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_me

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 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