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