The Marline Spike.
A useful knot which can be tied at any point along a length of rope without needing to thread a rope end. Often used by a groundsman to anchor a rope pulling aid or to create a loop on a climbers rope for the attachment of tools such as a chainsaw which the climber can then pull up into the tree.
Stage 1. Form a simple circle.
Stage 2. Position the lower end of the rope behind the coil.
Stage 3. And then pull this through the coil to produce the loop.
This knot is also useful for fixing a pulling aid on to a rope, such as a plank of wood. The plank would be inserted into the loop at this stage prior to tightening.
Stage 4. And tighten.
Please note, the guidance contained within this web page has obvious limitations. It is recommended that you obtain proper instruction from a relevant training provider before using any knots for serious applications such as tree climbing etc.