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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.
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.
The intention of not including the backing board is to emphasise on the intended shapes and design of the signs. Backing boards are placed to increase visibility. 19:52, 6 February 2014: 505 × 505 (10 KB) Fry1989: The backing board IS part of the sign, the official schematics include it: 16:45, 6 February 2014: 550 × 485 (4 KB) Woodennature
The polar bear warning sign in Svalbard recently changed from displaying a black bear on white background to a white bear on black background (both signs are triangular with a red border). Some countries (like France, Norway and Spain) that normally use a white background have adopted an orange or amber background for road work or construction ...
ISO 3864-1:2011 Part 1: Design principles for safety signs and safety markings [1] ISO 3864-2:2016 Part 2: Design principles for product safety labels [2] ISO 3864-3:2012 Part 3: Design principles for graphical symbols for use in safety signs [3] ISO 3864-4:2011 Part 4: Colorimetric and photometric properties of safety sign materials [4]
The intention of not including the backing board is to emphasise on the intended shapes and design of the signs. Backing boards are placed to increase visibility. 19:52, 6 February 2014: 505 × 505 (14 KB) Fry1989: The backing board is part of the sign, the official schematics include it: 16:43, 6 February 2014: 557 × 492 (8 KB) Woodennature
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. This flow creates a fast-moving rip current.