"question mark" meaning in English

{
  "forms": [
    {
      "form": "question mark",
      "source": "header"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Σημεία στίξης (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "ερωτηματικό"
      ],
      "id": "el-question_mark-en-noun-g0eD9~9D",
      "raw_tags": [
        "σημείο στίξης"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Πληροφορική (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The question mark (?) wildcard matches exactly one character."
        }
      ],
      "glosses": [
        "βλ. το σύμβολο: ?"
      ],
      "id": "el-question_mark-en-noun-OXU9BCBS",
      "raw_tags": [
        "πληροφορική"
      ]
    }
  ],
  "word": "question mark"
}

{
  "forms": [
    {
      "form": "question mark",
      "source": "header"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Σημεία στίξης (αγγλικά)"
      ],
      "glosses": [
        "ερωτηματικό"
      ],
      "raw_tags": [
        "σημείο στίξης"
      ]
    },
    {
      "categories": [
        "Πληροφορική (αγγλικά)"
      ],
      "examples": [
        {
          "text": "The question mark (?) wildcard matches exactly one character."
        }
      ],
      "glosses": [
        "βλ. το σύμβολο: ?"
      ],
      "raw_tags": [
        "πληροφορική"
      ]
    }
  ],
  "word": "question mark"
}