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  Hazard Symbols
Many countries require Hazard Symbols labeled on the containers of chemicals . These symbols have the following meanings:

　E: Explosive
　E: Explosive

　T: Toxic
　T: Toxic

　O: Oxidizing agent
　O: Oxidizing agent

　Xn: Harmful
　Xn: Harmful

　F++: Extremely flammable
　F++: Extremely flammable

　Xi: Irritant
　Xi: Irritant

　F+: Highly flammable
　F+: Highly flammable

　C: Corrosive
　C: Corrosive

　F: Flammable
　F: Flammable

　N: Dangerous for the environment
　N: Dangerous for the environment

　T+: Very toxic
　T+: Very toxic