Word:

tracker ball

(hardware)tracker 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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track and field
track ball
track down
track event
track meet
track record
Track scale
track star
Track-road
track-to-track seek time
trackable
Trackage
trackball
tracked
tracked vehicle
Tracker
-- tracker ball --
tracking
Tracklayer
Trackless
trackless trolley
Trackman
Trackmaster
trackpad
TrackPoint
Trackscout
Trackwalker
Trackway
Tract
tract house
tract housing
Tractability
Tractable
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