The up/down gap side-by-side white lines is a three-candle continuation pattern that occurs on candlestick charts.

The up version is a white candle followed by a gap up and two white candles of similar size.

The down version is a black candle followed by a gap down and two white candles of similar size.

The pattern is a continuation pattern, meaning the price is expected to move in the direction of the trend (first candle), following the pattern.