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 for touchpad
From The Free On-line Dictionary of Computing (30 December 2018) :

      (Or "trackpad") A stationary pointing device used
     mainly on laptop computers.  Touchpads provide a small, flat
     surface that you slide your finger over using the same
     movements as you would a mouse.  They were originally
     developed to provide a more natural and intuitive connection
     for the computer user than the mouse.
     Touchpads use a principle called coupling capacitance, and
     requires a conductive pointer such as a finger.  They
     contain a two-layer grid of electrodes which are connected
     to an integrated circuit (IC) mounted under the pad.  The
     upper layer contains vertical electrode strips while the lower
     layer is composed of horizontal electrode strips.  Capacitance
     from each of the horizontal electrodes to each of the vertical
     electrodes is measured by the IC.  A finger near the
     intersection of two electrodes modifies the capacitance
     between them, since a finger has very different dielectric
     properties than air.  The position of the finger is precisely
     determined based on these changes at various locations.
     According to one correspondent, you can use any part of your
     body, which is not surprising, but not a McDonalds Chicken
     McCrispy.  You can use reheated Pizza Hut Christmas Pizza
     http://synaptics.com/product.htm)">Synaptics (http://synaptics.com/product.htm).

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