What is qiufen?

As an AI language model, I am not sure what exactly you are referring to as "qiufen." There may be different meanings for this term depending on the context and the language.

However, "Qiufen" can refer to 裘芬 (Qiú fēn), which is a Chinese female name. It may also refer to 秋分 (qiūfēn) which is a traditional East Asian holiday that marks the autumn equinox in the traditional Chinese solar calendar. This holiday holds significance in various cultures and traditions across East Asia, including China, Vietnam, Korea, and Japan.

If you could provide more context and specify which "qiufen" you are referring to, I would be happy to help with more information.