Yerkish

Yerkish is an artificial language developed for use by non-humanprimates. It employs a keyboard whose keys contain lexigrams, symbols corresponding to objects or ideas.

Lexigrams were notably used by the Georgia State University Language Research Center to communicate with bonobos and chimpanzees. Researchers and primates were able to communicate using lexigram boards made in up to three panels with a total of 384 keys.