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

  tracker ball
  track ball
      A pointing device consisting of a ball housed in
     a socket containing sensors to detect rotation of the ball
     about two axes - like an upside-down mouse.  The user rolls
     the ball with his thumb or the palm of his hand to move a
     cursor.  Tracker balls are common on CAD workstations for
     ease of use and on modern portable computers, where there
     may be no desk space on which to use a mouse.  Some clip
     onto the side of the keyboard and have integral buttons which
     have the same function as mouse buttons.

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