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]
8. [declaratory and advertising artifacts]
9. signs (declatory or advertising artifacts)
10. [signs by form]

Anotations

Scope note:

Use specifically for those signs consisting of symbols designed on the basis of the U.S. Department of Transportation system of regulatory, warning, and informational signs, for example a symbol of prohibited activity inside a red ring crossed by a red slash.