No, I hadn't heard of it either until I just did a search on "bony protuberrance in vagina" as I felt a bit like I had something in there, like a tampon or something (tmi sorry!). Does anyone else feel like that? Apparently it's the centre bit of the front pelvic bone. Don't know why I'm suddenly aware of it so will ring doctor tomorrow. Very odd. Having a bit of a minor panic right now.