It's another way to call sign language, hand language, or Dactilología. Although the concept of sign can be a little wider depending on the context, and the consultation can refer not only to the communication system by means of gestures used mainly by those who do not have the capacity to hear and/or vocalize, but also to the ideographic, Pictography, Logografía or even Braille or tiflografía. See sign-talking, sign system.
