"Oyster card" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "the world is one's oyster"
      },
      "expansion": "the world is one's oyster",
      "name": "m"
    }
  ],
  "etymology_text": "Marketing coinage; influences are said to include the security and value of the oyster's shell and pearl, the oyster beds of London's Thames estuary, and the popular idiom the world is one's oyster.",
  "forms": [
    {
      "form": "Oyster cards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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        "head": "Oyster card"
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      "expansion": "Oyster card (plural Oyster cards)",
      "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",
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          "source": "w"
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      ],
      "glosses": [
        "A contactless smart card, introduced in 2003, used to pay for public transport in the Greater London area."
      ],
      "id": "en-Oyster_card-en-noun-4vF-3mpv",
      "links": [
        [
          "contactless",
          "contactless"
        ],
        [
          "smart card",
          "smart card"
        ],
        [
          "public transport",
          "public transport"
        ],
        [
          "Greater London",
          "Greater London"
        ]
      ],
      "wikipedia": [
        "Oyster card"
      ]
    }
  ],
  "word": "Oyster card"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "the world is one's oyster"
      },
      "expansion": "the world is one's oyster",
      "name": "m"
    }
  ],
  "etymology_text": "Marketing coinage; influences are said to include the security and value of the oyster's shell and pearl, the oyster beds of London's Thames estuary, and the popular idiom the world is one's oyster.",
  "forms": [
    {
      "form": "Oyster cards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Oyster card"
      },
      "expansion": "Oyster card (plural Oyster cards)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A contactless smart card, introduced in 2003, used to pay for public transport in the Greater London area."
      ],
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        [
          "contactless",
          "contactless"
        ],
        [
          "smart card",
          "smart card"
        ],
        [
          "public transport",
          "public transport"
        ],
        [
          "Greater London",
          "Greater London"
        ]
      ],
      "wikipedia": [
        "Oyster card"
      ]
    }
  ],
  "word": "Oyster card"
}