"BE" meaning in Conventions internationales

{
  "categories": [
    {
      "kind": "other",
      "name": "Symboles en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Conventions internationales",
      "orig": "conventions internationales",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la géographie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Code ISO 3166-1 (alpha-2) de la Belgique."
      ],
      "id": "fr-BE-conv-symbol-PbiyUn~r",
      "topics": [
        "geography"
      ]
    },
    {
      "glosses": [
        "Norme ISO 3166-2 du canton de Berne."
      ],
      "id": "fr-BE-conv-symbol-JPfBAcqH",
      "raw_tags": [
        "Suisse"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de l’aéronautique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Code AITA de la compagnie aérienne Flybe (British European)."
      ],
      "id": "fr-BE-conv-symbol-s-E62-74",
      "topics": [
        "aeronautics"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "BE"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        "Lexique en conventions internationales de la géographie"
      ],
      "glosses": [
        "Code ISO 3166-1 (alpha-2) de la Belgique."
      ],
      "topics": [
        "geography"
      ]
    },
    {
      "glosses": [
        "Norme ISO 3166-2 du canton de Berne."
      ],
      "raw_tags": [
        "Suisse"
      ]
    },
    {
      "categories": [
        "Lexique en conventions internationales de l’aéronautique"
      ],
      "glosses": [
        "Code AITA de la compagnie aérienne Flybe (British European)."
      ],
      "topics": [
        "aeronautics"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "BE"
}