Who is that, Brendan? I think we can be more direct now the blog is up (I hope others agree).
Apparently this one is fully cryptic so we may not just be looking for a word that's spelt P symbol O. There's a song by Charles Aznavour called "Quiet Love" but that would mean a blank square (space bar?) Nah.
From what Penumbra says it could be something like P*O to signify the novel Starinpo by that well-known writer, Charles Gwit...