M-9
M-9 was the designation of a sign language using two hands.

In 2365, this language had been recorded in the linguistic database of the . It was identified and learned by Lieutenant Commander Data in his attempt to communicate with Riva, a deaf mediator from Ramatis III. M-9 was one of five languages he chose to learn to identify the particular language Riva was using. As such, Data viewed multiple M-9 gestures on a screen.

One of the gestures of the M-9 sign language was similar to the Vulcan salute. ()

Languages