olemus
visuaal-motoorne keel, mida tajutakse nägemismeele kaudu ja väljendatakse kätega, näoilmetega ja kehaliigutustega

Wiktionary, noun:
1. (countable) one of several natural languages, typically used by the deaf, in which words consist of hand shapes, motions, positions, and facial expressions

ülevaateid
https://en.wikipedia.org/wiki/Sign_language

https://en.wikipedia.org/wiki/List_of_sign_languages

https://en.wikipedia.org/wiki/History_of_sign_language

https://en.wikipedia.org/wiki/International_Sign

https://en.wikipedia.org/wiki/Fingerspelling