"〇" meaning in Japanese

{
  "etymology_number": 1,
  "etymology_text": "Borrowed from English zero.",
  "forms": [
    {
      "form": "〇",
      "ruby": [
        [
          "〇",
          "ゼロ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "symbol",
        "2": "ゼロ"
      },
      "expansion": "〇(ゼロ)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "_dis": "86 14",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "Japanese symbols",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "88 12",
          "kind": "topical",
          "name": "Japanese numeral symbols",
          "parents": [
            "Numeral symbols",
            "Symbols",
            "Letters, symbols, and punctuation",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "english": "July 23, 2007",
          "roman": "nisenshichi nen shichigatsu nijūsannichi",
          "ruby": [
            [
              "二〇〇七",
              "にせんしち"
            ],
            [
              "年",
              "ねん"
            ],
            [
              "七",
              "しち"
            ],
            [
              "月",
              "がつ"
            ],
            [
              "二三",
              "にじゅうさん"
            ],
            [
              "日",
              "にち"
            ]
          ],
          "text": "二〇〇七年七月二三日"
        }
      ],
      "glosses": [
        "Used to write zero in kanji positional notation."
      ],
      "id": "en-〇-ja-symbol-lIC-hFmv",
      "links": [
        [
          "zero",
          "zero#English"
        ],
        [
          "kanji",
          "kanji#English"
        ],
        [
          "positional notation",
          "positional notation#English"
        ]
      ],
      "synonyms": [
        {
          "word": "零"
        }
      ]
    }
  ],
  "word": "〇"
}

{
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "ja",
        "2": "symbol"
      },
      "expansion": "〇",
      "name": "head"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "See ○ for the plain circle."
      ],
      "id": "en-〇-ja-symbol-MNG~9wlZ",
      "links": [
        [
          "○",
          "○#Japanese"
        ]
      ]
    }
  ],
  "word": "〇"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese numeral symbols",
    "Japanese symbols",
    "Japanese terms with redundant sortkeys"
  ],
  "etymology_number": 1,
  "etymology_text": "Borrowed from English zero.",
  "forms": [
    {
      "form": "〇",
      "ruby": [
        [
          "〇",
          "ゼロ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "symbol",
        "2": "ゼロ"
      },
      "expansion": "〇(ゼロ)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Japanese terms with usage examples"
      ],
      "examples": [
        {
          "english": "July 23, 2007",
          "roman": "nisenshichi nen shichigatsu nijūsannichi",
          "ruby": [
            [
              "二〇〇七",
              "にせんしち"
            ],
            [
              "年",
              "ねん"
            ],
            [
              "七",
              "しち"
            ],
            [
              "月",
              "がつ"
            ],
            [
              "二三",
              "にじゅうさん"
            ],
            [
              "日",
              "にち"
            ]
          ],
          "text": "二〇〇七年七月二三日"
        }
      ],
      "glosses": [
        "Used to write zero in kanji positional notation."
      ],
      "links": [
        [
          "zero",
          "zero#English"
        ],
        [
          "kanji",
          "kanji#English"
        ],
        [
          "positional notation",
          "positional notation#English"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "零"
    }
  ],
  "word": "〇"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese numeral symbols",
    "Japanese symbols"
  ],
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "ja",
        "2": "symbol"
      },
      "expansion": "〇",
      "name": "head"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Japanese terms in nonstandard scripts"
      ],
      "glosses": [
        "See ○ for the plain circle."
      ],
      "links": [
        [
          "○",
          "○#Japanese"
        ]
      ]
    }
  ],
  "word": "〇"
}