In the earlier translations "The Cleft Of Dimensions" was changed to "The N-Zone", presumably to avoid childish jokes around the word "Cleft" like how "Butz" was changed to "Bartz" (they thought we'd think it looks to much like "Butts" all though apparently it isn't pronounced that way).
But I wonder, did the translators actually have a meaning for the "N"? I personally think it could mean "Negative", but I don't know for sure...