ActiveSupport::Inflector::Inflections

@kdironside Rails tries to do inflections for you, but doesn't know every irregularity.

Specifies a new acronym. An acronym must be specified as it will appear in a camelized string. An underscore string that contains the acronym will retain the acronym when passed to `camelize`, `humanize`, or `titleize`. A camelized string that contains the acronym will maintain the acronym when titleized or humanized, and will convert the acronym into a non-delimited single lowercase word when passed to

Full article: http://api.rubyonrails.org/classes/ActiveSupport/Inflecto...