Scully: On the old mariner maps, the cartographers would designate unexplored territories by simply writing "Here Be Monsters". Mulder: I've seen the same thing on maps of New York City. — The X-Files, "Quagmire"
"Nine is a significant number in Norse magical practice (there were, for example, nine realms of existence), thereby learning nine (later eighteen) magical songs and eighteen magical runes.