The RVI Indicator is a useful and popular Forex indicator that can be used in the MT4 trading platform. The RVI Indicator measures the difference between the closing prices of a currency pair in a given period of time and then divides it by the sum of the absolute values of the differences. This calculation results in a value that ranges from 0 to 100. A higher value indicates a stronger trend in the market while a lower value indicates a weaker trend. The RVI Indicator is a great tool that can be used to help traders identify potential opportunities in the Forex market.