Chart Patterns: Flags, Triangles, Head and Shoulders Explained
Chart patterns are repeating formations in price that signal either a continuation of the current trend or a reversal. Learning to recognise them gives you a structured framework for entries, targets and stops.
Markets are made of human decisions — and humans repeat their behaviour under similar conditions. Chart patterns are the visual result of that repeated behaviour. The same formations appear on a Nifty 50 chart in 2024 and an S&P 500 chart from 1980 because the underlying psychology — greed, fear, indecision, conviction — does not change.
Bull Flag: strong flagpole, orderly pullback in a channel, breakout resumes the trend. Target = flagpole length.
Head and Shoulders: three peaks — left shoulder, higher head, right shoulder. Neckline break confirms the bearish reversal.
Continuation Patterns
Continuation patterns form within an existing trend. They represent a pause — a period where the market catches its breath — before the trend resumes. Trading these patterns means entering in the direction of the original trend after the pause completes.
Bull Flag
A bull flag forms after a sharp, strong move upward (the flagpole). Price then consolidates in a small, slightly downward-sloping channel — the flag. This pullback is orderly and low-volume, suggesting sellers are not in control — just profit-takers. When the channel breaks upward, the original trend resumes.
| Bull flag component | What to look for |
|---|---|
| Flagpole | Strong, fast move upward — 3 to 10 large bullish candles |
| Flag body | Orderly pullback in a downward channel — shallow, not more than 50% of the flagpole |
| Volume | High on the flagpole, drops off during the flag consolidation |
| Breakout | Price breaks above the upper channel line on rising volume |
| Target | Measure the flagpole length and project upward from the breakout point |
Bear Flag Is the Mirror Image
A bear flag forms after a sharp drop (flagpole), consolidates in a slight upward channel, then breaks downward. Everything is reversed — the flag slopes upward, breakout is to the downside, and the target is the flagpole length projected downward from the breakdown.
Pennant
A pennant is similar to a flag but the consolidation forms a symmetrical triangle instead of a channel. After a strong move, price converges — making lower highs and higher lows — compressing into a point. The breakout from the triangle in the direction of the original move is the entry signal.
Reversal Patterns
Reversal patterns signal that the current trend is exhausting and a new direction is beginning. They typically require more confirmation than continuation patterns and take longer to form.
Head and Shoulders (Bearish Reversal)
The Head and Shoulders is one of the most reliable reversal patterns in technical analysis. It forms at the end of an uptrend:
- Left shoulder: price rallies to a high, then pulls back
- Head: price rallies to a higher high (the head) — the final peak of the uptrend — then pulls back to the same support area
- Right shoulder: price attempts another rally but only reaches approximately the level of the left shoulder — failing to make a new high
- Neckline: the line connecting the two pullback lows between the shoulders and head
- Trigger: price breaks below the neckline — the pattern is confirmed
Neckline Break = Entry Signal
The neckline is the key level. Once price closes below it, the pattern is active. The measured target is the height of the head above the neckline, projected downward from the neckline break. Example: head at $120, neckline at $108, head height = $12 → target = $108 − $12 = $96.
Inverse Head and Shoulders: The Bullish Version
The same pattern upside-down signals a reversal from downtrend to uptrend. Left shoulder, head (lower low), right shoulder (higher than the head), then a neckline break upward confirms the reversal.
Double Top and Double Bottom
A double top is a simpler reversal pattern — price reaches the same high twice, failing both times, before breaking down. The two peaks are the 'double top'. The support between them is the neckline. Break below the neckline confirms the pattern. The double bottom is the inverse — two lows at the same level followed by an upside break.
Triangle Patterns
Triangles form as price compresses into a narrowing range. They can resolve in either direction. Three types:
| Triangle type | Shape | Typical resolution |
|---|---|---|
| Symmetrical triangle | Converging trend lines — lower highs, higher lows | Can break either way — wait for the breakout direction |
| Ascending triangle | Flat resistance at top, rising lows — buyers pushing up | Usually breaks upward — bullish continuation bias |
| Descending triangle | Flat support at bottom, falling highs — sellers pushing down | Usually breaks downward — bearish continuation bias |
Volume: The Confirmation Tool
Volume is what separates a genuine pattern breakout from a false one. The rules are consistent across all patterns:
- During pattern formation: volume should decline as the pattern develops — reduced conviction, indecision
- At breakout: volume should increase sharply — strong conviction behind the move
- Low-volume breakout: treat with suspicion — high probability of a false break before the real move
Measuring the Target
Most chart patterns have a measured move target — a way to calculate how far price is likely to travel after the breakout:
| Pattern | Target calculation |
|---|---|
| Flag / Pennant | Length of the flagpole, added to the breakout point |
| Head and Shoulders | Height from neckline to head, subtracted from the neckline break |
| Double top / bottom | Height of the pattern (distance from peaks to neckline), projected from the break |
| Triangle | Height of the triangle at its widest point, projected from the breakout |
Patterns Fail — Have a Stop-Loss Ready
No pattern works every time. A bull flag can break down instead of up. A head and shoulders neckline can hold. Always define your stop-loss before entering a pattern trade: above the right shoulder (H&S short), below the flag low (flag long), or beyond the breakout level. The measured move target is a guide, not a guarantee.
Key Takeaways
- Chart patterns fall into two categories: continuation (trend resumes) and reversal (trend changes).
- Flags and pennants are continuation patterns — brief consolidations before the trend resumes strongly.
- Head and Shoulders is a reversal pattern — three peaks signalling the end of an uptrend.
- Triangles can be either continuation or reversal, depending on the broader context.
- The breakout direction and volume at breakout confirm whether the pattern is playing out as expected.