For anything regarding renaming. Could be applicable to a wide range of subjects. Should be replaced by a more domain-specific tag if applicable.
Questions regarding renaming one or many files, directories, projects, variables, users, data cells, and version control conflicts arising from renaming should be tagged with rename.
To rename a file means to give an existing file a new name without changing any of its content. In UNIX systems, this is done with the mv command.
Renaming a variable will usually require a find-and-replace edit in existing code.