Trackball meaning

trăkbôl
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A ball mounted in a stationary housing and rotated to control a pointer on a computer screen.
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A device, typically built into a computer console or mouse, containing a recessed ball that can be freely rotated by hand in any direction so as to move or position the cursor.
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A stationary pointing device that contains a movable ball rotated with the fingers or palm. From one to four keys are located in various positions depending on the unit. In the late 1980s and 1990s, Kensington Microware popularized the trackball with its Turbo Mouse for the Macintosh. Turbo Mouse for Windows was subsequently released, and over the years, the Turbo Mouse evolved into the Expert Mouse and Orbit brands.The advantage of the trackball, and the reason many people like it, is that the unit remains in the same position on the desk, and only the ball is moved. See mouse, pointing stick and touchpad.
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(computing) A pointing device consisting of a ball housed in a socket.
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Origin of trackball