It's hard to say, because there realy haven't been an project names that were only numbers. The only one I can think of was Twister, which was "Project 911", an obvious meaning. The only other projects with numbers have appeared recently, 722 (Potter), 3.15AM/PM(Parade/Lagoon), and 37 (Team member parking expansion). If Potter is Gringotts, the 722 is an obvious refrence to the high security vaults, as the project is "high security/top secret" (kind of funny in hindsight...). And considering projects 3.15AM/PM aren't simply 315, i'd say there's a high chance at that project title having some sort of meaning as well...