Triangles & Wedges: How Traders Read These Chart Patterns

A triangle and a wedge are both built from the same raw material: two trendlines that converge as price moves to the right. One line connects a series of swing highs, the other connects a series of swing lows. As those lines close in on each other, the visible trading range narrows — price is making smaller and smaller swings.

That narrowing is the whole story the shape tells you. It is a picture of consolidation: buyers and sellers trading in an increasingly tight band. It is descriptive, not predictive. The pattern does not contain information about where price will go; it only summarises where price has been.

To draw either pattern with any rigour, traders generally want at least two touches on each trendline — two highs the upper line connects, two lows the lower line connects. With a single touch you are not drawing a pattern, you are guessing at one. Even with multiple touches, line-drawing is subjective: two careful traders can place the same trendline slightly differently, and that is a normal limitation to keep in mind rather than a flaw to argue away.

Triangles are usually grouped by the slope of their two lines.

A symmetrical triangle has a downward-sloping upper line and an upward-sloping lower line. Highs are getting lower and lows are getting higher at roughly the same rate, so the range pinches toward a point. Traders typically read this as neither side having clear control — the market is simply coiling.

An ascending triangle has a roughly flat upper line and a rising lower line. Price keeps stalling near the same overhead level while the lows climb. Traders often describe this as buyers repeatedly testing one ceiling, though that description says nothing certain about whether the ceiling will hold or give way.

A descending triangle is the mirror: a roughly flat lower line and a falling upper line, where price keeps testing the same floor while the highs step down.

A word of caution that applies to all three: the labels (ascending, descending) are geometric descriptions of the lines, not forecasts. It is easy to let the name imply a direction. Resist that — the shape describes past swings, and past swings do not bind future ones.

A wedge also uses two converging lines, but both lines slope in the same direction.

In a rising wedge, both the upper and lower lines tilt upward, with the lower line rising more steeply so the two converge. In a falling wedge, both lines tilt downward, with the upper line falling more steeply. Compare that to a symmetrical triangle, where the two lines slope toward each other from opposite directions.

That shared slope is the only structural thing separating a wedge from a triangle. Traders sometimes treat wedges and triangles as carrying different tendencies, and you will see plenty of confident claims about what each one 'means'. Treat those claims as folklore worth knowing rather than rules worth trusting. The honest version is narrower: a wedge is a narrowing range that also drifts in one direction. What happens after it is not encoded in the shape.

Once a pattern is drawn, a few features tend to draw attention. None of these are instructions to buy or sell; they are simply the parts of the chart traders look at.

The trendlines themselves are the obvious reference. Many traders watch for price to move outside one of the converging lines, often called a breakout. The important and frequently ignored point: a move outside a line can fail. False breaks — where price pushes past a line and then moves back inside the range — are common, and a breakout is not a guarantee of follow-through.

The pattern's height (the vertical distance at its widest point) is another thing people measure, sometimes to gauge how far a move might extend. This is an estimate based on past range, not a target the market is obliged to reach.

Volume is a third. Some traders note whether activity expands or contracts around the lines. It is context, not confirmation.

The healthy way to hold all of this: these are observations a trader makes while studying a chart, each one uncertain, each one capable of being wrong. Nothing here is a signal to act on, and none of it removes the risk of loss.

If you want to experiment with these shapes on your own charts, the cleanest starting point is to detect swing highs and lows and let your eye connect them — pattern recognition itself is subjective enough that hard-coding it tends to produce more false labels than insight.

This Pine v6 snippet just marks recent pivot highs and lows so you have honest reference points to draw your own converging lines from. It does not detect a triangle, and it does not generate signals.

//@version=6
indicator("Pivot Markers (study aid)", overlay = true)

len = input.int(5, "Pivot lookback/forward", minval = 1)

ph = ta.pivothigh(high, len, len)
pl = ta.pivotlow(low, len, len)

plotshape(not na(ph), title = "Pivot High", style = shape.triangledown,
     location = location.abovebar, color = color.red, size = size.tiny)
plotshape(not na(pl), title = "Pivot Low", style = shape.triangleup,
     location = location.belowbar, color = color.teal, size = size.tiny)

Note that ta.pivothigh/ta.pivotlow confirm a pivot only after len bars have passed, so markers appear with a lag — that is the function working as intended, not a bug. Use the markers as anchor points for your own trendlines, and remember the lines you draw are an interpretation, not a measurement.

Nothing in this article or snippet is trading advice or a prediction. Chart patterns describe past price; they do not forecast future price, and all trading carries a risk of loss.