The MACD Histogram (Moving Average Convergence Divergence Histogram) provides far earlier and more responsive signals than the original MACD, but is also more volatile.
MACD Percentage Price Oscillator is a variation of the MACD indicator. The major difference is the percentage scale which enables comparison between stocks.
The Moving Average smooths price data to create a powerful measure of trend direction. Simple, weighted and exponential moving averages are most popular.