Where is the UN number (UNN) typically found on hazardous cargo containers?

The UN number (UNN) is typically found on a diamond-shaped placard. This is due to the standardized system for labeling hazardous materials, which utilizes the diamond shape to provide immediate visual recognition of hazards associated with the cargo. The diamond shape helps convey important information quickly to responders and transport personnel, ensuring safety and compliance with regulations. Each diamond placard is clearly marked with the appropriate hazard class and the corresponding UN number, facilitating the identification of the substance being transported. This method of labeling is vital for maintaining safety during the handling and transportation of hazardous materials.