Hierarchy classification:

1. top of the aat hierarchies
2. Associated Concepts Facet
3. Associated Concepts (hierarchy name)
4. language-related concepts
5. [languages and writing systems]
6. [languages and writing systems by general type]
7. languages (established systems of communication)

Anotations

Scope note:

Means of communication using facial expressions and bodily movements, especially of the hands and arms, as opposed to acoustically conveyed sound patterns. Used when spoken communication is impossible or not desirable, for example between speakers of mutually unintelligible languages or when one or more parties is deaf.