according to relevant regulations and policies, the word signboard is not listed as a prohibited word at present. In the Chinese context, signboards usually refer to the signs on the doors of shops, restaurants or enterprises to show their names or characteristics. As a business term, it is widely used in advertisements and commercial propaganda, and has not been prohibited or restricted.

therefore, you are free to use the word signboard in appropriate occasions, such as business activities, marketing or product promotion. Of course, in specific cases, such as brand registration and trademark use, we still need to follow the corresponding legal provisions and intellectual property protection principles. Maintaining attention to and compliance with relevant laws and regulations can better protect your rights and interests.