Terran Sign Language

The history of Terran Sign Language is very similar to the development of Terran Standard. The difference being Terran Sign Language is a method to communicate without sound, and thus only works in a visual medium. Its roots come from languages designed for the hearing impaired. One of the larger issues Terran Sign Language (or TSL) has is it largely only works for humanoids or very similar looking species.

The language also sees some use in military and mercenary circles as a way to convey more complex information than standard hand signals can allow. Development of the language has slowed with some humans showing natural psionic ability, as well as development into cybernetics to allow those unable to speak naturally to do so.