Registries allocate a breed number, acronym or a Code to the breeds they register. Most use a two or 3 letter acronym e.g. MK (Munchkin), JBT (Japanese Bobtail). This may be followed by numbers or lower case acronyms that indicate colour and pattern, these being subdivisions of the breed. For historical reasons, the British GCCF allocate numbers to breeds and the Black Persian Longhair is registered under a different breed number, and effectively as a different breed, to the Blue Persian Longhair. These lists may be found on individual registry websites (or in their printed publications where they do not yet have a website). All FIFe Member cat registries use the EMS (Easy Memory System) breed and variety code which consists of a breed abbreviation followed by pattern and colour letters and digits which are consistent across all breeds.