What radioactive label is for packages with high radiation levels?

Packages with high radiation levels are labeled with a "Radioactive Yellow III" label, which indicates a higher level of radiation than the lower classifications. This label features a trefoil symbol and is used to signify that the package may pose a significant hazard to health if not handled properly. Additionally, it indicates that the radiation level at the surface of the package exceeds specific thresholds, necessitating careful handling and transport protocols.