In my home folder in Linux I have several config files that have \"rc\" as a file name extension:
$ ls -a ~/|pcregrep \'rc$\'
.bashrc
.octaverc
.perltidyrc
.
It looks like one of the following:
Also I've found a citation:
The ‘rc’ suffix goes back to Unix's grandparent, CTSS. It had a command-script feature called "runcom". Early Unixes used ‘rc’ for the name of the operating system's boot script, as a tribute to CTSS runcom.