It denotes the summed signals of the active indicators. Buy signals are added, sell signals are subtracted. The weight of each indicator can be controlled by the value returned in its check method. For now, the default is 1 and the only exception is RSI (which can return double its weight on extreme values). Currently the weights are hardcoded but after the reworks they can be assigned in the config.

Was the use of the word unfamiliar? I just remember it being used in a similar "confluence of indicators" context somewhere.