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. measuring device components
7. timepiece components
8. [clock and watch components]

Anotations

Scope note:

Refers to the inclined plates or pins on sundials whose shadow indicates the time. These may be pillars, rods, or other objects which serve to indicate the time of day by casting a shadow upon a marked surface, including the pin or triangular plate used for this purpose in an ordinary sun-dial.