When interdimensional travellers first discovered the cluster of parallel dimensions, to which one dimension within is the setting of our story, it had been the 40,111,471th dimension cluster they had discovered so far and so the cluster was given the index '4011_1471'.
Within the cluster, each dimension was given a letter in the order of which they were discovered, for example the first dimension in the 4011_1471 cluster was given the name Dimension 4011_1471A, the second Dimension 4011