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A trefoil on a diamond, with a category bar.
Also known as: Radioactive placard, Class seven placard, Radioactive material label
In dangerous-goods transport the radioactive placard carries the radiation trefoil, with a category shown by red bars indicating the radiation level at the package surface.
Marks a load of radioactive material, the trefoil identifying the hazard.
Contexts: Packaging
Carries one, two or three red bars for categories rising with the radiation level at the package surface, so the number of bars is itself a measurement.
Contexts: Packaging
A diamond with the three-bladed trefoil in the upper half, a lower half carrying one, two or three red bars, and the class figure at the bottom point.