beacons, luminous, bells [warning devices], buzzers, dog whistles, electric door bells, flashing lights [luminous signals]/blinkers [signalling lights], fog signals, non-explosive, marking buoys, mechanical signs, naval signalling apparatus, road signs, luminous or mechanical, signal bells, signal lanterns, signalling panels, luminous or mechanical, signalling whistles, signalling buoys, signals, luminous or mechanical, signs, luminous, sirens, traffic-light apparatus [signalling devices], vehicle breakdown warning triangles, whistle alarms.