"SU" 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"
    }
  ],
  "etymology_texts": [
    "(Automobile) (1956) De l’anglais Soviet Union."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de l’automobile",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "URSS en conventions internationales",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Signe distinctif en trafic international des véhicules automobiles immatriculés en Union soviétique, prescrit dans le cadre de la Convention sur la circulation routière de Genève de 1949 et de la Convention sur la signalisation routière de Vienne de 1968."
      ],
      "id": "fr-SU-conv-symbol-e62DrmLO",
      "raw_tags": [
        "Communisme",
        "URSS"
      ],
      "topics": [
        "automobile",
        "history"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Termes désuets en conventions internationales",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "URSS en conventions internationales",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Code ISO 3166-1 alpha-2 de l’Union soviétique."
      ],
      "id": "fr-SU-conv-symbol-K4y5140j",
      "raw_tags": [
        "Communisme",
        "URSS",
        "1974–1992"
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "history"
      ]
    },
    {
      "glosses": [
        "Code de pays ISO 3166-1 alpha-2 réservé à titre exceptionnel de l’Union soviétique."
      ],
      "id": "fr-SU-conv-symbol-fsIkRdeY"
    }
  ],
  "synonyms": [
    {
      "raw_tags": [
        "ISO 4217"
      ],
      "sense": "Union Soviétique (pays)",
      "word": "SUN"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "SU"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "etymology_texts": [
    "(Automobile) (1956) De l’anglais Soviet Union."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        "Lexique en conventions internationales de l’automobile",
        "URSS en conventions internationales"
      ],
      "glosses": [
        "Signe distinctif en trafic international des véhicules automobiles immatriculés en Union soviétique, prescrit dans le cadre de la Convention sur la circulation routière de Genève de 1949 et de la Convention sur la signalisation routière de Vienne de 1968."
      ],
      "raw_tags": [
        "Communisme",
        "URSS"
      ],
      "topics": [
        "automobile",
        "history"
      ]
    },
    {
      "categories": [
        "Termes désuets en conventions internationales",
        "URSS en conventions internationales"
      ],
      "glosses": [
        "Code ISO 3166-1 alpha-2 de l’Union soviétique."
      ],
      "raw_tags": [
        "Communisme",
        "URSS",
        "1974–1992"
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "history"
      ]
    },
    {
      "glosses": [
        "Code de pays ISO 3166-1 alpha-2 réservé à titre exceptionnel de l’Union soviétique."
      ]
    }
  ],
  "synonyms": [
    {
      "raw_tags": [
        "ISO 4217"
      ],
      "sense": "Union Soviétique (pays)",
      "word": "SUN"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "SU"
}