"dấu nặng" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "dấu",
        "3": "nặng",
        "t1": "diacritic"
      },
      "expansion": "dấu (“diacritic”) + nặng",
      "name": "compound"
    }
  ],
  "etymology_text": "dấu (“diacritic”) + nặng (from the fact that the word nặng has the tone written with a dot below)",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "dấu nặng",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "dấu nặng",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Typography",
          "orig": "vi:Typography",
          "parents": [
            "Printing",
            "Writing",
            "Industries",
            "Human behaviour",
            "Language",
            "Business",
            "Human",
            "Communication",
            "Economics",
            "Society",
            "All topics",
            "Social sciences",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        },
        {
          "_dis": "70 30",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "73 27",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "81 19",
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "dot below, diacritic used to write the nặng tone in Vietnamese orthography"
      ],
      "id": "en-dấu_nặng-vi-noun-y6uIhvZu",
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "dot",
          "dot"
        ]
      ],
      "raw_glosses": [
        "(typography) dot below, diacritic used to write the nặng tone in Vietnamese orthography"
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Linguistics",
          "orig": "vi:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "nặng tone, low glottalized tone"
      ],
      "id": "en-dấu_nặng-vi-noun-7rXX436p",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "tone",
          "tone"
        ]
      ],
      "raw_glosses": [
        "(linguistics) nặng tone, low glottalized tone"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[zəw˧˦ naŋ˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[jəw˨˩˦ naŋ˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[jəw˦˥ naŋ˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "dấu nặng"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Vietnamese compound terms",
    "Vietnamese entries with incorrect language header",
    "Vietnamese lemmas",
    "Vietnamese nouns",
    "Vietnamese terms with IPA pronunciation"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "dấu",
        "3": "nặng",
        "t1": "diacritic"
      },
      "expansion": "dấu (“diacritic”) + nặng",
      "name": "compound"
    }
  ],
  "etymology_text": "dấu (“diacritic”) + nặng (from the fact that the word nặng has the tone written with a dot below)",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "dấu nặng",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "dấu nặng",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "vi:Typography"
      ],
      "glosses": [
        "dot below, diacritic used to write the nặng tone in Vietnamese orthography"
      ],
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "dot",
          "dot"
        ]
      ],
      "raw_glosses": [
        "(typography) dot below, diacritic used to write the nặng tone in Vietnamese orthography"
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    },
    {
      "categories": [
        "vi:Linguistics"
      ],
      "glosses": [
        "nặng tone, low glottalized tone"
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "tone",
          "tone"
        ]
      ],
      "raw_glosses": [
        "(linguistics) nặng tone, low glottalized tone"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[zəw˧˦ naŋ˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[jəw˨˩˦ naŋ˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[jəw˦˥ naŋ˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "dấu nặng"
}