Arsenic Compound Liquid N.O.S Storage Hazchem Panel SignThe Arsenic Compound Liquid N. O. S Storage Sign is a safety sign used to mark areas where liquid arsenic compounds are stored. "N. O. S" stands for "Not Otherwise Specified," meaning the sign covers various arsenic based liquids. This sign warns workers and visitors about the toxic and hazardous nature of the chemicals, helping to prevent accidents. It is important to follow safety rules when handling or being near these substances.