The term 'Keatsian Subject' refers to the work of the English Romantic poet John Keats, who often wrote about themes such as beauty, love, and mortality. The three-letter acronym URN is an abbreviation for the Latin phrase 'Ubi Rosa Nutrix, ' which translates to 'Where the Rose Nurtures.' This phrase is often used to describe Keats' poetic style, which is characterized by its focus on the beauty of nature and its ability to nurture and sustain life.