"бб" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "bb",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "бб (Latin spelling bb)",
      "name": "sh-adj"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "without a number",
          "word": "без броја"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Војни музеј\nКалемегдан бб\n11000, Београд\nСрбија",
          "type": "example"
        }
      ],
      "glosses": [
        "Abbreviation of без броја (without a number)"
      ],
      "id": "en-бб-sh-adj-QrwQ5nT3",
      "links": [
        [
          "без броја",
          "без броја#Serbo-Croatian"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "бб"
}

{
  "forms": [
    {
      "form": "bb",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "бб (Latin spelling bb)",
      "name": "sh-adj"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "without a number",
          "word": "без броја"
        }
      ],
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for translations of Serbo-Croatian usage examples",
        "Serbo-Croatian adjectives",
        "Serbo-Croatian entries with incorrect language header",
        "Serbo-Croatian lemmas",
        "Serbo-Croatian terms with redundant script codes",
        "Serbo-Croatian terms with usage examples"
      ],
      "examples": [
        {
          "text": "Војни музеј\nКалемегдан бб\n11000, Београд\nСрбија",
          "type": "example"
        }
      ],
      "glosses": [
        "Abbreviation of без броја (without a number)"
      ],
      "links": [
        [
          "без броја",
          "без броја#Serbo-Croatian"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "бб"
}