"Smith chart" meaning in English

{
  "etymology_text": "Invented by Phillip H. Smith (1905–1987).",
  "forms": [
    {
      "form": "Smith charts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Smith chart (plural Smith charts)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Engineering",
          "orig": "en:Engineering",
          "parents": [
            "Applied sciences",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A nomogram displaying impedances, admittances, etc., used by engineers to assist in solving problems with transmission lines and matching circuits."
      ],
      "id": "en-Smith_chart-en-noun-W1~0vlRj",
      "links": [
        [
          "nomogram",
          "nomogram"
        ],
        [
          "impedance",
          "impedance"
        ],
        [
          "admittance",
          "admittance"
        ],
        [
          "engineer",
          "engineer"
        ]
      ],
      "wikipedia": [
        "Smith chart"
      ]
    }
  ],
  "word": "Smith chart"
}

{
  "etymology_text": "Invented by Phillip H. Smith (1905–1987).",
  "forms": [
    {
      "form": "Smith charts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Smith chart (plural Smith charts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Engineering"
      ],
      "glosses": [
        "A nomogram displaying impedances, admittances, etc., used by engineers to assist in solving problems with transmission lines and matching circuits."
      ],
      "links": [
        [
          "nomogram",
          "nomogram"
        ],
        [
          "impedance",
          "impedance"
        ],
        [
          "admittance",
          "admittance"
        ],
        [
          "engineer",
          "engineer"
        ]
      ],
      "wikipedia": [
        "Smith chart"
      ]
    }
  ],
  "word": "Smith chart"
}