"dr" 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": [
    "Par abréviation."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en conventions internationales",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en conventions internationales avec traduction désactivée",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la métrologie",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "1 dr av = 1,771 845 195 3125 g (exactement)"
        },
        {
          "text": "1 dr t = 3,887 9346 g (exactement)"
        },
        {
          "text": "1 fl dr (US) = 3,696 691 195 3125 mL (exactement)"
        },
        {
          "text": "1 fl dr (Imp) = 3,551 632 8125 mL (exactement)"
        }
      ],
      "glosses": [
        "Symbole du drachme (dram), unité de mesure de masse ou de volume anglo-saxonne."
      ],
      "id": "fr-dr-conv-symbol-j7d9Led7",
      "topics": [
        "metrology"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "dr"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "etymology_texts": [
    "Par abréviation."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        "Exemples en conventions internationales",
        "Exemples en conventions internationales avec traduction désactivée",
        "Lexique en conventions internationales de la métrologie"
      ],
      "examples": [
        {
          "text": "1 dr av = 1,771 845 195 3125 g (exactement)"
        },
        {
          "text": "1 dr t = 3,887 9346 g (exactement)"
        },
        {
          "text": "1 fl dr (US) = 3,696 691 195 3125 mL (exactement)"
        },
        {
          "text": "1 fl dr (Imp) = 3,551 632 8125 mL (exactement)"
        }
      ],
      "glosses": [
        "Symbole du drachme (dram), unité de mesure de masse ou de volume anglo-saxonne."
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "dr"
}