trademark infringement
The unauthorized use of a trademark — or of a confusingly similar name, word, symbol, or any combination of these — in connection with the same or related goods or services and in a manner that is likely to cause confusion, deception, or mistake about the source of the goods or services. See LIKELIHOOD-OF-CONFUSION TEST. [Cases: Trade Regulation 332. C.J.S. Trade-Marks, Trade-Names, and Unfair Competition § 72.]