Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Attributes and Properties (hierarchy name)
4. [attributes and properties by specific type]
5. form attributes
6. shape (form attribute)
7. geometric shape
8. polygonal
9. quadrilateral (shape)

Anotations

Scope note:

In North America, the form or shape of quadrilateral figures having one pair of parallel and one pair of nonparallel sides. In Britain and certain other places, these figures are called a "trapeziums." "Trapezium" has a different meaning in North America, referring to figures having no parallel sides.