On a Japanese Candlestick chart, a Marubozu is a single candlestick with no shadow or wick extending from the body at at the open or close. Also known as a shaven or bald candlestick.
The black Marubozu has a long black body and no shadow/wick. The open is the high and the close is the low. This reflects that the bears are in control. The white Marubozu has a long white body with no shadow/wick. The open price is equal to the low and the close is equal to the high, reflecting a bullish period.