tact switch
Tactile switches differ from other switches in that the user feels the triggered switching operation. Hence the name derived from Tactile, which refers to the sense of touch.
Tactile switches provide tactile feedback to the operator that the switch has been actuated. This lets the operator know that the switch has been actuated. Tactile switches are usually pushbutton switches or pushbuttons that have one or two pressure positions and are triggered with different pressures. The user senses the actuation and triggering of the switch by the pressure point that he or she must overcome. Some of these tactile switches also produce a switching noise when triggered.