"7/7" meaning in English

{
  "etymology_text": "The date 7 July (or July 7) in numbers, by analogy with 9/11.",
  "forms": [
    {
      "form": "7",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "7",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "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 reduplicated coordinated pairs",
          "parents": [
            "Reduplicated coordinated pairs",
            "Coordinated pairs",
            "Reduplications",
            "Terms by etymology"
          ],
          "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": "Historical events",
          "orig": "en:Historical events",
          "parents": [
            "History",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The terrorist bombings of London’s public transportation system on 7 July 2005."
      ],
      "id": "en-7/7-en-name-lV8fqpHV",
      "links": [
        [
          "terrorist",
          "terrorist"
        ],
        [
          "bombing",
          "bombing"
        ],
        [
          "public",
          "public"
        ],
        [
          "transportation",
          "transportation"
        ],
        [
          "system",
          "system"
        ]
      ],
      "wikipedia": [
        "7/7"
      ]
    }
  ],
  "sounds": [
    {
      "enpr": "sĕv'ən sĕvʹən"
    },
    {
      "ipa": "/ˌsɛvənˈsɛvən/"
    }
  ],
  "word": "7/7"
}

{
  "etymology_text": "The date 7 July (or July 7) in numbers, by analogy with 9/11.",
  "forms": [
    {
      "form": "7",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "7",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English proper nouns",
        "English reduplicated coordinated pairs",
        "English uncountable nouns",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Historical events"
      ],
      "glosses": [
        "The terrorist bombings of London’s public transportation system on 7 July 2005."
      ],
      "links": [
        [
          "terrorist",
          "terrorist"
        ],
        [
          "bombing",
          "bombing"
        ],
        [
          "public",
          "public"
        ],
        [
          "transportation",
          "transportation"
        ],
        [
          "system",
          "system"
        ]
      ],
      "wikipedia": [
        "7/7"
      ]
    }
  ],
  "sounds": [
    {
      "enpr": "sĕv'ən sĕvʹən"
    },
    {
      "ipa": "/ˌsɛvənˈsɛvən/"
    }
  ],
  "word": "7/7"
}