"LBB" meaning in Swedish

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "LBB",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "a rural letter carrier",
          "word": "lantbrevbärare"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sv",
          "name": "Post",
          "orig": "sv:Post",
          "parents": [
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of lantbrevbärare (“a rural letter carrier”)."
      ],
      "id": "en-LBB-sv-noun-wxsx1aZT",
      "links": [
        [
          "lantbrevbärare",
          "lantbrevbärare#Swedish"
        ]
      ],
      "synonyms": [
        {
          "word": "lbb"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "LBB"
}

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "LBB",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "a rural letter carrier",
          "word": "lantbrevbärare"
        }
      ],
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Swedish abbreviations",
        "Swedish entries with incorrect language header",
        "Swedish lemmas",
        "Swedish nouns",
        "sv:Post"
      ],
      "glosses": [
        "Abbreviation of lantbrevbärare (“a rural letter carrier”)."
      ],
      "links": [
        [
          "lantbrevbärare",
          "lantbrevbärare#Swedish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "lbb"
    }
  ],
  "word": "LBB"
}