I'm so out of it when it comes to the abundance of abbreviations these days....at first I wondered if a Yi was anything like a Wii...some new electronic gadget maybe. Sorry to hear it is actually way less fun than a new gadget. Interestingly, I used to get the occasional 'yi' when I was younger, but it's been many years now. I do still get a 'ui' once every few years (not to be confused with 'gui'!).