Chart Patterns: Head and Shoulders, Triangles and Flags

Chart patterns are recurring shapes that form on price charts because markets are driven by the same crowd psychology — greed, fear, indecision, exhaustion — again and again. Recognizing these shapes early can give a trader a structured way to anticipate where a market might be heading next, though (like every technical tool) with no guarantees attached.

Reversal Patterns

Head and Shoulders

A head and shoulders pattern typically forms after an extended uptrend and consists of three peaks: a left shoulder, a higher head, and a right shoulder roughly level with the left. Connecting the two low points between these peaks creates the “neckline” — a support level that, once broken, is often read as confirming the pattern.

Example: Suppose the FTSE 100 rallies to 7,980 (left shoulder), pulls back to 7,850, rallies again to a higher peak of 8,050 (head), pulls back again to a similar 7,850 level, then rallies a third time but only reaches 7,970 (right shoulder, lower than the head) before falling. A close below the 7,850 neckline is what most traders watch for as confirmation, at which point the pattern’s height (roughly 200 points, from 7,850 to 8,050) is often used to project a rough downside target near 7,650.

The inverse — an inverse head and shoulders — forms after a downtrend and signals a possible bullish reversal, with the same logic applied upside down.

Double Top and Double Bottom

A double top forms when price rallies to a resistance level, pulls back, rallies again to roughly the same level, and fails to break through a second time — suggesting buyers couldn’t sustain the momentum needed for a fresh high.

Example: If USD/JPY rallies to 151.80, pulls back to 150.20, then rallies again to 151.75 before reversing sharply, that near-identical double failure at resistance is a classic double top. A close below the low formed between the two peaks (150.20 in this case) is typically used as confirmation.

A double bottom is the mirror image at support, often signaling a possible bullish reversal after a downtrend.

Continuation Patterns

Triangles

Triangles form when price consolidates within converging trendlines, and come in a few varieties:

• Ascending triangle: a flat resistance level with a rising support line — often seen as bullish, since buyers are willing to pay progressively higher lows while sellers defend the same ceiling.
• Descending triangle: a flat support level with a falling resistance line — often seen as bearish for the mirror-image reason.
• Symmetrical triangle: both boundaries converge toward each other with no clear directional bias, and the eventual breakout direction is less predictable, though it often follows the trend that preceded the triangle.

Example: If oil (WTI) has been rallying and then consolidates between a flat resistance around $74.50 and a rising support line moving from $71.00 up to $73.80 over two weeks, that ascending triangle would traditionally be watched for a breakout above $74.50 — with the height of the triangle (roughly $3.50) sometimes used to project a target near $78.00 once confirmed.

Flags and Pennants

A flag forms as a short, tight consolidation that slopes counter to the prevailing trend, following a sharp preceding move (the “flagpole”). A pennant is similar but converges to a point like a small symmetrical triangle rather than sloping in parallel lines.

Example: If the S&P 500 rallies sharply from 5,150 to 5,400 (the flagpole) and then consolidates in a slightly downward-sloping channel between 5,350 and 5,400 for a week (the flag), a breakout back above 5,400 on renewed buying is typically read as a continuation signal, with the flagpole’s height often used to estimate a rough follow-through target.

Why Confirmation Matters More Than the Shape Itself

Every pattern above is, at its core, built from the same underlying concepts covered in support and resistance explained and how to draw trendlines correctly — a neckline is support/resistance; a triangle’s boundaries are two converging trendlines. Recognizing the shape is only step one; waiting for genuine confirmation is what separates a disciplined trader from someone trading a pattern purely on its visual appeal.

Confirmation generally means:

1. A candle closing beyond the pattern’s key level, not just piercing it briefly.
2. Where volume data is available, a breakout accompanied by above-average volume carries more weight than one on quiet, low-volume trading.
3. Checking whether the breakout direction aligns with the broader trend — continuation patterns that break in the direction of the prior trend tend to have a better track record than reversal patterns fighting an established trend.

False Breakouts Are Common

Just as with horizontal support and resistance, chart patterns fail regularly. A triangle can “fake out” in one direction before reversing hard in the other; a head and shoulders neckline can break, trap sellers, and then snap back above the neckline before continuing the original uptrend. This is exactly why a stop-loss beyond the pattern’s invalidation point (above the right shoulder in a head and shoulders short, for instance) is non-negotiable, regardless of how textbook the pattern looks.

Key Takeaways

• Chart patterns are recurring shapes — head and shoulders, double tops/bottoms, triangles, flags — that reflect repeatable crowd psychology, not guaranteed outcomes.
• Reversal patterns (head and shoulders, double top/bottom) typically form after an extended trend; continuation patterns (flags, most triangles) form as a brief pause within an existing trend.
• Confirmation — a closing break beyond the key level, ideally with volume and trend alignment — matters more than the pattern’s visual shape alone.
• Pattern height is commonly used to project a rough price target, but this is an estimate, not a guarantee.
• False breakouts happen often enough that a stop-loss beyond the pattern’s invalidation point is essential every time.

For the candlestick-level detail that often confirms these larger patterns, see top 10 candlestick patterns every trader should know.

Risk warning: Trading carries a high level of risk to your capital. Chart patterns are a probability-based analysis tool and do not guarantee future price movement. Only trade with money you can afford to lose.