Parabolic SAR
Parabolic SAR is a technical analysis chart overlay that uses a series of stop-and-reversal indications to determine good entry and exit points. When the price rate is above the Parabolic SAR it is a sign of a buy and when the price rate is below the Parabolic SAR it is time to sell. The strategy was developed by J. Welles Wilder who also developed other indicators such as the Relative Strength Index, Directional Movement Indicator, Average Directional Index, and Average True Range.