NFPA 704
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"NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response" is a standard maintained by the U.S.-based National Fire Protection Association. Wikipedia
ACID: Acid or alkaline, based on the pH scale
BIO: Biological hazard (e.g., flu virus, rabies virus)
COR: Corrosive; strong acid or base (e.g., sulfuric acid, potassium hydroxide)
CRY: Cryogenic (e.g., liquid nitrogen)
POI: Poisonous (e.g., strychnine, alpha-amanitin)
RA: Radioactive (e.g., plutonium, cobalt-60, carbon-14)
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