signalling

/S IH1 G N AH0 L IH0 NG/
verb
  1. 1

    To indicate; to convey or communicate by a signal.

  2. 2

    To communicate with (a person or system) by a signal.

    โ€œSeeing the flames, he ran to the control room and signalled headquarters.โ€

noun
  1. 1

    The use of signals in communications, especially the sending of signals in telecommunications

  2. 2

    The signals and associated equipment required for their operation.

Source: https://en.wiktionary.org/wiki/signal, https://en.wiktionary.org/wiki/signalling