Magic GUIDs
It is possible to create or alter globally unique identifiers (GUIDs) so that they are memorable, but this is highly discouraged as it compromises their strength as near-unique identifiers. The specifications for generating GUIDs and UUIDs are quite complex, which is what leads to them being guaranteed unique, if properly implemented. They should only be generated by a reputable software tool.
Java uses several GUIDs starting with CAFEEFAC.
In the GUID Partition Table of the GPT partitioning scheme, BIOS Boot partitions use the special GUID {21686148-6449-6E6F-744E-656564454649}, which does not follow the GUID definition; instead, it is formed by using the ASCII codes for the string "Hah!IdontNeedEFI".
Read more about this topic: Magic Number (programming)
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