"fan marker" meaning in English

{
  "forms": [
    {
      "form": "fan markers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fan marker (plural fan markers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Aviation",
          "orig": "en:Aviation",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Navigation",
          "orig": "en:Navigation",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "inner marker"
        },
        {
          "word": "middle marker"
        },
        {
          "word": "outer marker"
        }
      ],
      "glosses": [
        "An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "hypernyms": [
        {
          "word": "marker beacon"
        }
      ],
      "id": "en-fan_marker-en-noun-KOc8girZ",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "obsolescent",
          "obsolescent"
        ],
        [
          "marker beacon",
          "marker beacon"
        ],
        [
          "en route",
          "en route"
        ],
        [
          "airway",
          "airway"
        ],
        [
          "non-precision approach",
          "non-precision approach"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation) An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "synonyms": [
        {
          "word": "FM"
        }
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "fan marker"
}

{
  "coordinate_terms": [
    {
      "word": "inner marker"
    },
    {
      "word": "middle marker"
    },
    {
      "word": "outer marker"
    }
  ],
  "forms": [
    {
      "form": "fan markers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fan marker (plural fan markers)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "marker beacon"
    }
  ],
  "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",
        "en:Aviation",
        "en:Navigation"
      ],
      "glosses": [
        "An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "obsolescent",
          "obsolescent"
        ],
        [
          "marker beacon",
          "marker beacon"
        ],
        [
          "en route",
          "en route"
        ],
        [
          "airway",
          "airway"
        ],
        [
          "non-precision approach",
          "non-precision approach"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation) An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "FM"
    }
  ],
  "word": "fan marker"
}