The Square Knot, also known as the Double Knot or Reef Knot is a simple, handy knot for temporary ties. It is most often used to joint two similar sized ropes / lines together so they will not slip. It tightens under strain but can be untied by grasping the ends of the two bights and pulling the knot apart. This knot is also used for tying bandages, as it lies flat. The Square Knot has limitations. It is not suitable for any application where it will take high strain.
To Tie a Square Knot:
| Start with the two ends opposite each other |  |
| Cross the left end over the right |  |
| Flip the left end under the right one to make a single knot |  |
| Next, take the left end again and cross it over the right end |  |
| Make a simple knot in the opposite direction to step 2 and 3 |  |
| Pull the ends to secure the knot |  |
| You can adjust to make it tight or loose. To undo, just pull at the knot, with one hand on each side of the knot |  |