"ㆍ" meaning in Korean

{
  "etymology_text": "Invented by Sejong the Great of Joseon to represent the Sun.",
  "forms": [
    {
      "form": "a",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "letter",
        "rv": "a"
      },
      "expansion": "ㆍ • (a)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "_dis": "69 31",
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "72 28",
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A former vowel which merged phonetically with /ɨ~ɯ/ word-internally in late Middle Korean and with /a/ word-initially in the late eighteenth century; in the orthography, it continued to be used until the major spelling reforms of the 1930s eliminated it."
      ],
      "id": "en-ㆍ-ko-character-R9ZbVxvM",
      "raw_glosses": [
        "(obsolete) A former vowel which merged phonetically with /ɨ~ɯ/ word-internally in late Middle Korean and with /a/ word-initially in the late eighteenth century; in the orthography, it continued to be used until the major spelling reforms of the 1930s eliminated it."
      ],
      "tags": [
        "letter",
        "obsolete"
      ]
    },
    {
      "glosses": [
        "Used instead of ㅏ (a) in order to give an antique flair in advertising, brand names, etc., even when etymologically spurious."
      ],
      "id": "en-ㆍ-ko-character-vP4ywQgJ",
      "links": [
        [
          "ㅏ",
          "ㅏ#Korean"
        ]
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɨ~ɯ/"
    },
    {
      "ipa": "/ʌ/"
    },
    {
      "ipa": "/a/"
    }
  ],
  "word": "ㆍ"
}

{
  "categories": [
    "Korean entries with incorrect language header",
    "Korean lemmas",
    "Korean letters",
    "Korean terms with IPA pronunciation",
    "Korean terms with redundant script codes",
    "Korean terms without ko-IPA template"
  ],
  "etymology_text": "Invented by Sejong the Great of Joseon to represent the Sun.",
  "forms": [
    {
      "form": "a",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "letter",
        "rv": "a"
      },
      "expansion": "ㆍ • (a)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Korean terms with obsolete senses"
      ],
      "glosses": [
        "A former vowel which merged phonetically with /ɨ~ɯ/ word-internally in late Middle Korean and with /a/ word-initially in the late eighteenth century; in the orthography, it continued to be used until the major spelling reforms of the 1930s eliminated it."
      ],
      "raw_glosses": [
        "(obsolete) A former vowel which merged phonetically with /ɨ~ɯ/ word-internally in late Middle Korean and with /a/ word-initially in the late eighteenth century; in the orthography, it continued to be used until the major spelling reforms of the 1930s eliminated it."
      ],
      "tags": [
        "letter",
        "obsolete"
      ]
    },
    {
      "glosses": [
        "Used instead of ㅏ (a) in order to give an antique flair in advertising, brand names, etc., even when etymologically spurious."
      ],
      "links": [
        [
          "ㅏ",
          "ㅏ#Korean"
        ]
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɨ~ɯ/"
    },
    {
      "ipa": "/ʌ/"
    },
    {
      "ipa": "/a/"
    }
  ],
  "word": "ㆍ"
}