"Cnc" meaning in Conventions internationales

{
  "categories": [
    {
      "kind": "other",
      "name": "Abréviations en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms scientifiques",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Conventions internationales",
      "orig": "conventions internationales",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Abréviation) (1922)  Abréviation du génitif latin Cancri. Cnc est utilisé pour la départager de celles des Chiens de chasse (Canes Venatici, CVn), et des Petit et Grand Chiens (Canis Minoris et Majoris, CMi et CMa, respectivement)."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "noun",
  "pos_title": "Nom scientifique",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Constellations en conventions internationales",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abréviation latine désignant la constellation du Cancer."
      ],
      "id": "fr-Cnc-conv-noun-sTYb5x6Y",
      "topics": [
        "astronomy"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "Cnc"
}

{
  "categories": [
    "Abréviations en conventions internationales",
    "Noms scientifiques",
    "conventions internationales"
  ],
  "etymology_texts": [
    "(Abréviation) (1922)  Abréviation du génitif latin Cancri. Cnc est utilisé pour la départager de celles des Chiens de chasse (Canes Venatici, CVn), et des Petit et Grand Chiens (Canis Minoris et Majoris, CMi et CMa, respectivement)."
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "noun",
  "pos_title": "Nom scientifique",
  "senses": [
    {
      "categories": [
        "Constellations en conventions internationales"
      ],
      "glosses": [
        "Abréviation latine désignant la constellation du Cancer."
      ],
      "topics": [
        "astronomy"
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "Cnc"
}