This indicator marks big candles (major moves in percentage) on the chart and, more importantly, you will be able to add an alert to them.
Indicator checks if the height (high - low) of last closed candle is bigger than the specified percent of the close of its previous. No matter if the last candle is red or green, the indicator compares the move amount with the previous close. Accordingly, seeing a mark above or below a candle means that there is a large movement in it compared to its previous candles.
Default percentage is 5 but you can change it as you with in the settings and I want to underline that the indicator ignores the non-closed candle at the moment.