"marking pen" meaning in English

{
  "forms": [
    {
      "form": "marking pens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "marking pen (plural marking pens)",
      "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"
        }
      ],
      "examples": [
        {
          "text": "1977-1980, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure\nFalces came in with a marking pen & tape measure & drew on me where my nipples are in relation to my collarbone."
        }
      ],
      "glosses": [
        "A marker pen."
      ],
      "id": "en-marking_pen-en-noun-y2YuGOri",
      "links": [
        [
          "marker pen",
          "marker pen"
        ]
      ]
    }
  ],
  "word": "marking pen"
}

{
  "forms": [
    {
      "form": "marking pens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "marking pen (plural marking pens)",
      "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"
      ],
      "examples": [
        {
          "text": "1977-1980, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure\nFalces came in with a marking pen & tape measure & drew on me where my nipples are in relation to my collarbone."
        }
      ],
      "glosses": [
        "A marker pen."
      ],
      "links": [
        [
          "marker pen",
          "marker pen"
        ]
      ]
    }
  ],
  "word": "marking pen"
}