One of the plot devices used in Rick and Morty is the concept of an infinite number of alternate (i.e. parallel) universes. The characters in the show seem to use some sort of multi-universal indexing system to assign codes to these alternate universes.
Can such a system exist? Wouldn't it would have to be relative to one's own universe, thus making it incapable for this system to be universe-agnostic? Is this actually possible, or just one of the lovable absurdities of the show?