Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Recreational Artifacts (hierarchy name)
5. recreational artifacts (equipment)
6. toys (recreational artifacts)
7. [toys by form]
8. whirligigs

Anotations

Scope note:

Spool-like toys consisting of two small thick disks connected at their centers by a short dowel around which a string is attached by which the yo-yos can be whirled; of ancient Far Eastern origin, popular in the West only from the 20th century on.