Segments

Subdivide

Reference

Mode:Edit Mode
Menu:Curve ‣ Segments ‣ Subdivide

Curve subdivision simply subdivides all selected segments by adding one or more control points between the selected segments.

Number of Cuts
The number of subdivisions to perform.

Switch Direction

Reference

Mode:Edit Mode
Menu:Curve ‣ Segments ‣ Switch Direction

This tool will "reverse" the direction of any curve with at least one selected element (i.e. the start point will become the end one, and vice versa). This is mainly useful when using a curve as path, or using the bevel and taper options.