Standby current
also known as: Quiescent current · Sleep current · Off-state draw
What a circuit draws when everything that can sleep is asleep. 'Off' almost never means zero: voltage dividers, pull-ups, regulator quiescent current, and diode leakage have no sleep mode — they set a floor the design can never beat.
In practice
The classic mistake: a microcontroller sleeping at 10 µA next to a feedback divider burning 100 µA forever. Battery life is set by the floor, not the average. Add up the always-on paths first; the engine computes this floor exactly from the schematic.