NAME: Reef Knot, also known as the Square Knot
USES: SAILING, MACRAME
WHEN: To bind ropes of the same size. “A reef knot is safe when under constant tension but may tend to slip on synthetic rope.” It slips, it comes undone, it jams. Never to be used when safety is critical.
Used to tie a sail cover over a sail.
MANTRA: Left Over Right, then Right Over Left