Wave A never goes beyond the origin or point X.
Structure = 3-3-3-3-3
At least four of the five waves subdivide into a or a combination of zigzags.
Triangles do not have more than one complex subwave (only one Double or Triple).
One of the five waves can subdivide into an Impulse
In a Barrier Triangle, Wave C never goes beyond Wave A, & Wave E never moves beyond C.
In a Barrier Triangle, Wave D ends around Wave B, forming a straight flat line or Barrier.
Wave B may go beyond the start of Wave A; it is not common and it is called a Running Triangle.
A Wave 5 following a Barrier Triangle can either be sharp, short and brief; or turn into an Extended Wave 5.
Barrier Triangles are less common than a Contracting Triangle.