-Radioactive material, Type A packages must be marked “Type A”. Type ‘B’ Packages must be marked “Type B (U)” or “Type B (M)” as applicable and Type ‘C’ packages must be marked “Type C”. In addition, if the gross weight is greater that 50 kg, the allowable gross weight of the packages must be marked. Type ‘B’ and Type ‘C’ packages must also have the “Trefoil” symbol embossed or stamped on the outermost receptacle which is resistant to the effects of fire and water (DGR 10.7.1.3).