Page 62 - Peter Randall "The Craft of the Knot.."

To tighten the loop, pull on all the leads. As you can see, the Butterfly
Loop ties very quickly with just a little practice.

DIRECTIONAL FIGURE EIGHT

The Directional Figure Eight is an excellent loop that can be tied in the
end of a rope to be used as a fixed loop, or anywhere in the middle
where the pull will be along the direction of the rope.

STEP 1 Start by making a bight, then fold it back along one side.

STEP 2 Pass the bight behind the standing part and back under the

first crossing turn, exactly in the manner of making a Figure Eight.

STEP 3 As you tighten the knot, the final loop will lay in the direction
that strain will be placed on it.