Mathprofrockstar, thanks. Pi , pious, is used a lot - too much even? - in crosswords here. As Brendan said earlier, it's in another of the weekend puzzles. I think we see it, somewhere, around once a month!
Mathprofrockstar, I have never heard anyone use the word, not in my own world, not on television, not in a book. I think it's in that select group of words that appear only in crosswords!