"R+L=J" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "A Song of Ice and Fire",
          "orig": "en:A Song of Ice and Fire",
          "parents": [
            "American fiction",
            "Fantasy",
            "Literature",
            "Fiction",
            "United States",
            "Speculative fiction",
            "Culture",
            "Entertainment",
            "Writing",
            "Artistic works",
            "North America",
            "Genres",
            "Society",
            "Human behaviour",
            "Language",
            "Art",
            "America",
            "All topics",
            "Human",
            "Communication",
            "Earth",
            "Fundamental",
            "Nature"
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Family",
          "orig": "en:Family",
          "parents": [
            "People",
            "Human",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Fictional characters",
          "orig": "en:Fictional characters",
          "parents": [
            "Fiction",
            "Artistic works",
            "Art",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015, Andrew Howe, \"The Hand of the Artist: Fan Art in the Martinverse\", in Mastering the Game of Thrones: Essays on George R.R. Martin's A Song of Ice and Fire (eds. Jes Battis & Susan Johnston), page 250",
          "text": "This is particularly true of the “R+L=J” phenomenon, the theory that Jon Snow is actually the son of Rhaegar Targaryen and Lyanna Stark, which is commonplace on “Westeros.org,” “Tower of the Hand,” and other sites of online fandom."
        },
        {
          "ref": "2015 March, Ford Maddox Brown, “The Hand of the King”, in Starburst Magazine, page 21",
          "text": "R+L=J: This is a heavily supported theory that has been referenced in the books.",
          "type": "quotation"
        },
        {
          "ref": "2017, Rowan Kaiser, 100 Things Game of Thrones Fans Should Know & Do Before They Die, page 102",
          "text": "Still, this evidence was strong enough that R+L=J was the default theory for most readers, to the point where some believed that the strongest evidence against it was that it was too obvious."
        }
      ],
      "glosses": [
        "The theory that the character Jon Snow, initially presented in A Song of Ice and Fire/Game of Thrones as the bastard son of Ned Stark by an unknown woman, is actually a secret child born of the union of Rhaegar Targaryen and Lyanna Stark."
      ],
      "id": "en-R+L=J-en-name-Uxdz2dPW",
      "links": [
        [
          "fandom",
          "fandom"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "theory",
          "theory"
        ],
        [
          "bastard",
          "bastard"
        ],
        [
          "son",
          "son"
        ],
        [
          "secret",
          "secret"
        ],
        [
          "child",
          "child"
        ],
        [
          "union",
          "union"
        ]
      ],
      "raw_glosses": [
        "(fandom slang) The theory that the character Jon Snow, initially presented in A Song of Ice and Fire/Game of Thrones as the bastard son of Ned Stark by an unknown woman, is actually a secret child born of the union of Rhaegar Targaryen and Lyanna Stark."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "lifestyle"
      ]
    }
  ],
  "word": "R+L=J"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English eponyms",
        "English fandom slang",
        "English lemmas",
        "English proper nouns",
        "English terms spelled with +",
        "English terms spelled with =",
        "English terms with quotations",
        "English uncountable nouns",
        "English words without vowels",
        "en:A Song of Ice and Fire",
        "en:Family",
        "en:Fictional characters"
      ],
      "examples": [
        {
          "ref": "2015, Andrew Howe, \"The Hand of the Artist: Fan Art in the Martinverse\", in Mastering the Game of Thrones: Essays on George R.R. Martin's A Song of Ice and Fire (eds. Jes Battis & Susan Johnston), page 250",
          "text": "This is particularly true of the “R+L=J” phenomenon, the theory that Jon Snow is actually the son of Rhaegar Targaryen and Lyanna Stark, which is commonplace on “Westeros.org,” “Tower of the Hand,” and other sites of online fandom."
        },
        {
          "ref": "2015 March, Ford Maddox Brown, “The Hand of the King”, in Starburst Magazine, page 21",
          "text": "R+L=J: This is a heavily supported theory that has been referenced in the books.",
          "type": "quotation"
        },
        {
          "ref": "2017, Rowan Kaiser, 100 Things Game of Thrones Fans Should Know & Do Before They Die, page 102",
          "text": "Still, this evidence was strong enough that R+L=J was the default theory for most readers, to the point where some believed that the strongest evidence against it was that it was too obvious."
        }
      ],
      "glosses": [
        "The theory that the character Jon Snow, initially presented in A Song of Ice and Fire/Game of Thrones as the bastard son of Ned Stark by an unknown woman, is actually a secret child born of the union of Rhaegar Targaryen and Lyanna Stark."
      ],
      "links": [
        [
          "fandom",
          "fandom"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "theory",
          "theory"
        ],
        [
          "bastard",
          "bastard"
        ],
        [
          "son",
          "son"
        ],
        [
          "secret",
          "secret"
        ],
        [
          "child",
          "child"
        ],
        [
          "union",
          "union"
        ]
      ],
      "raw_glosses": [
        "(fandom slang) The theory that the character Jon Snow, initially presented in A Song of Ice and Fire/Game of Thrones as the bastard son of Ned Stark by an unknown woman, is actually a secret child born of the union of Rhaegar Targaryen and Lyanna Stark."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "lifestyle"
      ]
    }
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  "word": "R+L=J"
}