Logitech Cordless Trackman Optical Trackball mouseAn input device that looks like an upside-down mouse. The onscreen pointer is moved by the trackball with a thumb or finger. A trackball requires less arm and wrist motion that a regular mouse takes and therefore is often less stressful for the user to use, helping to prevent RSI. The picture of the Logitech Cordless Trackball mouse is an example of what a trackball mouse may look like.

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Also see: Mouse, Mouse terms, Pointing device