"AAAB" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {},
      "expansion": "AAAB",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "American Association of Architectural Bibliographers"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with 3 consecutive instances of the same letter",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Organizations",
          "orig": "en:Organizations",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of American Association of Architectural Bibliographers."
      ],
      "id": "en-AAAB-en-name-GIXx1hpg",
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "AAAB"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "AAAB",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "American Association of Architectural Bibliographers"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English proper nouns",
        "English terms with 3 consecutive instances of the same letter",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Organizations"
      ],
      "glosses": [
        "Initialism of American Association of Architectural Bibliographers."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "AAAB"
}