Autodesk AUTOCAD 2006 Command Reference Manual page 966

Annotation Reuse
Sets options for reusing leader annotation.
None
Does not reuse leader annotation.
Reuse Next
Reuses the next annotation you create for all subsequent leaders.
Reuse Current
Reuses current annotation. This option is automatically selected when you
reuse annotation after selecting Reuse Next.
Leader Line & Arrow Tab (Leader Settings Dialog Box)
Sets the leader line and arrowhead format.
Leader Line
Sets the leader line format.
Straight
Creates straight-line segments between the points you specify.
Spline
Creates a spline object using the leader points you specify as control points.
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