I am a light, set up to guide your steps, and to warn you from danger. I am a beacon,

I am a light, set up to guide your steps, and to warn you from danger. I am a beacon, which exhibits a friendly mark to point out the way, and to show where there are beacons to direct you. I am a buoy, which exhibits a mark to show where there are channels to be followed, and where there are beacons to direct you. I am a light, a beacon, and a buoy, to guide your steps, and to prevent