The standardized international ionizing radiation symbol has the three blade segments equidistant from a central circle, with the shapes in black on a yellow background. (Infographic: M.Platonova/ ...

The trefoil radioactive symbol was doodled on a notepad at the ... The blue background was eventually replaced by yellow, which does not fade in sunlight. The use of yellow was standardized ...

Most radioactive sources are used and contained inside a larger piece of equipment, protected by heavy shielding. The black, magenta or yellow trefoil symbol or the words “radiation” or “radioactive” ...

AT THE ENTRANCE to the “Zone of Alienation” around the Chernobyl Nuclear Power Plant in Ukraine stand two kiosks, painted a radioactive shade of yellow ... the radiation symbol, gas masks ...