A pin bar (pinocchio bar) is a candlestick with a small real body and one long wick, where the tail makes up most of the candle’s range. The long wick shows price pushed to an extreme during the period and was then rejected back, closing near the open — a rejection of the level the wick reached.
Pin bars are the general price-action family that includes the hammer (long lower wick at a low) and the shooting star (long upper wick at a high). The trade premise is straightforward: a long tail piercing a support, resistance, or supply/demand level and snapping back marks failed continuation, so traders fade the wick in the direction of the body.
Because it is one candle, a pin bar is weak alone and conventionally needs location and confirmation to carry weight. Secuora’s AI backtester exposes a pin-bar primitive, so the otherwise fuzzy “rejection wick” idea can be pinned to exact wick-to-body and wick-to-range ratios and tested across a real sample.