A quadrilateral is called a trapezoid in United States usage and a trapezium in United Kingdom usage. Under either name, which feature does this shape have that a quadrilateral with no parallel sides lacks?

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The feature both national names agree on is a pair of sides running in the same direction and never meeting, which is exactly what a quadrilateral with no parallel sides is missing. Four sides of one length is a rhombus condition and says nothing about direction, since a shape may hold parallel sides of very different lengths.