This new symbol (ISO 21482), a triangular shape with three icons - the trefoil emitting radiation, a skull and a man running away - is meant to warn of the presence of dangerous levels of ionizing radiation on large sealed radioactive sources. The symbol conveys: Danger - Run Away – Do Not Touch. The new symbol does not replace the old one but is in addition to it. IAEA recommends that the symbol may be used on IAEA Category 1, 2 and 3 sealed radiation sources.
The trefoil symbol, the magenta image (Berkeley Lab, US) on a yellow background is being used for decades to denote / warn the presence of radioactive material. The history of the symbol is not very clear, though as it looks today, it originated from Oak Ridge National Lab in late forties. The symbol, however, has little recognition beyond the nuclear community.
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