trackball
A stationary pointing device that contains a movable ball rotated with the fingers or palm. From one to three keys are located in various positions depending on the unit. Years ago, Kensington Microware popularized the trackball with its Turbo Mouse for the Macintosh. See mouse, pointing stick and touchpad.
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| The Turbo Mouse |
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| The Turbo Mouse popularized the trackball for the Macintosh. Later models were developed for the PC. (Image courtesy of Kensington Microware, Ltd.) |
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