"~" 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"
    }
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales des mathématiques",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Approximativement."
      ],
      "id": "fr-~-conv-symbol-KhP8YBHI",
      "topics": [
        "mathematics"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la linguistique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Peut se varier avec."
      ],
      "id": "fr-~-conv-symbol-6KNeVk-c",
      "topics": [
        "linguistic"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de la lexicographie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Remplace le mot vedette."
      ],
      "id": "fr-~-conv-symbol-bqAp6WkR",
      "topics": [
        "lexicography"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en conventions internationales de l’informatique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Répertoire personnel sur un système d’exploitation de type Unix."
      ],
      "id": "fr-~-conv-symbol-FeDi0U6r",
      "topics": [
        "computing"
      ]
    }
  ],
  "word": "~"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "categories": [
        "Lexique en conventions internationales des mathématiques"
      ],
      "glosses": [
        "Approximativement."
      ],
      "topics": [
        "mathematics"
      ]
    },
    {
      "categories": [
        "Lexique en conventions internationales de la linguistique"
      ],
      "glosses": [
        "Peut se varier avec."
      ],
      "topics": [
        "linguistic"
      ]
    },
    {
      "categories": [
        "Lexique en conventions internationales de la lexicographie"
      ],
      "glosses": [
        "Remplace le mot vedette."
      ],
      "topics": [
        "lexicography"
      ]
    },
    {
      "categories": [
        "Lexique en conventions internationales de l’informatique"
      ],
      "glosses": [
        "Répertoire personnel sur un système d’exploitation de type Unix."
      ],
      "topics": [
        "computing"
      ]
    }
  ],
  "word": "~"
}