Window (gap)
A gap between two consecutive candles where no trading occurred — in Japanese candlestick theory, windows act as support/resistance the market tends to return to.
In Japanese candlestick terminology, a window (or ku) is a price gap between consecutive candles — a zone where no trading took place. A rising window (bullish gap) occurs when the current candle's low is above the prior candle's high; a falling window (bearish gap) is the reverse.
The old Japanese saying is "prices return to close the window" — gaps tend to act as magnets. A rising window acts as support on subsequent pullbacks; a falling window acts as resistance on subsequent rallies. In reversal patterns like the Abandoned Baby, the gaps around the star candle are what make the pattern significant.
On the desk
After a strong earnings beat, a stock gaps up and never fills the gap over the next three weeks. When price finally pulls back to the gap zone, buyers step in again — the window held as support exactly as the pattern implies.