According to Pierre Breesé, the use of this symbol indicates that the previous trademark was legally registered and that anyone using it without authorization risks legal action for damages. Although of American origin under US Trademark Law, this symbol is also incorporated into the provisions of the Madrid Agreement of April 15, 1891.

In France, trademark rights are established upon filing, which means that third parties must recognize the exclusive rights arising from it, even in the absence of an explicit mention. However, the use of this symbol for informational purposes, inspired by American practice, has become widespread to raise awareness among third parties of the existence of these rights. This approach, recommended for educational reasons, clearly indicates that a graphic element or shape constitutes a trademark and thus benefits from legal protection.