In "smart money concepts", the last opposite-direction candle (or small cluster) before a strong move that breaks structure: the last down candle before a bullish displacement, or the last up candle before a bearish one.
How traders use it: Watched as a possible area for price to return to before continuing. Traders often require that the move from it broke structure and left a fair value gap.
Common mistake: Calling every candle before any move an order block. Without displacement and a structure break, it is just a candle.
Related: Breaker block · Mitigation block · Supply and demand zones · Displacement
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Concepts only. Education only, not financial advice. No pattern on this site has a published win rate.