Arsenic Compound Liquid N.O.S Hazchem Panel SignThe Arsenic Compound Liquid N. O. S Storage Panel is a safety sign used to label storage areas containing liquid arsenic compounds. "N. O. S" stands for "Not Otherwise Specified," meaning it covers various arsenic based liquids that dont have a specific classification. This panel helps warn workers and emergency responders about the hazardous material inside. It is essential for safety, as arsenic compounds can be toxic if handled incorrectly.