A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down ball mouse with an exposed protruding ball
Logitech Cordless TrackMan Wheel trackball mouse
The original version of the Kensington Expert Mouse can use a US-size billiard ball as a trackball.[citation needed]
An Apple Pippin gamepad with a trackball
Logitech TrackMan Marble Wheel designed to use the ball with the thumb
A pointing stick is a small analog stick used as a pointing device typically mounted centrally in a computer keyboard. Like other pointing devices such as mice, touchpads or trackballs, operating syst
Trackball
…settings for the same reason. Trackballs were often included in laptop computers, but since the late 1990s these have been replaced by touchpads and pointing sticks. Trackballs are still used as separate input devices with standard desktop computers, but this application is also moving to touchpads due to the…
Pointing stick on a Lenovo ThinkPad
Detail: rear side of a Lenovo ThinkPad pointing stick with the strain gauges. Size: 8 x 8 mm. Out of patent
IBM ThinkPad caps (left-to-right): Soft Dome, Soft Rim, Classic Dome, Eraser Head (discontinued)
A pointing stick on a mid-1990s-era Toshiba laptop. The two buttons below the keyboard act as a computer mouse: the top button is used for left-clicking while the bottom button is used for right-clicking.