The 3-3-3-3-3 internal structure of a symmetrical triangle based on Elliott's definition

Triangle (EWP)

Under orthodox Elliott Theory, a triangle is a sideways congestion pattern that consolidates the previous wave. The structure is 3-3-3-3-3, and it’s labeled A-B-C-D-E.

There are four varieties of triangles: Contracting, Ascending and Descending (all are contained by converging trendlines) and Expanding which is the  rarest variety. In an Expanding triangle, the endpoints of each wave occur at wider levels, which leaves trendlines that get wider towards the end of the pattern.