"39" meaning in Japanese

{
  "categories": [
    {
      "_dis": "0 0",
      "kind": "other",
      "name": "Japanese number homophones",
      "parents": [],
      "source": "w+disamb"
    }
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "en",
        "3": "thank you"
      },
      "expansion": "English thank you",
      "name": "der"
    }
  ],
  "etymology_text": "From English thank you. 3 is read as san, and 9 is read as kyū.",
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "redirects": [
    "サンキュー"
  ],
  "senses": [
    {
      "id": "en-39-ja-character-47DEQpj8",
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "39"
}

{
  "categories": [
    {
      "_dis": "0 0",
      "kind": "other",
      "name": "Japanese number homophones",
      "parents": [],
      "source": "w+disamb"
    }
  ],
  "etymology_number": 2,
  "etymology_text": "From the name 未来. 3 is read as mi, and 9 is read as ku.",
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "redirects": [
    "未来"
  ],
  "senses": [
    {
      "id": "en-39-ja-character-47DEQpj81",
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "39"
}

{
  "categories": [
    "Japanese number homophones",
    "Japanese terms derived from English"
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "en",
        "3": "thank you"
      },
      "expansion": "English thank you",
      "name": "der"
    }
  ],
  "etymology_text": "From English thank you. 3 is read as san, and 9 is read as kyū.",
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "redirects": [
    "サンキュー"
  ],
  "senses": [
    {
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "39"
}

{
  "categories": [
    "Japanese number homophones"
  ],
  "etymology_number": 2,
  "etymology_text": "From the name 未来. 3 is read as mi, and 9 is read as ku.",
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "character",
  "redirects": [
    "未来"
  ],
  "senses": [
    {
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "39"
}