
1) Warning system
Found on
https://www.crosswordclues.com/clue/hazchem

Hazchem is a warning plate system used in Australia, Malaysia, New Zealand and the United Kingdom for vehicles transporting hazardous substances, and on storage facilities. The top-left section of the plate gives the Emergency Action Code (EAC) telling the fire brigade what actions to take if there`s an accident. The middle-left section gives the....
Found on
http://en.wikipedia.org/wiki/Hazchem

International warning panel designed to alert as to the dangers, characteristics and appropriate accident response to hazardous chemicals and liquids.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.