Trucker's hitch

Canonical Name: trucker's hitch.
Variant Name(s): None.
Category: binding.
Origin: Ancient.
Related knots:
Releasing: Non-jamming.
Efficiency: Unknown.
Caveat: None.
Uses: Securing objects.
Comments: It may be tied in the middle of a line (without needing either bitter end - very useful when working with long lines). It also leaves the line relatively untangled when removed.
Structure:
Tying:

The first section of the hitch is a double-twisted version of a slipknot loop. With the right hand, grab the rope and make a (fold) loop about one foot long, holding the base of the loop with the left hand. Twist the left hand twice (once would be a standard slipknot) and insert the right-hand end of the loop through the twist. (The base of the loop should look like a double figure eight knot.)

The second section of the hitch tightens and secures the load to a securing point (or an existing section of rope).

Fold the rope again to the right of the first knot, and loop this double-strand around the securing point. Bring the double-strand back and through the first knot's loop, tighten (you can hold the hitch tight with the left thumb and forefinger) and tie a doubled two half hitches around the tight double-strand to secure the line. You may then continue to use the right-hand side of the rope for more securing.

The hitch may be released (or retightened) by loosening the doubled two half hitches.