The Aggressiveness indicator displays how many points the instrument runs on the average for one candlestick
Fig.1 The Aggressiveness indicator
Author: Nikolay Kositsin
Picture above is not correct picture of indicator as indicator plots in separate window (#property indicator_separate_window) and its nto same as at https://www.mql5.com/en/code/1326.
That just showing real quality of author work.
To be honest - basically its quantity over quality - a lot of mistakes are cut pasted over all different indicators from same author (arrays out of range, values are wrong calculated, overflows...).
Source code shows real skills of author.
I strictly suggest not to use any of indicators as they are not reliable.