Artillery Loop or Manharness Loop
The main attractiveness of this loop tied in the bight is the speed with which it can be tied.  The Artillery Loop must have the loop loaded or it will slip and contract easily.  Even when the loop is transmitting the load, it can contract when pulled hard and therefore should only be used for light to moderate non-criticial work.

Related pages:  Butterfly Loop, Span Loop, Farmer's Loop, Pile Hitch