"73" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Interjections en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(1859) Du 92 Code de la Western Union."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "intj",
  "pos_title": "Interjection",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en anglais à traduire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en anglais des télécommunications",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1=The Commercial Telegraphers’ Journal: The Official Organ of the Commercial Telegraphers Union of America, vol. 28-30, 1930, page 92",
          "text": "Wonder how far a labor organization would get if they applied to the R. F. C. for help??? 73s—and—30."
        },
        {
          "ref": "1=Hal Travers,Voyage Sixty-nine, 1967, page 97",
          "text": "“[…] Once again best 73, 88. So long, Mary.”"
        }
      ],
      "glosses": [
        "Abréviation de best regards."
      ],
      "id": "fr-73-en-intj-pnNHTcC3",
      "note": "Il y a des variantes orthographiques comme best 73s",
      "topics": [
        "telecommunications"
      ]
    }
  ],
  "sounds": [
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      "audio": "LL-Q1860 (eng)-Back ache-73.wav",
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  "word": "73"
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{
  "categories": [
    "Interjections en anglais",
    "Lemmes en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "(1859) Du 92 Code de la Western Union."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "intj",
  "pos_title": "Interjection",
  "senses": [
    {
      "categories": [
        "Exemples en anglais",
        "Exemples en anglais à traduire",
        "Lexique en anglais des télécommunications"
      ],
      "examples": [
        {
          "ref": "1=The Commercial Telegraphers’ Journal: The Official Organ of the Commercial Telegraphers Union of America, vol. 28-30, 1930, page 92",
          "text": "Wonder how far a labor organization would get if they applied to the R. F. C. for help??? 73s—and—30."
        },
        {
          "ref": "1=Hal Travers,Voyage Sixty-nine, 1967, page 97",
          "text": "“[…] Once again best 73, 88. So long, Mary.”"
        }
      ],
      "glosses": [
        "Abréviation de best regards."
      ],
      "note": "Il y a des variantes orthographiques comme best 73s",
      "topics": [
        "telecommunications"
      ]
    }
  ],
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  "word": "73"
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