User blog comment:Jasca Ducato/*Spoilers* Juno, Eagle Vision and all that. *Spoilers*/@comment-86.41.96.200-20101224140928/@comment-3568630-20110602003232

The symbol isn't by the pedestal; it's on the platform in front of the stairs (the one with the other pedestal). I was curious about it at first, but now I think it's a sort of map showing which switches to pull when going around the vault.