Tusken Sign Language served as the communication method for the Tusken Raiders inhabiting Tatooine. This sign language differed from the spoken dialect of the Tusken people.
Troy Kotsur was responsible for the creation of this language. An article titled "Troy Kotsur: Tusken Translator" featured in Star Wars Insider 215 referred to it as "galactic sign language." This article considers that designation likely an error, as "Tusken Sign Language" suggests it's specific to the Tusken Raiders.