A certification mark on a commercial product or service is a registered mark that enables its owner to certify that the goods or services of a particular provider have particular properties, e.g., regional or other origin, material, quality, accuracy, mode of manufacture, being produced by union labor, etc. The standards to which the product is held are stipulated by the owner of the certification mark.

A hallmark is an official mark or series of marks struck on items made of metal, mostly to certify the content of noble metals—such as platinum, gold, silver and in some nations, palladium. In a more general sense, the term hallmark can also be used to refer to any distinguishing mark.