Which hazard class uses the flame pictogram on its labels?

• A. Class 4 Substances
• B. Class 9 Miscellaneous
• C. Class 2 Gases
• D. Class 3 Flammable liquids

Answer: (D)

Pictograms on labels communicate hazard at a glance, and the flame symbol is the universal indicator of flammability. This flame icon is used on labels for flammable liquids so handlers know the material can ignite easily and must be kept away from ignition sources. Among the options, the category that uses this flame pictogram to signal its primary hazard is flammable liquids. Other classes involve different symbols for their specific risks (gases have their own signaling, miscellaneous hazards use other icons), so the flame pictogram matches the flammable liquids category most directly.