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warning signal
environ.	alarme de aviso; sinal de alerta
IMF.	sinal de advertência
mater.sc.	sinal de aviso
med.	sinal luminoso de alerta
railw., sec.sys.	sinal de aviso de aproximação
telegr.	sinal avisador

warning signal: 8 phrases in 4 subjects

Communications	4
Lighting other than cinema	1
Rail transport	2
Transport	1