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In graphical user interfaces, the control element adjustment handle is a small box that appears on the corners and edges of a selected element such as another graphical control element like a window. This allows the user to alter size or shape. [1]
By dragging and dropping the control handle onto an edge, the user can make the control wider or narrower, taller or shorter. Corner handles let one move two edges at once. [2]
An adjustment handle can also be used in audio editing software. [3]