The NFPA uses only one symbol — a four-sided diamond evenly divided into four smaller, colored diamonds that each contain a number or symbol. The top red diamond typically contains a number from 0 to 4, which represents a scale for a chemical's flammability. The left blue diamond contains...
presenting a risk or potential risk to the well-being of man.” The symbol design must conform to the design as shown in the “BIOHAZARD” sign and contain the word “Biohazard” or “Biological Hazard.” The biohazard symbol can be black, fluorescent orange, or orange-red color. Backgr...