== "run-control" == 

 While not historically precise, rc may also be expanded as "run control", because an rc file controls how a program runs. For instance, the editor Vim looks for and reads the contents of the .vimrc file to determine its initial configuration. In The Art Of Unix Programming, Eric S. Raymond consistently refers to rc files as "run-control" files. 

 And yet '.vimrc' is an rc in the sense of 'run command' since it literally is a sequence of Vim commands, similar to the .emacs file.