Common Chart Patterns Explained

Why patterns are probabilities, not certainties

A chart pattern is a repeatable shape in price action that tends to reflect a specific shift in the balance between buyers and sellers. Patterns aren't signals in the sense of a guarantee; they're a summary of crowd behavior that has shown up often enough to have a name. Treat any pattern as a probability that shifts the odds slightly, not a certainty that dictates the next move.

Patterns also mean very little in isolation. The same shape carries different weight depending on the broader trend it appears in, the level of trading volume behind it, and where it sits relative to the support and resistance levels covered in technical analysis basics. Spotting the shape is the easy part; judging its context is where the real skill is.

Head and shoulders: the trend-reversal classic

A head and shoulders pattern forms after an uptrend, with three peaks: a first peak (the left shoulder), a higher peak (the head), and a third peak roughly level with the first (the right shoulder). A line connecting the lows between the peaks forms the "neckline." The pattern is considered complete, and a reversal signaled, when price breaks below that neckline after the right shoulder forms.

The logic behind it: each peak shows buyers pushing price higher, but the failure to exceed the head on the third attempt shows buying pressure fading. The neckline break confirms sellers have taken control. The inverse version, an inverse head and shoulders, forms the mirror image at the bottom of a downtrend and signals a potential reversal to the upside.

Double tops and double bottoms

A double top forms when price hits a resistance level, pulls back, rallies to roughly the same level again, and fails to break through a second time. The two rejections at a similar price suggest that level is a genuine ceiling for now, and a break below the low point between the two peaks is typically read as confirmation of a reversal lower.

A double bottom is the mirror image at a support level: two failed attempts to push price lower, followed by a break above the high point between the two lows. Both patterns are read as a shift from trending to reversing, but like head and shoulders, the signal only really counts once the confirming break happens, not just when the second peak or trough appears.

Triangles: consolidation before a breakout

Triangles form when price consolidates into a narrowing range, drawn as two converging trendlines. A symmetrical triangle has a descending upper line and an ascending lower line, showing neither buyers nor sellers in clear control while the range compresses. An ascending triangle has a flat upper resistance line and a rising lower line, generally read as bullish consolidation. A descending triangle is the reverse, flat support and falling resistance, generally read as bearish.

Triangles don't tell you which direction the eventual breakout goes with any certainty, especially the symmetrical version. What they do reflect is compression: volatility and trading range shrinking before typically expanding again. Traders often wait for a confirmed break of one of the two lines, ideally with a rise in volume, rather than guessing the direction while the triangle is still forming.

Flags and pennants: pauses inside a trend

A flag is a short, roughly parallel-channel consolidation that slopes against the direction of the preceding trend, typically after a sharp move. A pennant is similar but consolidates into a small symmetrical triangle instead of a parallel channel. Both are read as continuation patterns: a brief pause where the market catches its breath before resuming the prior trend, rather than a full reversal.

The key distinction from head and shoulders or double tops is duration and context. Flags and pennants are short-lived, form after a strong directional move, and are expected to resolve in the same direction the trend was already going. When one of these patterns instead breaks in the opposite direction, it's worth treating that as the trend actually reversing, not a normal flag outcome.

Why patterns fail, and how to trade them responsibly

Patterns fail constantly, and there's no version of technical analysis where that stops being true. A head and shoulders can break its neckline and then reverse right back above it. A triangle can break out in one direction only to fake out and reverse within hours. Crypto's thinner liquidity and higher retail participation, relative to traditional markets, tends to make these false breaks more common, not less.

The practical response isn't to ignore patterns, it's to treat them as one input alongside volume, broader trend, and the indicator context covered in indicators 101, and to size and manage positions using the same risk framework from risk management and position sizing that applies to every other kind of trade. A pattern that looks obvious in hindsight rarely looked that clean while it was still forming.