advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware black care caution communicating communication concern danger informing Look looking lookout no-assistance no-lifeguard risk risks risky safety sign signage swim swimming warning warning-sign water white beach guard lifeguard safe sea assistance buoyancy circle circular flotation-device information kisby-ring lettering life-preserver life-saving-buoy lifebelt lifebuoy lifering lifesaver message perry-buoy personal-protective-equipment pool red rescue-aid rescue-device ring-buoy safety-device swimming-pool boat empty lake lonely pond sand shadow shore signs surf surfer surfing wave windsurfer