Half hitch

This is the most basic element of a knot or a more complicated hitches. It's just a twisted loop!

It can be tied in a series and this makes it significantly stronger. The old Lineman's saying is "One will hold a man, two will lift a horse, and three will pull the world." If you are just using Half Hitches to lift or pull something, secure the tag end with tape. Even if you don't use it as the actually pulling knot for wire pulls, I still usually finish a Schwäbisch Hitch with a Half Hitch close to the end of the wire head. It helps guide the wire through the pipe and around bends.

It's also a great way to finish a knot like a Trucker's Hitch. If you tie it with a bight of rope, it's called a Slipped Half Hitch and can easily release by pulling the tag end.