"B1" 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": [
    "Série B de la norme (il y a aussi A et C), suivi du nombre de fois qu’il faut couper en deux le format B0 pour arriver à ce format."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de l’imprimerie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Code ISO 216 du format de papier de 1000 mm × 707 mm."
      ],
      "id": "fr-B1-conv-symbol-rZXB7reW",
      "raw_tags": [
        "Imprimerie"
      ]
    }
  ],
  "word": "B1"
}

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Symboles en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Conventions internationales",
      "orig": "conventions internationales",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de B (« deux types d’atomes en proportions égales ») et de 1."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole 2",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la cristallographie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Matériau dot les cristaux ont la structure du chlorure de sodium (NaCl) dans la notation de Strukturbericht."
      ],
      "id": "fr-B1-conv-symbol-0C3dLF4h",
      "topics": [
        "crystallography"
      ]
    }
  ],
  "word": "B1"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "etymology_texts": [
    "Série B de la norme (il y a aussi A et C), suivi du nombre de fois qu’il faut couper en deux le format B0 pour arriver à ce format."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        "Lexique en conventions internationales de l’imprimerie"
      ],
      "glosses": [
        "Code ISO 216 du format de papier de 1000 mm × 707 mm."
      ],
      "raw_tags": [
        "Imprimerie"
      ]
    }
  ],
  "word": "B1"
}

{
  "categories": [
    "Compositions en conventions internationales",
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "etymology_texts": [
    "Composé de B (« deux types d’atomes en proportions égales ») et de 1."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole 2",
  "senses": [
    {
      "categories": [
        "Lexique en conventions internationales de la cristallographie"
      ],
      "glosses": [
        "Matériau dot les cristaux ont la structure du chlorure de sodium (NaCl) dans la notation de Strukturbericht."
      ],
      "topics": [
        "crystallography"
      ]
    }
  ],
  "word": "B1"
}