There is no information saying that triangles cannot be used as registered trademark patterns.

In modern Chinese trademarks, triangles are not a common figure. They are mostly used as trademark trims or borders, embellished with various decorative patterns or main patterns.

For example, the "Triangle" brand Chinese medicine trademark used by Shanghai Sanyou Industrial Co., Ltd. is a typical example. In addition, there are also trademark patterns represented by triangles alone, such as the "Triangle" brand ice and hot water bottle trademark used by Shanghai Zhengyi Industrial Co., Ltd. This extremely simple form of expression has extremely prominent visual effects and alternative aesthetic styles in trademark design in the 20th century, making such trademarks easy to identify and easy for consumers to remember.