This Ruby style guide is based on https://github.com/chneukirchen/styleguide/blob/master/RUBY-STYLE https://github.com/chneukirchen/styleguide/blob/master/RUBY-

This Ruby style guide is based on https://github.com/chneukirchen/styleguide/blob/master/RUBY-STYLE https://github.com/chneukirchen/styleguide/blob/master/RUBY-... , as stated in the introductory paragraph. That style guide also contains these conventions for one-letter variable names. Many others have forked this guide and made modifications according to their tastes.