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. [spanning and projecting structural elements]
10. [trusses and truss components]
11. trusses (structural elements)
12. [trusses by form]

Anotations

Scope note:

Trusses whose upper and lower chords are both curved in the same direction but with different radii of curvature, so that they meet at the ends, giving a crescentlike appearance. Trusses whose upper and lower chords are both curved in the same direction but with different radii of curvature, so that they meet at the ends, giving a crescentlike appearance.