"PTT" meaning in Dutch

{
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "PTT f",
      "name": "nl-proper noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Posterijen"
        },
        {
          "word": "Telegrafie en Telefonie"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Dutch entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Netherlands Dutch",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Posterijen, Telegrafie en Telefonie"
      ],
      "id": "en-PTT-nl-name-6edQu-JV",
      "raw_glosses": [
        "(Netherlands, historical) Initialism of Posterijen, Telegrafie en Telefonie"
      ],
      "tags": [
        "Netherlands",
        "abbreviation",
        "alt-of",
        "feminine",
        "historical",
        "initialism"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/peː.teːˈteː/"
    }
  ],
  "word": "PTT"
}

{
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "PTT f",
      "name": "nl-proper noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Posterijen"
        },
        {
          "word": "Telegrafie en Telefonie"
        }
      ],
      "categories": [
        "Dutch entries with incorrect language header",
        "Dutch feminine nouns",
        "Dutch lemmas",
        "Dutch proper nouns",
        "Dutch terms with historical senses",
        "Netherlands Dutch",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Initialism of Posterijen, Telegrafie en Telefonie"
      ],
      "raw_glosses": [
        "(Netherlands, historical) Initialism of Posterijen, Telegrafie en Telefonie"
      ],
      "tags": [
        "Netherlands",
        "abbreviation",
        "alt-of",
        "feminine",
        "historical",
        "initialism"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/peː.teːˈteː/"
    }
  ],
  "word": "PTT"
}