In this guide
Convergence is the defining featureDirection is not encoded in the nameMeasurements people useAvoid hindsight-perfect linesConvergence is the defining feature
The structure becomes narrower as the two trend lines approach each other. A triangle can be visually neat or messy; there is no universal requirement for an exact number of touches or a fixed slope.
Direction is not encoded in the name
Unlike labels that sound directional, “symmetrical” highlights converging boundaries. The chart can leave the structure through either side, so the geometry alone does not establish direction.
Measurements people use
Pattern height, remaining width and distance to either boundary can all be expressed mathematically. A measured-move projection can also be calculated after a chosen breakout reference is supplied, but the projection remains a formula result rather than a forecast.
Avoid hindsight-perfect lines
It is easy to redraw boundaries after the outcome is known. For learning, define anchor rules before inspecting what happens next. That makes the exercise more reproducible and exposes how much subjectivity the pattern contains.