The icon warns you of the danger of being [https://unicode-table.com/en/1F525/ burned]. Coffee or tea is often sold in insulated [https://unicode-table.com/en/26FE/ cups] with lid. On them post the symbol to the sellers didn't have to pronounce the phrase: "[https://unicode-table.com/en/2621/ Caution], the beverage that you are about to enjoy is extremely hot".