"ΥΓ." meaning in Greek

{
  "etymology_templates": [
    {
      "args": {
        "1": "el",
        "2": "υστερόγραφο",
        "3": "postscript",
        "lit": "after-writing"
      },
      "expansion": "Abbreviation of postscript (literally “after-writing”).",
      "name": "abbreviation of"
    }
  ],
  "etymology_text": "Abbreviation of postscript (literally “after-writing”).",
  "forms": [
    {
      "form": "YG.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "noun"
      },
      "expansion": "ΥΓ. • (YG.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Greek terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "PS"
      ],
      "id": "en-ΥΓ.-el-noun-3RzT1goo",
      "links": [
        [
          "PS",
          "PS#English"
        ]
      ]
    }
  ],
  "word": "ΥΓ."
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "el",
        "2": "υστερόγραφο",
        "3": "postscript",
        "lit": "after-writing"
      },
      "expansion": "Abbreviation of postscript (literally “after-writing”).",
      "name": "abbreviation of"
    }
  ],
  "etymology_text": "Abbreviation of postscript (literally “after-writing”).",
  "forms": [
    {
      "form": "YG.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "noun"
      },
      "expansion": "ΥΓ. • (YG.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Greek abbreviations",
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek nouns",
        "Greek terms in nonstandard scripts",
        "Greek terms spelled with ."
      ],
      "glosses": [
        "PS"
      ],
      "links": [
        [
          "PS",
          "PS#English"
        ]
      ]
    }
  ],
  "word": "ΥΓ."
}