what is the figure 9 knot used for
Figure-9. The figure-9 knot is similar to the figure-8 on a bight. It is used for the same things as the figure-8, but is claimed to be stronger and less likely to jam. The strength factor may be significant in rigging using rope of 9mm or less.(See [ SP96, p 46].).igure-8. The figure-8 knot can be used as a stopper knot (e.g. to prevent a rope from passing through a pulley). Its more common uses are in the forms tied in the bight or re-traced. No securing knot is required, but many people prefer to add an overhand backup.