R in medicine represents more meanings, clinically more common is mainly used when the doctor prescribes or medical examination to distinguish between the left and right, vital signs in respiration will also use R. 1, the doctor prescribes: international usually used Preion Drug, referred to as R, refers to the practitioner in the diagnosis and treatment activities prescribed by the pharmacist review, deployment, verification, and as a medical document for the use of drug vouchers. 2, medical examination: clinically, when conducting X-ray examinations, eye examinations, or on the case records, usually use R for Right. Because Right means right side in English, take its initials to indicate; 3, respiration: vital signs include temperature, pulse, respiration and blood pressure, of which respiration is indicated by R, because Respiration, meaning breathing in English. The letters or Latin are often used in medicine because their structure no longer changes and the concepts expressed are more concise and precise. Moreover, writing prescriptions or records in this language and script facilitates the unification of concepts for medical practitioners at home and abroad, and obtains convenience for medical treatment and research.