An acronym that is also one of the primary words in the definition. For example, GNU stands for "GNU's Not Unix." Wine means "Wine Is Not an Emulator." See recursion
in which the first letter of the first word represented by the acronym is the acronym itself.
GNU is a recursive acronym for "GNU's not UNIX"
"HURD" is a co-recursive acronym, standing for "HIRD of Unix-Replacing Daemons", where "HIRD" stands for "HURD of Interfaces Representing Depth".
Origin of recursive-acronym