R+L=J is the foundational fan theory of the 'A Song of Ice and Fire' book series and the 'Game of Thrones' TV show, positing that Jon Snow is the son of Rhaegar Targaryen and Lyanna Stark rather than the bastard son of Ned Stark. For decades, fans used textual clues to support this claim until it was officially confirmed in the show's later seasons. In meme culture, the equation 'R+L=J' is used both literally to celebrate the reveal and figuratively to mock overly complex fan theories or to present any 'obvious' secret revelation. It remains a staple of the fantasy community, symbolizing the payoff of years of collective speculation.