Ionizing-Radiation Warning Symbol
A radiation warning symbol, to supplement the existing trefoil symbol, has been published by ISO as Standard #21482 - Ionizing-Radiation Warning—Supplementary Symbol. The new symbol is a universal radiation warning symbol with the message of "Danger-Stay Away". It is intended for IAEA Category 1, 2, and 3 sources defined as dangerous sources capable of causing death or serious injury. It should be placed on the device housing the source, as a warning not to dismantle the device or to get any closer. Where practical, it should be placed under the device cover such that it is not visible under normal use but would be visible if anyone attempts to disassemble the device. The symbol is not intended for doors or shipping containers.