It is single Japanese candlestick with long body. The large body of candlestick indicate huge price movement from open to close. Long candle can be bullish or bearish. Long green or white candle indicate there is strong buying pressure while red or black candle indicate there is strong selling pressure. The long candle have more significance if it is formed at major support or resistance level. Remember that long candle alone is not a confirm signal to buy or sell. It can be useful if it used in conjunction with other charts and indicators.