"exit ticket" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "exit",
        "3": "ticket"
      },
      "expansion": "exit + ticket",
      "name": "com"
    }
  ],
  "etymology_text": "exit + ticket, because of it being one's \"ticket\" to exit the classroom.",
  "forms": [
    {
      "form": "exit tickets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "exit ticket (plural exit tickets)",
      "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": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A small assignment done at the end of a class period, often based on the subject taught that period."
      ],
      "id": "en-exit_ticket-en-noun-CLM8CKC9",
      "links": [
        [
          "assignment",
          "assignment"
        ],
        [
          "class",
          "class"
        ],
        [
          "period",
          "period"
        ]
      ]
    }
  ],
  "word": "exit ticket"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "exit",
        "3": "ticket"
      },
      "expansion": "exit + ticket",
      "name": "com"
    }
  ],
  "etymology_text": "exit + ticket, because of it being one's \"ticket\" to exit the classroom.",
  "forms": [
    {
      "form": "exit tickets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "exit ticket (plural exit tickets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Education"
      ],
      "glosses": [
        "A small assignment done at the end of a class period, often based on the subject taught that period."
      ],
      "links": [
        [
          "assignment",
          "assignment"
        ],
        [
          "class",
          "class"
        ],
        [
          "period",
          "period"
        ]
      ]
    }
  ],
  "word": "exit ticket"
}