Keo?
I thought "OK", "Hello", and "Coca-cola" were the most recognizable words in the world. I've never run across "Keo" in English, although "kyo" means "why" in Japanese, and "kio" means "what" in Esperanto (my two most fluent other languages), both in the interrogative sense.
Hmm. I see a pattern. Perhaps if we want to make a project for our descendants 50,000 years hence, we should simply call it "huh?". This is what our descendants will likely think of us (and vice versa, I'm sure)...
Cheers,
Nathan