Fire extinguisher symbols give crucial hazard information using color-coded squares representing different hazards.
The symbols on a fire extinguisher indicate important hazard information based on the National Fire Protection Agency (NFPA) 704 Hazard Identification System.
Red indicates flammability rating, blue indicates health hazard rating, yellow indicates chemical's instability, and white indicates special hazards.
The hazard levels range from 0 to 4, with 0 representing no hazard and 4 being extremely hazardous.
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