"常用對數" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 名詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 国際音声記号あり",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "じょうようたいすう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "日本語 指数・対数",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "日本語_旧字体表記",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "常用対数"
        }
      ],
      "glosses": [
        "常用対数の旧字体表記。。"
      ],
      "id": "ja-常用對數-ja-noun-iCxdUZKk",
      "raw_tags": [
        "指数・対数"
      ]
    }
  ],
  "sounds": [
    {
      "form": "じょーよーたいすう",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[jòóyóótáísúꜜù]",
      "tags": [
        "Nakadaka"
      ]
    },
    {
      "ipa": "[d͡ʑo̞ːjo̞ːta̠isɨᵝː]"
    }
  ],
  "word": "常用對數"
}

{
  "categories": [
    "日本語",
    "日本語 名詞",
    "日本語 国際音声記号あり"
  ],
  "forms": [
    {
      "form": "じょうようたいすう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "categories": [
        "日本語 指数・対数",
        "日本語_旧字体表記"
      ],
      "form_of": [
        {
          "word": "常用対数"
        }
      ],
      "glosses": [
        "常用対数の旧字体表記。。"
      ],
      "raw_tags": [
        "指数・対数"
      ]
    }
  ],
  "sounds": [
    {
      "form": "じょーよーたいすう",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[jòóyóótáísúꜜù]",
      "tags": [
        "Nakadaka"
      ]
    },
    {
      "ipa": "[d͡ʑo̞ːjo̞ːta̠isɨᵝː]"
    }
  ],
  "word": "常用對數"
}