danger signal

See: symptom
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References in classic literature ?
Over the tops of them was seen a green light, something like the danger signal at a railway-crossing.
The US forces fired warning flares and sounded a danger signal but the Iranian ship continued inbound.
Considering the strength of cyclone Mora, Bangladesh Meteorological Department has categorized danger signal number 7 to Chittagong Metropolitan Region and Cox's Bazar area.
The lieutenant said the Mahan "made several attempts to contact the Iranian vessel by bridge-to-bridge radio, issuing warning messages and twice sounding the internationally recognized danger signal of five short blasts with the ship's whistle, as well as deploying a flare to determine the Iranian vessel's intention".
The "Mahan made several attempts to contact the Iranian vessel by bridge-to-bridge radio, issuing warning messages and twice sounding the internationally recognized danger signal of five short blasts with the ship's whistle, as well as deploying a flare to determine the Iranian vessel's intentions," McConnaughey said in a statement to The Associated Press.
Researchers hypothesized that bees would convey this danger signal by doing a waggle dance - behavior that directs other bees to a food source based on the position of the sun.
He sends Vic a journal with the word "oxblood," their danger signal.
According to danger theory only an alert or group of alerts can be considered valid (dangerous) if they initiate the danger signal.
The first step is to recognize the danger signal and then to classify danger signals into different levels (Mahira et al.
I was in the living room when Petal jumped up and alerted me, then dropped using the danger signal.
The rooms, or specific elements, may be set to provide certain danger signals to the trainees; for example, if a room is on fire a light will provide a danger signal.
Most of the genes that became active were located in the plant tissues directly exposed to the extracts, but some unexposed tissues reacted as if they had picked up a systemwide danger signal.