Super-close pals, for short

This crossword clue is for the definition: Super-close pals, for short.
it’s A 27 letters crossword puzzle definition.
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Possible Answers: BFFS.

Last seen on: USA Today Crossword – Oct 16 2020

Random information on the term “BFFS”:

The following tables compare general and technical information for a number of file systems.

In POSIX namespace: any UTF-16 code unit (case-sensitive) except / as well as NUL

Note that in addition to the below table, block capabilities can be implemented below the file system layer in Linux (LVM, integritysetup, cryptsetup) or Windows (Volume Shadow Copy Service, SECURITY), etc.

Experimental port available to 2.6.32 and later [80][81]

BFFS on Wikipedia