NURBSTo Row (Geometry Section)
Contains the x and ycoordinates, position of the second to last knot, position of the last weight, position of the first knot, position of the first weight, and the formula for a nonuniform rational Bspline (NURBS).
A NURBSTo row contains the following cells.
Cell  Description 

The xcoordinate of the last control point of a NURBS. 

The ycoordinate of the last control point of a NURBS. 

The second to the last knot of the NURBS. 

The last weight of the NURBS. 

The first knot of the NURBS. 

The first weight of the NURBS. 

A NURBS formula. 
Remarks
NURBS is a common way to represent a curve mathematically. You can create a NURBS with the Freeform tool.