Wiktionary
countersignal
n. A signal produced in response to another signal.
Usage examples of "countersignal".
Logno had silenced her vital-signs transmissions with a countersignal shield and had brought her to the tower shortly after the arrival of the first refugees from Gammu.
Logno had silenced her vital-signs transmissions with a countersignal shield and had brought her to the tower shortly after the arrival of the first refugees from Gammu.