Transform Panel

• Control Point, Vertex
• The first controls (X, Y, Z) show the coordinates of the selected point or handle (vertex).In case of a NURBS curve, there is a fourth component available (W),which defines the of the selected control point or the median weight.
• The Space radio buttons let you choose if those coordinates are relativeto the object origin (local) or the global origin (global).

• Weight
• Radius
• Controls the width of the extrusion/bevel along the "spinal" curve.The radius will be interpolated from point to point (you can check it with the normals).
• Controls how the normals (visualized as arrows)twist around each control point — so it is only relevant with 3D curves!The tilt will be interpolated from point to point (you can check it with the normals).