Alternative term: Return signal
In a closed loop, the signal resulting from an input signal and transmitted by the loop and
intended to be algebraically added to the input signal.
Figure 2 - Block diagram of automatic control system (5-2-045) incorporating a closed loop (5-2-080)
Reference: ANSI (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM