term:

Certification Mark

certification mark

Any word, name, symbol, device, or any combination, used, or intended to be used, in commerce by someone other than its owner, to certify regional or other origin, material, mode of manufacture, quality, accuracy, or other characteristics of such person's goods or services, or that the work or labor on the goods or services was performed by members of a union or other organization.

Source: U.S. Patent and Trademark Office