"ΕΣΥ" meaning in Greek

{
  "forms": [
    {
      "form": "ESY",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun"
      },
      "expansion": "ΕΣΥ • (ESY)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Ethnikó Sýstima Ygeías, “National Health Service”",
          "word": "Εθνικό Σύστημα Υγείας"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Εθνικό Σύστημα Υγείας (Ethnikó Sýstima Ygeías, “National Health Service”)."
      ],
      "id": "en-ΕΣΥ-el-name-LCgDKEFe",
      "links": [
        [
          "Εθνικό",
          "εθνικός#Greek"
        ],
        [
          "Σύστημα",
          "σύστημα#Greek"
        ],
        [
          "Υγείας",
          "υγεία#Greek"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/eˈsi/"
    }
  ],
  "word": "ΕΣΥ"
}

{
  "forms": [
    {
      "form": "ESY",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proper noun"
      },
      "expansion": "ΕΣΥ • (ESY)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Ethnikó Sýstima Ygeías, “National Health Service”",
          "word": "Εθνικό Σύστημα Υγείας"
        }
      ],
      "categories": [
        "Greek entries with incorrect language header",
        "Greek initialisms",
        "Greek lemmas",
        "Greek proper nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Initialism of Εθνικό Σύστημα Υγείας (Ethnikó Sýstima Ygeías, “National Health Service”)."
      ],
      "links": [
        [
          "Εθνικό",
          "εθνικός#Greek"
        ],
        [
          "Σύστημα",
          "σύστημα#Greek"
        ],
        [
          "Υγείας",
          "υγεία#Greek"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/eˈsi/"
    }
  ],
  "word": "ΕΣΥ"
}