Zero line crossover: A crossing of the MACD line through zero happens when there is no difference between the short and long EMAs. A move from positive to negative shows a downward trend in the data, and a move from negative to positive shows an upward trend.
MACD signal line: An EMA of the MACD measurement.
Signal line crossover: The MACD line crossing over the signal line indicates that the trend in the data is about to accelerate in the direction of the crossover. It is an indicator of momentum.
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