The words, graphics or combinations used in a trademark should have distinctive features and be easy to identify. If a registered trademark is used, it should be marked with "registered trademark" or registered mark. my country’s Trademark Law requires that a trademark must have legal constituent elements, namely text, graphics or a combination thereof, otherwise it cannot be used as a trademark. That is to say, the trademark must be visible, not an audible sound or a smell; the trademark must be flat, not three-dimensional. Trademark marks must be distinctive and identifiable, and must not violate prohibition clauses. The basic function of a trademark requires that the trademark mark be distinctive, cannot be confused with the name of the product, nor be equated with the nature of the product itself, and must be easy to identify. A trademark must be suitable for the characteristics of the goods on which the trademark is used, convey product information, and describe the characteristics of the goods.