Which hazard classification is indicated by the flame symbol?

The flame symbol is specifically associated with flammable or self-heating substances, which is why the answer is correct. This symbol serves as a visual warning that the material has the potential to ignite easily, posing a significant risk of fire or explosion under certain conditions. Flammable substances can catch fire when exposed to an ignition source, and self-heating substances can spontaneously ignite without an external flame, making awareness of this hazard critical in handling and storage procedures.

In contrast, though oxidizers can also promote combustion, they are not directly indicated by the flame symbol. Corrosives are substances that can cause damage to living tissue or materials, which is represented by a different symbol, typically depicting a test tube and hand. Explosives, while dangerous, are denoted by symbols that signify the potential for an explosion rather than simply being flammable. Each hazard classification has its own specific iconography designed to communicate the relevant dangers effectively and ensures that those handling these materials understand the associated risks.