"Oyster card" meaning in English

{
  "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"
    }
  ],
  "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"
        }
      ],
      "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_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"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A contactless smart card, introduced in 2003, used to pay for public transport in the Greater London area."
      ],
      "links": [
        [
          "contactless",
          "contactless"
        ],
        [
          "smart card",
          "smart card"
        ],
        [
          "public transport",
          "public transport"
        ],
        [
          "Greater London",
          "Greater London"
        ]
      ],
      "wikipedia": [
        "Oyster card"
      ]
    }
  ],
  "word": "Oyster card"
}