"Wratten number" meaning in English

{
  "etymology_text": "Named after Frederick Wratten, British inventor who founded the first photography company.",
  "forms": [
    {
      "form": "Wratten numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Wratten number (plural Wratten numbers)",
      "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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of the arbitrary alphanumeric codes in a system for labelling optical filters, usually for photographic use."
      ],
      "id": "en-Wratten_number-en-noun-m0FUh4l6",
      "links": [
        [
          "arbitrary",
          "arbitrary"
        ],
        [
          "alphanumeric",
          "alphanumeric"
        ],
        [
          "code",
          "code"
        ],
        [
          "system",
          "system"
        ],
        [
          "optical",
          "optical"
        ],
        [
          "filter",
          "filter"
        ],
        [
          "photographic",
          "photographic"
        ]
      ],
      "wikipedia": [
        "Wratten number"
      ]
    }
  ],
  "word": "Wratten number"
}

{
  "etymology_text": "Named after Frederick Wratten, British inventor who founded the first photography company.",
  "forms": [
    {
      "form": "Wratten numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Wratten number (plural Wratten numbers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "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"
      ],
      "glosses": [
        "Any of the arbitrary alphanumeric codes in a system for labelling optical filters, usually for photographic use."
      ],
      "links": [
        [
          "arbitrary",
          "arbitrary"
        ],
        [
          "alphanumeric",
          "alphanumeric"
        ],
        [
          "code",
          "code"
        ],
        [
          "system",
          "system"
        ],
        [
          "optical",
          "optical"
        ],
        [
          "filter",
          "filter"
        ],
        [
          "photographic",
          "photographic"
        ]
      ],
      "wikipedia": [
        "Wratten number"
      ]
    }
  ],
  "word": "Wratten number"
}