Other forms: sign languages
Sign language is a language that uses hand gestures, body movements, and facial expressions to convey meaning, rather than spoken words.
In the U.S., the main sign language is known as American Sign Language. Groups of hearing impaired people have developed sign languages throughout history, some of which consisted only of signed letters. Major sign languages today require fingerspelling of some less-common words and names, both most words are represented by distinct signs. There are as many as 500,000 sign language speakers in the U.S. alone.