"unit matrix" meaning in All languages combined

{
  "forms": [
    {
      "form": "unit matrices",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "unit matrixes",
      "tags": [
        "plural"
      ]
    }
  ],
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      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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        {
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      ],
      "glosses": [
        "An identity matrix"
      ],
      "id": "en-unit_matrix-en-noun-mOfmT3zM",
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          "linear algebra",
          "linear algebra"
        ],
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          "identity matrix",
          "identity matrix"
        ]
      ],
      "raw_glosses": [
        "(linear algebra) An identity matrix"
      ],
      "topics": [
        "linear-algebra",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "unit matrix"
}

{
  "forms": [
    {
      "form": "unit matrices",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "unit matrixes",
      "tags": [
        "plural"
      ]
    }
  ],
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
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        "English lemmas",
        "English multiword terms",
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        "mathematics",
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  "word": "unit matrix"
}