Two converging trendlines, volume quietly shrinking, a range compressing toward a single point — three shapes, one shared mechanism, and a breakout direction most traders guess before it's earned.
Western bar-chart geometry — simple straight lines connecting highs and lows — gave chartists triangles decades before candlesticks crossed the Pacific.
The landmark text classified triangles by which line is flat and which is sloped — ascending, descending, and symmetrical, each with its own default expectation.
Because a triangle is visually obvious well before it finishes, traders routinely guess the breakout direction early and get it wrong — especially with the symmetrical version.
Traders today watch volume contract through the triangle and expand on the breakout as the real confirmation, not the shape's slope alone.
Ascending: a flat ceiling, rising lows. Descending: a flat floor, falling highs. Symmetrical: both lines converge toward each other — the coil, with no obvious lean.
Ascending triangles break upward more often than not — rising lows show buyers growing more eager. Descending triangles lean down. Symmetrical triangles have no reliable default — they usually just continue whatever trend led into them.
Volume typically contracts as the range narrows, then expands sharply on the breakout — real confirmation. Measure the triangle's tallest point (the "back") and project that height from the breakout for a rough target.
Ahead of the late-2020 breakout, price formed progressively higher lows against the old cycle high, before clearing it decisively on rising volume.
A symmetrical consolidation mid-2022 offered no obvious lean either way until price broke downward, continuing the broader bear market already in place — the honest default for this shape.
Price makes progressively higher lows against a flat ceiling, with volume shrinking throughout. What kind of triangle is this, and what's the default lean?
A symmetrical triangle breaks upward, but volume on the breakout candle is noticeably lower than the average volume inside the triangle. What's the read?
An ascending triangle breaks upward on strong volume, then two sessions later, price dips back to briefly touch the old ceiling before continuing higher. Has the pattern failed?
A range compressing, watched swing by swing on the left — and the mark it leaves in the ledger on the right. Ascending resolving up, descending resolving down — and a break that never had the volume behind it.
A converging range and a breakout. Judge the shape's lean and the volume behind the break — then call it: trade the direction, pass, or flag it as weak-volume.
The classic error is entering early based on the shape's default lean, before any real break. The discipline is mechanical: wait for a confirmed close beyond the line, backed by real volume, and accept that symmetrical triangles especially have no reliable early tell.
Three converging shapes, one shared mechanism: a range narrowing on shrinking volume, waiting for a real, loud release. The lean is a hint. The break, backed by volume, is the answer.
Still waters run deep.