A leader object is a line or a spline with an arrowhead at one end and a multiline text object or block at the other. In some cases, a short horizontal line, called a landing, connects text or blocks and feature control frames to the leader line.
The landing and leader line are associated with the multiline text object or block, so when the landing is relocated, the content and leader line move along with it.
When associative dimensioning is turned on and object snaps are used to locate the leader arrowhead, the leader is associated with the object to which the arrowhead is attached. If the object is relocated, the arrowhead is relocated, and the landing stretches accordingly.