Anti heater ooze contaminatioin (AHOC)
Anti heater ooze contamination or AHOC is a way of keeping the strings of ooze that come out of your nozzle away from the heaterblock of your extruder.
Without AHOC the ooze will stick to the heater and in time create a blob of filament on the heater that at 1 point will drop in the object that is being printed.