"ẩn số" meaning in Vietnamese

{
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        "2": "Sino-Vietnamese words"
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      "expansion": "",
      "name": "categorize"
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    {
      "args": {
        "1": "隱",
        "2": "to hide",
        "3": "數",
        "4": "number"
      },
      "expansion": "Sino-Vietnamese word from 隱 (“to hide”) and 數 (“number”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 隱 (“to hide”) and 數 (“number”)",
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      "expansion": "ẩn số",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "ẩn số",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Algebra",
          "orig": "vi:Algebra",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "72 28",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "79 21",
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          "_dis": "62 38",
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          "_dis": "85 15",
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        {
          "_dis": "83 17",
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          "parents": [
            "Entries with incorrect language header",
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      ],
      "glosses": [
        "an unknown"
      ],
      "id": "en-ẩn_số-vi-noun-XF38LUYh",
      "links": [
        [
          "algebra",
          "algebra"
        ],
        [
          "unknown",
          "unknown#English"
        ]
      ],
      "raw_glosses": [
        "(algebra) an unknown"
      ],
      "synonyms": [
        {
          "word": "ẩn"
        }
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    },
    {
      "glosses": [
        "an unknown entity, a missing link, a mystery or an enigma"
      ],
      "id": "en-ẩn_số-vi-noun-uEWzWBDX",
      "links": [
        [
          "unknown",
          "unknown#English"
        ],
        [
          "entity",
          "entity#English"
        ],
        [
          "missing link",
          "missing link#English"
        ],
        [
          "mystery",
          "mystery#English"
        ],
        [
          "enigma",
          "enigma#English"
        ]
      ],
      "raw_glosses": [
        "(by extension) an unknown entity, a missing link, a mystery or an enigma"
      ],
      "tags": [
        "broadly"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔən˧˩ so˧˦]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔəŋ˧˨ ʂow˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔəŋ˧˨ sow˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔəŋ˨˩˦ ʂow˦˥]",
      "note": "Saigon"
    },
    {
      "ipa": "[ʔəŋ˨˩˦ sow˦˥]",
      "note": "Saigon"
    }
  ],
  "word": "ẩn số"
}

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    "Vietnamese nouns",
    "Vietnamese terms with IPA pronunciation"
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    {
      "args": {
        "1": "隱",
        "2": "to hide",
        "3": "數",
        "4": "number"
      },
      "expansion": "Sino-Vietnamese word from 隱 (“to hide”) and 數 (“number”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 隱 (“to hide”) and 數 (“number”)",
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      "expansion": "ẩn số",
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      "expansion": "ẩn số",
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  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "vi:Algebra"
      ],
      "glosses": [
        "an unknown"
      ],
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        [
          "algebra",
          "algebra"
        ],
        [
          "unknown",
          "unknown#English"
        ]
      ],
      "raw_glosses": [
        "(algebra) an unknown"
      ],
      "synonyms": [
        {
          "word": "ẩn"
        }
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    },
    {
      "glosses": [
        "an unknown entity, a missing link, a mystery or an enigma"
      ],
      "links": [
        [
          "unknown",
          "unknown#English"
        ],
        [
          "entity",
          "entity#English"
        ],
        [
          "missing link",
          "missing link#English"
        ],
        [
          "mystery",
          "mystery#English"
        ],
        [
          "enigma",
          "enigma#English"
        ]
      ],
      "raw_glosses": [
        "(by extension) an unknown entity, a missing link, a mystery or an enigma"
      ],
      "tags": [
        "broadly"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔən˧˩ so˧˦]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔəŋ˧˨ ʂow˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔəŋ˧˨ sow˨˩˦]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔəŋ˨˩˦ ʂow˦˥]",
      "note": "Saigon"
    },
    {
      "ipa": "[ʔəŋ˨˩˦ sow˦˥]",
      "note": "Saigon"
    }
  ],
  "word": "ẩn số"
}