A Tail is understood by traders to mean a lower shade or wick; i.e. the distance between the maximum opening price and maximum closing price on a Japanese candle over a trading period. Long shades indicate high trading activity which results in the price moving far from the opening/closing price. Short shades mean the price staying has stayed close to opening/closing price. A tail helps traders to identify who is dominating the market at a specific moment in time: the buyers or the sellers.