"signe dur" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "ru",
        "3": "твёрдый знак"
      },
      "expansion": "Calque of Russian твёрдый знак (tvjórdyj znak)",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Russian твёрдый знак (tvjórdyj znak).",
  "forms": [
    {
      "form": "signes durs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "signe dur m (plural signes durs)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Phonetics",
          "orig": "fr:Phonetics",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Typography",
          "orig": "fr:Typography",
          "parents": [
            "Printing",
            "Writing",
            "Industries",
            "Human behaviour",
            "Language",
            "Business",
            "Human",
            "Communication",
            "Economics",
            "Society",
            "All topics",
            "Social sciences",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "hard sign"
      ],
      "id": "en-signe_dur-fr-noun-rJCxV22d",
      "links": [
        [
          "phonetics",
          "phonetics"
        ],
        [
          "typography",
          "typography"
        ],
        [
          "hard sign",
          "hard sign"
        ]
      ],
      "raw_glosses": [
        "(phonetics, typography) hard sign"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "media",
        "phonetics",
        "phonology",
        "publishing",
        "sciences",
        "typography"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/siɲ dyʁ/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-signe dur.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1a/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1a/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav.ogg",
      "text": "Audio"
    }
  ],
  "word": "signe dur"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "ru",
        "3": "твёрдый знак"
      },
      "expansion": "Calque of Russian твёрдый знак (tvjórdyj znak)",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Russian твёрдый знак (tvjórdyj znak).",
  "forms": [
    {
      "form": "signes durs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "signe dur m (plural signes durs)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms calqued from Russian",
        "French terms derived from Russian",
        "French terms with IPA pronunciation",
        "French terms with audio links",
        "fr:Phonetics",
        "fr:Typography"
      ],
      "glosses": [
        "hard sign"
      ],
      "links": [
        [
          "phonetics",
          "phonetics"
        ],
        [
          "typography",
          "typography"
        ],
        [
          "hard sign",
          "hard sign"
        ]
      ],
      "raw_glosses": [
        "(phonetics, typography) hard sign"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "media",
        "phonetics",
        "phonology",
        "publishing",
        "sciences",
        "typography"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/siɲ dyʁ/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-signe dur.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1a/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1a/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav/LL-Q150_%28fra%29-WikiLucas00-signe_dur.wav.ogg",
      "text": "Audio"
    }
  ],
  "word": "signe dur"
}