ATR: Average True Range: https://python.stockindicators.dev/indicators/Atr/ significance: falling -> decline in volatility rising -> incline in volatility formula: first ATR: subsequent ATR: relevant: summation: references: https://en.wikipedia.org/wiki/Average_true_range https://www.investopedia.com/terms/a/atr.asp https://stackoverflow.com/questions/40256338/calculating-average-true-range-atr-on-ohlc-data-with-python