Noun
trackball
trackball (plural trackballs)
(computing) A pointing device consisting of a ball housed in a socket
A trackball requires no mousepad and enables the player to aim swiftly (in first person shooters). Source: Internet
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 mouse with an exposed protruding ball. Source: Internet
However, many gamers are deterred by the time it takes to 'get used to' the different style of hand control that a trackball requires. Source: Internet
Elderly people sometimes have difficulty holding a mouse still while double-clicking ; the trackball allows them to let go of the ball while using the button. Source: Internet
An Apple Pippin Gamepad with a trackball. Source: Internet
A keyboard with trackball is the input device for operation of this system. Source: Internet