"call letters" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "call letters pl (plural only)",
      "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": "English pluralia tantum",
          "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": "Broadcasting",
          "orig": "en:Broadcasting",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              151,
              162
            ]
          ],
          "ref": "2019 September 17, Edward Snowden, Permanent Record, New York, N.Y.: Metropolitan Books/Henry Holt and Company, →ISBN:",
          "text": "I left my smartphone on the kitchen counter alongside a notepad on which I scribbled in pen: Got called away for work. I love you. I signed it with my call-letter nickname, Echo.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Call sign."
      ],
      "id": "en-call_letters-en-noun-y3kLrAbI",
      "links": [
        [
          "broadcasting",
          "broadcasting#Noun"
        ],
        [
          "Call sign",
          "call sign"
        ]
      ],
      "raw_glosses": [
        "(broadcasting) Call sign."
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "topics": [
        "broadcasting",
        "media"
      ]
    }
  ],
  "word": "call letters"
}

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "call letters pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Broadcasting"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              151,
              162
            ]
          ],
          "ref": "2019 September 17, Edward Snowden, Permanent Record, New York, N.Y.: Metropolitan Books/Henry Holt and Company, →ISBN:",
          "text": "I left my smartphone on the kitchen counter alongside a notepad on which I scribbled in pen: Got called away for work. I love you. I signed it with my call-letter nickname, Echo.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Call sign."
      ],
      "links": [
        [
          "broadcasting",
          "broadcasting#Noun"
        ],
        [
          "Call sign",
          "call sign"
        ]
      ],
      "raw_glosses": [
        "(broadcasting) Call sign."
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "topics": [
        "broadcasting",
        "media"
      ]
    }
  ],
  "word": "call letters"
}

{
  "called_from": "form_description/20250107",
  "msg": "Form tags without form: desc='plural plural-only', tagsets=[('plural', 'plural-only')]",
  "path": [
    "call letters"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "call letters",
  "trace": ""
}