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They are recognisable by their red-and-white vertical stripes and commonly bear a top sign in shape of a red ball. They either flash Morse code "A" (di-dah), or one long flash, occulting (more light than dark) or isophase (equal light and dark) every 10 seconds (L Fl 10s).
Diagram of cardinal marks as seen during the day, with their light patterns. The lights shown here are configured as "Quick". A cardinal mark is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water.
Signs explaining how to escape from a rip current, posted at Mission Beach, San Diego, California As seen from above, this shows how a rip current works. Breaking waves cross a sand bar off the shore. The pushed-in water can most easily travel back out to sea through a gap in the sand bar.
The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation.
Stinging jellyfish, rays with their whip-like tails and sharks on the hunt are some ocean hazards that might typically worry beachgoers. Six people drowned in rip currents over a recent two-day ...
"You are running into danger." [d] V Victor: Argent, a saltire gules "I require assistance." Velocity in kilometres per hour. W Whiskey: Azure, an inescutcheon gules fimbriated argent "I require medical assistance." X Xray: Argent, a cross azure "Stop carrying out your intentions and watch for my signals." Y Yankee: Bendy sinister of ten or and ...
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A 'Danger' sign from the 1914 Universal Safety Standards. One of the earliest attempts to standardize safety signage in the United States was the 1914 Universal Safety Standards. [1] The signs were fairly simple in nature, consisting of an illuminated board with "DANGER" in white letters on a red field. [1]