What chart patterns are
Chart patterns are recurring shapes that traders see in price charts and give names to. The idea behind them is that the shapes reflect a contest between buyers and sellers, and that certain shapes have tended to be followed by certain behavior. Pattern reading is part of technical analysis, and it is a descriptive and subjective practice, not a science.
Patterns are usually sorted into two families. Reversal patterns are said to suggest that a trend may be ending. Continuation patterns are said to suggest a pause before the trend resumes. The word “suggest” matters: nothing here is a guarantee, and a pattern can fail at any point.
Reversal patterns
Head and shoulders
This pattern is made of three peaks. The middle peak, the head, is the highest, and the two on either side, the shoulders, are lower and roughly equal. A line drawn through the lows between the peaks is called the neckline. The pattern is traditionally read as a possible end to an uptrend if the price falls through the neckline. An inverted version, with three troughs and the middle one lowest, is read as a possible end to a downtrend.
Double top and double bottom
A double top is two peaks at about the same level with a dip between them. It is read as a sign that buyers failed twice to push through the same price. A double bottom is the mirror image, with two lows at a similar level, read as a sign that sellers failed twice to push lower. Triple versions exist, with three touches.
Rounding tops and bottoms
Slow, curved turns in price, sometimes called saucers, are described as a gradual shift in control from one side to the other. They are hard to define precisely, which makes them particularly subjective.
Continuation patterns
Triangles
A triangle forms when the highs and lows squeeze toward each other. In a symmetrical triangle, highs are falling and lows are rising. In an ascending triangle, a flat upper boundary meets rising lows. In a descending triangle, a flat lower boundary meets falling highs. Triangles are usually read as a period of narrowing price range followed by a breakout, though the direction of the breakout is not known beforehand, and many analysts say each shape leans one way only as a tendency.
Flags and pennants
A flag is a short, tilted rectangle that follows a sharp move, and a pennant is a small triangle in the same position. Both are read as a brief pause before the previous move resumes.
Wedges and channels
A rising wedge slopes upward with converging boundaries, and a falling wedge slopes downward. Wedges are sometimes read as reversal signals and sometimes as continuation signals, which shows how loosely the labels are used. A channel is a pair of roughly parallel lines containing price, and a break out of the channel is watched closely.
Support and resistance
Many patterns are built on support and resistance levels, price areas where a decline or advance has previously stalled. Their meaning comes from the same idea: that the market remembers prior turning points. Levels can hold or fail.
Candlestick shapes
Individual candles and short groups of candles also have names, such as the doji, hammer or engulfing patterns. These come from candlestick charts and are typically treated as very short-term signals, with the same caveats.
How reliable are patterns?
Honest answer: not very reliable on their own, and difficult to test.
- Subjectivity. Where one person sees a head and shoulders, another sees noise. Exactly which peaks count, and where the neckline sits, is a matter of judgment.
- Hindsight. Patterns are easy to spot after the fact. In real time, shapes often look incomplete or turn into something else.
- Chance. Random price movement produces shapes that resemble patterns. Seeing a triangle does not mean there is a cause behind it.
- Failure is common. Patterns frequently fail, and breakouts often reverse, leading to what are called false breakouts.
- Self-fulfilling at best, and unstable. If many traders watch the same pattern and act on it, price may react around those levels for a time. But if everyone knows a pattern, its effect may fade.
- Mixed evidence. Studies of technical patterns in various markets report mixed results, and any apparent advantage tends to shrink once trading costs are counted. Anyone claiming a fixed success rate for a named pattern should be asked for the evidence, and the test method, such as backtesting basics, matters a great deal.
Crypto adds its own complications. Prices are more volatile than in many markets, so patterns can form and break quickly. Thin trading on smaller coins can create shapes that mean little. And trading runs continuously, so there are no daily gaps of the kind that some pattern descriptions assume.
Using patterns sensibly
If you look at patterns at all, a few habits make for a more careful approach.
- Treat them as a way of describing what price has done and where others may be watching, not as predictions.
- Check more than one timeframe, since a pattern on an hourly chart is much less significant than one on a weekly chart.
- Look at whether trading volume or other evidence is consistent with the pattern.
- Know in advance what would show that your reading is wrong.
- Keep position sizing small enough that a failed pattern does not do serious damage.
Cryptocurrency prices are volatile, no pattern reliably predicts what comes next, and people can lose all they invest. This article is educational and is not financial, tax or legal advice.