Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. [structural elements and components for structural elements]
8. structural elements
9. [supporting and resisting elements]
10. [columns and column components]
11. columns (architectural elements)
12. [columns by location or context]

Anotations

Scope note:

Three or more closely spaced columns which form a distinct group. When two columns form a distinct group, use "coupled columns" or "doubled columns." For supports consisting of several columns engaged around a central core, especially in Medieval contexts, use "compound piers."