This is a pill surrounded of the nuclear sign. It means that if there is an accident, pills are available to protect citizens' health. Although Nuclear Power is a secure method of producing electricity, each Swiss citizen who lives within 20 km of a nuclear plant receives a pack of Potassium Iodine. Information (1) http://en.wikipedia.org/wiki/Potassium_iodide / Information (2) http://www.mandcgroup.ie/iopen24/blog.php?blog_id=153 Information (3) http://saveourbones.com/iodine-your-thyroid-and-your-bone-health/
Standard Red and Black "Danger" sign with wording Do Not Enter. Note that Do Not Enter signs are available in Caution, Danger, Notice, Warning (green) and Warning (orange) in this collection