"`period`" meaning in Greek

{
  "lang": "Greek",
  "lang_code": "el",
  "original_title": "Unsupported titles/`period`",
  "pos": "character",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Ε"
        }
      ],
      "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"
        },
        {
          "kind": "other",
          "name": "Greek terms with non-redundant manual script codes",
          "parents": [
            "Terms with non-redundant manual script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Greek terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using bad params when calling Template:el-morse letter",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Visual rendering of Morse code for Ε."
      ],
      "id": "en-`period`-el-character-eBb00tlI",
      "links": [
        [
          "Ε",
          "Ε#Translingual"
        ]
      ],
      "tags": [
        "alt-of",
        "letter",
        "morse-code",
        "visual-rendering"
      ]
    }
  ],
  "word": "`period`"
}

{
  "lang": "Greek",
  "lang_code": "el",
  "original_title": "Unsupported titles/`period`",
  "pos": "character",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Ε"
        }
      ],
      "categories": [
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek letters",
        "Greek terms in nonstandard scripts",
        "Greek terms with non-redundant manual script codes",
        "Greek terms with non-redundant non-automated sortkeys",
        "Pages using bad params when calling Template:el-morse letter",
        "Pages with raw sortkeys"
      ],
      "glosses": [
        "Visual rendering of Morse code for Ε."
      ],
      "links": [
        [
          "Ε",
          "Ε#Translingual"
        ]
      ],
      "tags": [
        "alt-of",
        "letter",
        "morse-code",
        "visual-rendering"
      ]
    }
  ],
  "word": "`period`"
}