The formation indicates either a trend reversal from bearish to bullish or continuation of a bullish trend.
A Bullish Strong Line needs confirmation not only in terms of the next candle formed in the trend, but also in terms of how close it has appeared to a trend line and a long-term moving average.
If it is accompanied by breakout from a downward sloping trend line, it would indicate a possible increase in the upside momentum.
It might look similar to a White Marubozu or a Long White Candle.
The only difference is that it would give a strong bullish signal if there is breakout of the trendline.
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