Modern
stunt kites apparently come in three
basic flavors:
eye candy,
delta wing stunt kites and
quadrafoil stunt kites. Most, if not all have
two lines, but some do have
one or more than
two.
The eye candy kite is any that fits the definition but isn't truly for the sport of kite flying (what you buy at the beach that has two lines).
Delta wing kites have your basic delta shape to them (triangle-ish), with vertical and horizontal support bars. Rarely do they have tails.
Quadrafoil kites have the rectagonal shape normally associated with parachutes. Quadrafoils are common stacked on top of each other providing enough lift at four to lift a full grown man into the air.
Higher end kite flying involves wind powered sand buggies, aquatic boards, and lots of acrobatic manuevers.
gleamed while buying a kite at the beach recently