A catalog item is preceded by FRAGILE and a four digit number representing when it was inserted into the catalog. Numbers are assigned in order based on the first published edition of a catalog item. Catalog items can include EPs, LPs, 2xLPs, Mixtapes, Compilations, and Live Shows.
A catalog single is preceded by FRGL777- and a four digit number representing when it was inserted into the catalog. Numbers are assigned in order based on the first published edition of a catalog single. A catalog single may or may not have an associated catalog item.
Every catalog item and single will have at least one edition, and may have multiples of the same type of edition. The edition of a release is indicated by a single letter and a two-digit number. Different edition types increment their numbers independently (i.e., "D01" and "C01" may exist at the same time). Different editions do not have to contain the same audio files or tracklist, but every release under a single edition will be based on the same masters.
All editions which are not digital releases or merchandise (type D or M) are limited, individually numbered releases. Merchandise editions are limited, but not individually numbered, and may be restocked.