【電気】 帰還(きかん), フィードバック 《出力側のエネルギーの一部を入力側へ返還する操作》. (the Procedure where Section of the output of a system is returned to its input as a way to control its even further output) Now It's not necessarily essential for sender and receiver to contact the Bank or each other to acquire details about the transfer; https://heavenarticle.com/author/bankball31-269594/