Nüshu, the 19th-Century Chinese Script Only Women Could Write. This gender-specific practice continues to fade with time. https://www.atlasobscura.com/articles/nushu-chinese-script-women …pic.twitter.com/YWzSVPNFCP
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In Japan most kids learn this in middle school, so it's fairly common knowledge. Also relatively common knowledge among foreigners who learned Japanese I suppose
Just a tweet for clarification: I was saying hiragana originate from something (what came before hiragana) and you were saying hiragana originate as something (hiragana began as something when it first appeared). The ambiguity in language and word usage... 
Nope, hiragana came from the cursive form of Chinese calligraphy: the cursive script is NOT female-specific. But when Hiragana first appeared, it was popular among the Japanese women; that’s why it’s known as 女手 onnade, which is not 女書 (nüshu) from China. The causal 1/2
relationship is different from what you described. 2/2
Please note that nüshu 女書 has never been a big thing in Chinese culture and history; it’s used in a limited geography over a limited (but uncertain) time period. As a Chinese I’m pretty certain about this; I learned Japanese when I was about 15, ~30+ yrs ago, though not native.
PS. After thinking about your tweet again, I guess probably we meant different things when we used “originate”: I was referring to the origin, the source, whereas you meant “when it first started”... It looks like this is where our differences originated. 
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