"Whyte notation" meaning in English

{
  "etymology_text": "Devised by Frederick Methvan Whyte; came into use at the start of the 20th century.",
  "head_templates": [
    {
      "args": {
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      "expansion": "Whyte notation (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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      "glosses": [
        "A notation for classifying steam locomotives by their wheel arrangement. For example, a locomotive with two leading axles (four wheels) in front, then three driving axles (six wheels) and then one trailing axle (two wheels) is denoted 4-6-2."
      ],
      "id": "en-Whyte_notation-en-noun-T79IB4NA",
      "links": [
        [
          "classify",
          "classify"
        ],
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "wheel",
          "wheel"
        ],
        [
          "arrangement",
          "arrangement"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Whyte notation"
      ]
    }
  ],
  "word": "Whyte notation"
}

{
  "etymology_text": "Devised by Frederick Methvan Whyte; came into use at the start of the 20th century.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "Whyte notation (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns"
      ],
      "glosses": [
        "A notation for classifying steam locomotives by their wheel arrangement. For example, a locomotive with two leading axles (four wheels) in front, then three driving axles (six wheels) and then one trailing axle (two wheels) is denoted 4-6-2."
      ],
      "links": [
        [
          "classify",
          "classify"
        ],
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "wheel",
          "wheel"
        ],
        [
          "arrangement",
          "arrangement"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Whyte notation"
      ]
    }
  ],
  "word": "Whyte notation"
}