RG is commonly used as an acronym for "Reference Guide". Synonyms for this term include "manual", "guidebook", "handbook", "reference book", and "instructional text". These words all refer to publications that provide information on a certain topic. Another possible synonym for the term "RG" is "recommendation". This term may be used in the context of a reference letter, where a person recommends another based on their qualifications and experience. A list of skills or experiences that qualify a person to be recommended may also be called an "RG". In general, the term "RG" is used to refer to any type of document that provides information or guidance on a specific subject.