I think theres a character in Shaman King with the nickname Iron Maiden. Iron Maidens are very scary. They got the name because the casket looks like a Maiden and it was made of Iron. therefor, the name was 'Iron Maiden'. I haven't seen the character yet because in the Shaman King Manga, I'm still right before the fight with Faust. Right when he opens up Manta.

PS: Yaoi cookies are bad. but thats in my opinion.