I was working on psychiatric ward in Portsmouth with paitiens with mania, self harming, depression and other mental illnesses.
I hear as someone sad twotoone. I didnt understand what thas it means so I asked them If they can explain it to me. And they sad Two To One ( 2 in 1) what means schizophrenia. I already knew what I want to do so it was beutiful world to use it as cross, and other words use as numbers. You say but why not O but 0 and so complicated name for it. In my opinion every human know difference betwen 0 and O. And we are also educational program and we want to people know and learn.