In the new era of computer science & language technology, Signal acknowledgement is a varied topic with the aim of taking human motions through mathematical algorithms. Signals can create from any physical motion or state then commonly initiate from the face or hand. Present emphases in the field comprise emotion acknowledgment from the face and hand motion response. Various methods have been completed using cameras and computer vision algorithms to understand sign language. Nevertheless, the sympathy and gratitude of pose, gait, proxemics, and humanoid performances is also the matter of signal acknowledgment methods. Signal acknowledgment can be understood as a way for computers to create to realize human body language, so constructing a comfortable bridge among machines and humans than original text operator interfaces before even GUIs (graphical user interfaces),that is still in the limit the popular of input to keyboard and mouse.