ISO 361
From HandWiki
ISO 361 Basic ionizing radiation symbol is a hazard symbol for ionizing radiation, described in an international standard that specifies the shape, proportions, application and restrictions on the use of the symbol.
It may be used to signify the actual or potential presence of ionizing radiation. It is not used for non-ionizing electromagnetic waves or sound waves. The standard does not specify the radiation levels at which it is to be used.
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