The A with a circle around it and an exclamation mark is the international warning symbol for hazardous materials. It is often seen on products, containers, or vehicles that contain dangerous chemicals or substances which can pose a risk to human health if they are not handled properly. The symbol was created by the United Nations in order to alert people of potential dangers associated with chemical-containing items. This warning symbol serves as a reminder that proper safety precautions must be taken when handling such items, including wearing protective clothing and eye protection, observing safe work practices, and following relevant laws and regulations. Additionally, the A with a circle around it and an exclamation mark should also serve as an indication to those who come into contact with these products that extra caution must be taken in order to avoid any negative impacts from exposure to hazardous materials.