A gesture that is a form of communication in which bodily actions communicate particular messages. Manual gestures are most commonly broken down into four distinct categories: Symbolic (Emblematic), Deictic (Indexical), Motor (Beat), and Lexical (Iconic) It is important to note that manual gesture in the sense of communicative co-speech gesture does not include the gesture-signs of Sign Languages, even though sign language is communicative and primarily produced using the hands, because the gestures in Sign Language are not used to intensify or modify the speech produced by the vocal tract, rather they communicate fully productive language through a method alternative to the vocal tract.