What is the '704' sign that I see posted on some pesticide storage facilities?

Pesticide Environmental Stewardship April 23, 2012|Print

The National Fire Protection Association (NFPA) 704 standard provides a way to communicate the potential hazards of storing hazardous chemicals through the posting of a diamond shape or square-on-point shape sign. The sign addresses the health, flammability, instability, and related hazards associated with short-term exposures that are most likely to occur as a result of fire, spill, or similar emergency. The 704 standard is applicable to industrial, commercial, and institutional facilities that manufacture, handle, or store hazardous materials.  Refer to the following web page for more details on this standard: FAQ - NFPA 704 from the National Fire Protection Association.

NFPA 704 sign