Chart pattern
A repeatable configuration of price (and sometimes volume) used in technical analysis — a flag, a double top — always with a definition of invalidation.
Definition
A chart pattern is a repeatable configuration of price (sometimes with volume) — a flag, a double top, a head and shoulders — used as a hypothesis about continuation or reversal. Without an invalidation level and risk management it stays a sticker on the chart, not a setup.
Example
On the D1 chart you see a double top at resistance with a clear trough between the two peaks. A short setup only makes sense once that trough breaks (or once your defined rule triggers), with a stop above the structure and a size within 1–2% risk.
Anti-example / common mistake
“I see a pattern, so I enter immediately” without trend context and without invalidation. A common overfit: matching a pattern name to every candle instead of waiting for confirmation that fits the plan.