OsMa is an oscillator of a moving average (OsMA) is a technical indicator showing the difference between an oscillator and its moving average. It is a useful tool to identify whether a market is overbought or oversold. Commonly the value displayed by the OsMA indicator is most often derived from the MACD indicator. The MACD has a signal line, which is a built-in moving average. The OsMA is the difference between MACD line and this signal line.
OsMA = MACD – signal