We've had something similar (break-away torque) for a motor (ref. 1), but it's the same in principle:
"A variety of test procedures are available. In order of importance, these are test torque, breakaway torque and inspection torque. ... Breakaway torque is the torque measured when initial relative motion between the test nut and bolt occurs in a joint with or without preload. The direction of the applied force, tightening or loosening, is differentiated at the breakaway moment." (ref 2)