Other hyponyms of signalling include
recording,
number,
phone number,
telephone number,
start,
starting signal,
storm signal,
beam,
radio beam,
ticktack,
time signal,
dog-ear,
animal communication,
alarm,
alarum,
alert,
warning signal,
distress call,
distress signal,
all clear,
curfew,
retreat,
drumbeat,
radiotelegraphic signal,
telegraphic signal,
whistle,
whistling,
high sign,
symbol,
visual signal,
indicator,
electronic signal,
radio beacon,
input,
input signal,
output,
output signal.