The National Marker Company tag has the legend ?DANGER - DO NOT OPERATE MAINTENANCE DEPARTMENT? on the front and the legend ?DANGER - DO NOT REMOVE THIS TAG - TO DO SO WITHOUT AUTHORITY WILL LEAD TO DISCIPLINARY ACTION! IT IS HERE FOR A PURPOSE? on the back. It is often seen in industrial or manufacturing facilities and hospitals. It has space to mention remarks and personnel details and it urges that the indicated equipment must not be operated. The danger tag uses contrasting colors to ensure clear visibility from a distance and in most lighting conditions. Using safety tags that carry important warnings or status updates are a part of common safety measures in many places.