Knot removal is the reverse of knot insertion. There are four main knots used to knot neckties. There are a number of ways to tie the Overhand knot. This is a very common mistake made by people learning to tie a reef knot. The wrist strap is tied with a Cow hitch knot. This fact is also related to the braid groups well known in knot theory. She wears a pink wobbly hairband with a butterfly knot. Magnum revolver with its muzzle tied in a knot. Every ribbon knot is smoothly slice. The easiest trick knot is the slip knot. A heavily tightened constrictor knot will likely jam. In later times a "sword knot" or "tassel" was sometimes added. Type G resembles a butterfly, and lacks the center "knot". It is a device rigging rather than a true knot. These aforementioned invariants are only the tip of the iceberg of modern knot theory.