Dictionary of Computer and Internet Terms: callout
callout
the line and caption marking the specific parts of a labeled illustration. For examples,see Figure 298 at window.
Dictionary of Marketing Terms: callout
callout
phrases or sentences used to identify or call attention to elements in a layout, photo, or drawing. Placed outside the margin of the layout, photo, or drawing and connected by a straight line to the feature it describes, a callout is used to emphasize or explain the various elements depicted. Callouts can be used in the finished advertisement to note features of special interest, or they can work as aids to printing personnel to call attention to particular printing directions.