"white spot" meaning in English

{
  "forms": [
    {
      "form": "white spots",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "white spot (plural white spots)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "83 17",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "86 14",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "originally a white spot on 19th century geographical maps, indicating lack of knowledge, from the German expression \"weißer Fleck auf der Landkarte\", also known as \"blank spot\""
      ],
      "id": "en-white_spot-en-noun-3td~VyFL"
    },
    {
      "examples": [
        {
          "text": "TMC coverage is smaller than that of the radio programme carrying the TMC service, therefore white spots do exist."
        }
      ],
      "glosses": [
        "a place without coverage"
      ],
      "id": "en-white_spot-en-noun-az9RIWVP",
      "qualifier": "telecoms",
      "raw_glosses": [
        "(telecoms) a place without coverage"
      ]
    }
  ],
  "word": "white spot"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "white spots",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "white spot (plural white spots)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "originally a white spot on 19th century geographical maps, indicating lack of knowledge, from the German expression \"weißer Fleck auf der Landkarte\", also known as \"blank spot\""
      ]
    },
    {
      "examples": [
        {
          "text": "TMC coverage is smaller than that of the radio programme carrying the TMC service, therefore white spots do exist."
        }
      ],
      "glosses": [
        "a place without coverage"
      ],
      "qualifier": "telecoms",
      "raw_glosses": [
        "(telecoms) a place without coverage"
      ]
    }
  ],
  "word": "white spot"
}