"ΕΛΤΑ" meaning in Greek

{
  "forms": [
    {
      "form": "ELTA",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun"
      },
      "expansion": "ΕΛΤΑ • (ELTA)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(Elliniká Tachydromeía), Hellenic Post, the postal service of Greece",
          "word": "Ελληνικά Ταχυδρομεία"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Acronym of Ελληνικά Ταχυδρομεία (Elliniká Tachydromeía), Hellenic Post, the postal service of Greece."
      ],
      "id": "en-ΕΛΤΑ-el-name-wLaHHZx~",
      "links": [
        [
          "Ελληνικά",
          "ελληνικά#Greek"
        ],
        [
          "Ταχυδρομεία",
          "ταχυδρομεία#Greek"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of"
      ]
    }
  ],
  "word": "ΕΛΤΑ"
}

{
  "forms": [
    {
      "form": "ELTA",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun"
      },
      "expansion": "ΕΛΤΑ • (ELTA)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(Elliniká Tachydromeía), Hellenic Post, the postal service of Greece",
          "word": "Ελληνικά Ταχυδρομεία"
        }
      ],
      "categories": [
        "Greek acronyms",
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek proper nouns"
      ],
      "glosses": [
        "Acronym of Ελληνικά Ταχυδρομεία (Elliniká Tachydromeía), Hellenic Post, the postal service of Greece."
      ],
      "links": [
        [
          "Ελληνικά",
          "ελληνικά#Greek"
        ],
        [
          "Ταχυδρομεία",
          "ταχυδρομεία#Greek"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of"
      ]
    }
  ],
  "word": "ΕΛΤΑ"
}