Chart patterns are recurring shapes that price tends to carve out as buyers and sellers fight for control, shapes that recur across different assets and different decades because the underlying psychology behind them, hesitation, accumulation, panic, relief, repeats itself. This article covers three of the most reliable and widely traded patterns: the flag, the triangle, and the head and shoulders. Wherever this series has real, verifiable market data that shows a pattern clearly, we use it. Where the right historical example is not present in our current dataset, we use a clearly labeled schematic diagram instead of pretending an invented chart is real data.

Continuation patterns versus reversal patterns

Before naming individual shapes, it helps to sort patterns into two families. Continuation patterns form during a pause in an existing trend and typically resolve in the same direction the trend was already moving, essentially a rest stop rather than a turning point. Reversal patterns form after an extended move and signal that the prevailing trend may be running out of steam and is at risk of turning the other way. Flags and triangles are usually continuation patterns; the head and shoulders is a classic reversal pattern. Knowing which family you are looking at changes what you should expect the pattern to do once it resolves.

The flag: a real example from AAPL

A flag forms when a sharp, strong move (the flagpole) is followed by a brief, controlled, sideways or slightly counter-trend consolidation (the flag itself), before the original move resumes. The real AAPL data from this series shows a clean example of exactly this shape.

Data: TipRanks historical prices, AAPL daily candles, Aug 8 – Aug 29, 2025.

The flagpole here is the sharp rally off the August 1 low, which carried AAPL from roughly $201.50 to above $229 in about a week, a genuinely powerful move. What follows, from roughly August 11 through August 22, is the flag itself: a contained, sideways range between approximately $224.50 and $233.50, where neither buyers nor sellers could gain decisive control. By August 27 and 28, price pushed back above the top of that range, and the original uptrend resumed, eventually carrying AAPL to fresh highs through September. This is the defining feature of a flag: a pause that resolves in the same direction the prior move was already heading, which is precisely why flags are classified as continuation patterns rather than reversal patterns.

The triangle: converging support and resistance

A triangle, most commonly seen as an ascending triangle in an uptrend, forms when price tests a flat resistance level multiple times while the pullback lows between each test get progressively higher, squeezing price into a narrowing range that looks like a triangle when you connect the highs and the lows. The current AAPL dataset used throughout this series does not happen to contain a clean, multi-week triangle, so the diagram below is a schematic illustration built specifically to show the shape clearly, not a real chart.

Schematic illustration, not real market data, created to show the general shape of an ascending triangle.

The flat top represents a resistance level that sellers defend repeatedly. The rising bottom represents buyers becoming more aggressive each time, refusing to let price fall back as far as the previous dip. As the range narrows, the contest typically resolves with a breakout in the direction of the rising line, here drawn as an upside break above resistance, because the buyers’ increasing aggression is read as the more dominant force heading into the squeeze. A descending triangle is simply the mirror image, with a flat support level and progressively lower highs, typically resolving downward.

The head and shoulders: a classic reversal

The head and shoulders pattern forms after an extended uptrend and signals a potential transition to a downtrend. It consists of three peaks: a moderate peak (the left shoulder), a higher peak (the head), and a second moderate peak roughly similar in height to the first (the right shoulder), with a connecting line called the neckline drawn across the two pullback lows between the peaks. Like the triangle, this exact shape does not appear in the current AAPL window used in this series, so the diagram below is again a clearly labeled schematic rather than real data.

Schematic illustration, not real market data, created to show the general shape of a head and shoulders pattern.

The pattern is considered complete, and bearish, once price closes decisively below the neckline after forming the right shoulder. A common, rough way to estimate a downside target is to measure the vertical distance from the head down to the neckline, then project that same distance downward from the point where the neckline breaks. As with every pattern in this article, this measurement is a guideline based on historical tendency, not a guaranteed outcome, and the pattern fails on a meaningful percentage of real attempts, which is exactly why it should never be traded without the risk management framework covered earlier in this series.

Why patterns fail, and how to handle it

Every chart pattern is a probability, not a certainty, and every single one of the patterns above fails a meaningful percentage of the time in real trading: flags sometimes break the wrong way, triangles sometimes squeeze and then fail to follow through, and head and shoulders patterns sometimes form what looks like a complete right shoulder and then simply continue higher instead of reversing. This is precisely why a pattern should never be the entire basis for a trade. The pattern identifies a setup worth paying attention to; a predetermined stop-loss, placed at the price that would prove the pattern wrong, such as back above the flag’s upper boundary or back above the head and shoulders’ right shoulder, is what protects you when that setup does not work out.

Practical guidelines for trading patterns

• Identify which family a pattern belongs to, continuation or reversal, before forming any expectation about which direction it should resolve.
• Wait for the pattern to actually complete, meaning price has decisively broken the relevant boundary, the top of a flag, the trendline of a triangle, or the neckline of a head and shoulders, rather than anticipating the break in advance.
• Watch volume around the breakout where available; a genuine breakout is generally accompanied by a noticeable pickup in volume, while a break on very light volume is more likely to fail.
• Always define your stop-loss based on what would prove the pattern wrong, not an arbitrary percentage, exactly as covered in the risk management article earlier in this series.
• Treat every pattern as a probability that improves your odds, not a certainty; the position sizing techniques in the next article exist precisely because even good patterns fail sometimes.

Measuring price targets from a pattern

Each pattern in this article comes with a rough, commonly used technique for estimating how far price might travel once the pattern resolves, and it is worth making these explicit since the head and shoulders section above already introduced the general idea. For a flag, the standard measuring technique projects the height of the flagpole, the sharp initial move before the consolidation began, forward from the point where price breaks out of the flag. Applied to the real AAPL example in this article, the flagpole ran from roughly $201.50 to $229.35, a gain of about $27.85; projecting that same distance from the breakout point near $233.50 suggests a rough target in the area of $261, a level the real data does approach by the end of this series’ dataset, closing at $254.63 on September 30 and continuing to climb in the days just beyond this window. For a triangle, the standard technique instead measures the height of the triangle at its widest point, near the left-hand side where the pattern begins, and projects that same distance from the breakout point in the direction of the break.

These measuring techniques are deliberately rough, and experienced traders treat the resulting number as a general area to watch for potential resistance or profit-taking rather than a precise target to set and forget. They are most useful in combination with the support and resistance concepts covered earlier in this series; a measured target that happens to land directly on a pre-existing resistance level from prior price history carries considerably more weight than one that lands in an area with no other supporting evidence.

Two more patterns worth recognizing

Beyond the three patterns covered in depth above, two additional shapes are common enough to be worth a brief mention. A double top forms when price rallies to a peak, pulls back, rallies again to a very similar peak, and then fails to make a new high, often signaling exhaustion in a similar way to the head and shoulders pattern but with a simpler two-peak structure rather than three. A double bottom is the mirror image, two similar troughs separated by a moderate rally, often marking the end of a downtrend. Both patterns are read using the same core logic as the patterns covered above: a clearly defined level, the low between the two peaks for a double top or the high between the two troughs for a double bottom, that price must break decisively before the pattern is considered confirmed, and a measured move technique, here using the height between the peaks or troughs and that middle level, for estimating a rough target.

Patterns are easier to spot in hindsight than in real time

One honest caveat deserves emphasis. Every chart pattern in this article looks far cleaner in a finished, historical chart than it does while it is actually forming in real time, when you do not yet know whether the right shoulder will complete at a similar height to the left, or whether a sideways consolidation will resolve as a flag or simply break down into something else entirely. This is not a flaw specific to beginners; it is an inherent feature of pattern-based trading. The practical implication is to wait for a pattern to genuinely complete, meaning the relevant boundary has actually been broken with a real, closed candle rather than just a brief intraday poke through the line, before treating it as a confirmed signal rather than a tentative possibility still being formed.

Timeframe matters for every pattern

Every pattern covered in this article can form on virtually any timeframe, from a 5-minute chart to a monthly chart, and as a general rule, the same pattern shape carries more weight the longer the timeframe it forms on. A flag visible on a weekly chart, built from many weeks of genuine consolidation, generally represents a more significant, more reliable pause than a superficially similar-looking flag that formed over just a few hours on an intraday chart, simply because far more total trading activity, and therefore far more genuine consensus among market participants, went into building the longer-timeframe version. This is part of why the multi-timeframe analysis covered later in this series matters even when applied specifically to pattern recognition: a pattern that appears on both a daily and a weekly chart simultaneously is considerably more trustworthy than the same-looking shape that only shows up when you zoom into a single short timeframe.

Key takeaways

• Continuation patterns like flags and triangles form during a pause in a trend and typically resolve in the same direction the trend was already moving; reversal patterns like the head and shoulders signal a potential change in direction.
• The real AAPL data shows a clear flag pattern between Aug 8 and Aug 29, 2025: a sharp flagpole rally followed by a contained consolidation, resolving back upward.
• Triangles squeeze price between a flat boundary and a converging trendline, typically breaking in the direction the converging line is sloping.
• A head and shoulders pattern completes once price closes decisively below the neckline after the right shoulder forms, and a rough downside target can be estimated by projecting the head-to-neckline distance below the break.
• Every chart pattern fails a meaningful percentage of the time, which is why a predetermined stop-loss based on what would invalidate the pattern is essential, never optional.

Disclaimer

This article is for educational purposes only and does not constitute financial or investment advice. Chart patterns reflect historical price behavior and do not guarantee future outcomes. The flag pattern shown here uses real historical AAPL data; the triangle and head and shoulders diagrams are schematic illustrations created to show the general shape of those patterns, not real market data. Always do your own research and consider consulting a licensed financial advisor before trading or investing.