Well, this is embarrassing. I feel like I just realised I don't know a loyal colleague's name after working with them for 10 years. "Hey, er... *cough!*, thanks for that great job you did on setting my aliases this morning..."
What do the letters
rc signify in
If you know, please cite sources.
Even if you don't know, I'd also welcome unfounded assumptions, suggestions or alternatives if they're marked as such.