defined as a four-sided polygon, or quadrilateral, that does not have any sides that are parallel. Unlike its counterpart, the trapezoid, which does have at least one pair of parallel sides, the trapezium stands out for its irregular shape. While there are various types of quadrilaterals—such as rectangles, squares, and parallelograms—that have parallel sides, the trapezium is unique because it lacks symmetry and defined angles that parallelism often creates. Hence, if you’re looking for a name that captures a quadrilateral with no parallel sides, trapezium is the most accurate term.
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