"Pl" meaning in Conventions internationales

{
  "categories": [
    {
      "kind": "other",
      "name": "Symboles désuets des éléments chimiques",
      "parents": [],
      "source": "w"
    },
    {
      "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": [
    {
      "alt_of": [
        {
          "word": "PL"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la métrologie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Variante de PL."
      ],
      "id": "fr-Pl-conv-symbol-HQJe-3JF",
      "tags": [
        "alt-of"
      ],
      "topics": [
        "metrology"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la métrologie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Symbole du poiseuille, nom proposé pour le pascal-seconde, l’unité de mesure de viscosité dynamique du Système international."
      ],
      "id": "fr-Pl-conv-symbol-BPQ3q4Dx",
      "topics": [
        "metrology"
      ]
    },
    {
      "glosses": [
        "Ancien symbole chimique du pélopium."
      ],
      "id": "fr-Pl-conv-symbol-JhqzITMO",
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Dans son premier tableau périodique, Mendeleïev utilise Pl comme symbole du palladium."
        }
      ],
      "glosses": [
        "Symbole chimique alternatif du palladium (Pd)."
      ],
      "id": "fr-Pl-conv-symbol-OMNq8p8l",
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "Pétalitre",
      "word": "PL"
    },
    {
      "sense": "Pétalitre",
      "word": "Pℓ"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "Pl"
}

{
  "categories": [
    "Symboles désuets des éléments chimiques",
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "alt_of": [
        {
          "word": "PL"
        }
      ],
      "categories": [
        "Lexique en conventions internationales de la métrologie"
      ],
      "glosses": [
        "Variante de PL."
      ],
      "tags": [
        "alt-of"
      ],
      "topics": [
        "metrology"
      ]
    },
    {
      "categories": [
        "Lexique en conventions internationales de la métrologie"
      ],
      "glosses": [
        "Symbole du poiseuille, nom proposé pour le pascal-seconde, l’unité de mesure de viscosité dynamique du Système international."
      ],
      "topics": [
        "metrology"
      ]
    },
    {
      "glosses": [
        "Ancien symbole chimique du pélopium."
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    },
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "text": "Dans son premier tableau périodique, Mendeleïev utilise Pl comme symbole du palladium."
        }
      ],
      "glosses": [
        "Symbole chimique alternatif du palladium (Pd)."
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "Pétalitre",
      "word": "PL"
    },
    {
      "sense": "Pétalitre",
      "word": "Pℓ"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "Pl"
}