Topic summary
Sign Languages
Extracted from the Wikipedia article Sign language.
Sign languages (also known as signed languages) are languages that use the visual-manual modality to convey meaning rather than spoken words. They are expressed through manual articulation in combination with non-manual markers, and are full-fledged natural languages with their own grammar and lexicon. Sign languages are not universal and are usually not mutually intelligible, although there are similarities among different sign languages.