Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. information artifacts
7. [information artifacts by function]

Anotations

Scope note:

Strings or other physical combinations of specific objects such as kola nuts, cowrie shells, pieces of textile, chalk, or bark, conveying highly allusive encoded messages. These are used by the Yoruba of West Africa in a symbol communication system.