Trademark
A trademark or trade mark is a distinctive sign or indicator used by an individual, business organization, or other legal entity to identify that the products or services to consumers with which the trademark appears originate from a unique source, and to distinguish its products or services from those of other entities.
Trademarks can act as a form of consumer protection that lowers the transaction costs between a buyer and seller who are not personally acquainted.
Read more about this topic: Government-granted Monopoly