> Taxi is pretty much universal, isn't it?

Taxi seems like a pretty good candidate, doesn't it?
I remember when I was in Turkey a few years ago that I was quite struck by the way it is presented on the taxis there - 'TAKSI' - it was, I think, the first country I've visited that didn't have TAXI written. In Asia, at least, TAXI is often written *as well as the country's own typographical version, is it not?