In 2011, the trefoil was registered by the International Organization for Standardization (ISO) to be recognized internationally as a ‘Warning; Radioactive material or ionizing radiation’ symbol. The ...

Research suggests that as little as 6% of the world’s population recognizes the “universal” radiation warning sign of a trefoil against a yellow background. For around five decades ...

Refers to the latest 2 years of stltoday.com stories. Cancel anytime. A radiation warning sign hangs on a fence at the West Lake landfill in Bridgeton on March 13, 2012. ST. LOUIS — A law that ...

Contaminated properties near Coldwater Creek in north St. Louis County will have new warnings until radiation in the area can be removed. In a news release, the Army Corps of Engineers said it St ...