Page 287 - Buck Tilton - Outward Bound Ropes, Knots, and Hitches 2 ed.

Back Splice: Step 2

Tighten the crown knot against the end of the

rope. Splicing can start now.

Since back splicing serves the same purpose as whipping
(tying smaller stuff around a cut end of rope to prevent

fraying), this knot is sometimes known as Spanish whipping.
Unlike whipping, a back splice actually becomes stronger

with use. A similar interweaving of strands can be used to
splice two ropes into one.