Nüshu 女书 (women's script) is probably the only script in the world used exclusively among women.
— Chenchen Zhang (@chenchenzh) July 21, 2020
It's phonetic (whereas Chinese characters are logographic) and is based on the dialect of Jiangyong, Hunan, where it originated.
There are some origin theories and the one I like pic.twitter.com/lgcpuc17SD