"No 11" meaning in English

{
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
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          "name": "English entries with incorrect language header",
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          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Eleven",
          "orig": "en:Eleven",
          "parents": [
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            "Names",
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            "Lemmas"
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          "source": "w"
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      ],
      "examples": [
        {
          "text": "Coordinate term: No 10"
        },
        {
          "ref": "2022 October 4, “Truss government in chaos amid budget confusion and coup accusations”, in The Guardian:",
          "text": "Government sources, however, continued to brief that No 10 and No 11 were considering bringing the date forward.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of 11 Downing Street."
      ],
      "id": "en-No_11-en-name-J52YlREg",
      "links": [
        [
          "11 Downing Street",
          "11 Downing Street#English"
        ]
      ],
      "raw_glosses": [
        "(UK politics) Synonym of 11 Downing Street."
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
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          "word": "11 Downing Street"
        },
        {
          "word": "No. 11"
        }
      ],
      "tags": [
        "UK"
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      "topics": [
        "government",
        "politics"
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  "word": "No 11"
}

{
  "head_templates": [
    {
      "args": {
        "head": "No 11"
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      "expansion": "No 11",
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  "lang_code": "en",
  "pos": "name",
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        "en:Eleven",
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      "examples": [
        {
          "text": "Coordinate term: No 10"
        },
        {
          "ref": "2022 October 4, “Truss government in chaos amid budget confusion and coup accusations”, in The Guardian:",
          "text": "Government sources, however, continued to brief that No 10 and No 11 were considering bringing the date forward.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of 11 Downing Street."
      ],
      "links": [
        [
          "11 Downing Street",
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      "raw_glosses": [
        "(UK politics) Synonym of 11 Downing Street."
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          "word": "11 Downing Street"
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      "topics": [
        "government",
        "politics"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "No. 11"
    }
  ],
  "word": "No 11"
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: 'No. 11', originally 'No. 11'",
  "path": [
    "No 11"
  ],
  "section": "English",
  "subsection": "",
  "title": "No 11",
  "trace": ""
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: 'No 11', originally 'No 11'",
  "path": [
    "No 11"
  ],
  "section": "English",
  "subsection": "proper noun",
  "title": "No 11",
  "trace": ""
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: 'No 11', originally 'No 11'",
  "path": [
    "No 11"
  ],
  "section": "English",
  "subsection": "proper noun",
  "title": "No 11",
  "trace": ""
}