American Sign Language
From Memory Alpha, the free Star Trek reference
American Sign Language was a type of sign language used in North America.
The educational background of Kathryn Janeway includes study in American Sign Language, chromolinguistics, and the gestural idioms of the Leyron. Despite this experience, she could not get the hang of the Tak Tak's form of communication in 2373. (VOY: "Macrocosm")
