E0: Read "Earth Origin". Home base. Society as we know it. The title "Earth Origin" is not a permanent title, but is used to refer to the base point from which any traveler originated. E0, in this case, refers to the groups starting point. The Permanent Parallel Index Reference Number to E0 is HSTBEaDisc11010227130832, but even Hunter doesn't know that off the top of her head.