History of the radiation warning symbol - Nuclear Hitchhiker
https://www.mub.eps.manchester.ac.uk/nuclearhitchhiker/the-history-of-the-radiation-warning-symbol/
Web ResultApr 25, 2017 · The IAEA and the ISO have developed a new ionising radiation warning symbol for category 1, 2, and 3 sealed radioactive sources, to supplement the trefoil sign (Fig. 3). This updated pictogram provides a more intuitive depiction of the hazards and consequences of ionising radiation, which can be universally understood.
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