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by frogulis 888 days ago
I was wondering the same. After a little searching, I reckon they're referring to 人 on a keyboard using a dàyì layout.

https://en.m.wikipedia.org/wiki/Dayi_method

My first thought was bopomofo ㄚ (which corresponds pleasingly to pinyin "a") but that's just a normally-oriented Y! And it sits on the other side of the keyboard anyway