# Commodity Channel Index (CCI) Commodity channel index: distance of price from its moving average in units of mean deviation, used to spot unusual strength or weakness. ## How to read it - Above +100 shows unusual strength, below -100 unusual weakness. - Moves back inside ±100 can mark the end of an extended move. - Divergences with price warn of fading momentum. ## Key settings - Period 20, constant 0.015, source close. - Levels +100 / -100 with a zone; extremes coloured. ## Good to know - Drawn in its own pane below the chart.