"LCCN" meaning in English

{
  "forms": [
    {
      "form": "LCCNs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "LCCN (plural LCCNs)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Library of Congress Control Number"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Library of Congress Control Number."
      ],
      "id": "en-LCCN-en-noun-FzSPP9L6",
      "links": [
        [
          "Library of Congress Control Number",
          "w:Library of Congress Control Number"
        ]
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      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "LCCN"
}

{
  "forms": [
    {
      "form": "LCCNs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "LCCN (plural LCCNs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Library of Congress Control Number"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English links with redundant alt parameters",
        "English links with redundant wikilinks",
        "English nouns",
        "English words without vowels"
      ],
      "glosses": [
        "Initialism of Library of Congress Control Number."
      ],
      "links": [
        [
          "Library of Congress Control Number",
          "w:Library of Congress Control Number"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
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      ]
    }
  ],
  "word": "LCCN"
}