Term of the Moment
jitter
Definition: mouse buttons
There are generally two buttons on every mouse. The left button is the primary button, which selects the object at the screen cursor (click the mouse) or is held down (drag and drop). The right button (right click) is typically used to display an auxiliary menu (see context menu). Most mice today have scroll wheels, which reside between the two buttons. See scroll mouse.
A Bunch of Mice
The arrows point to the scroll wheel, which resides in the middle of the left (L) and right mouse buttons. As is evident in this example, the buttons are part of the casing and do not stand out.