"doubling cube" meaning in English

{
  "forms": [
    {
      "form": "doubling cubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "doubling cube (plural doubling cubes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Backgammon",
          "orig": "en:Backgammon",
          "parents": [
            "Board games",
            "Tabletop games",
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A cube used to record the number of points at stake in a game, bearing on its six sides the powers of two from 2 to 64."
      ],
      "id": "en-doubling_cube-en-noun-m36BaTt6",
      "links": [
        [
          "backgammon",
          "backgammon"
        ],
        [
          "cube",
          "cube"
        ],
        [
          "power",
          "power"
        ],
        [
          "two",
          "two"
        ]
      ],
      "raw_glosses": [
        "(backgammon) A cube used to record the number of points at stake in a game, bearing on its six sides the powers of two from 2 to 64."
      ],
      "topics": [
        "backgammon",
        "games"
      ]
    }
  ],
  "word": "doubling cube"
}

{
  "forms": [
    {
      "form": "doubling cubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "doubling cube (plural doubling cubes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Backgammon"
      ],
      "glosses": [
        "A cube used to record the number of points at stake in a game, bearing on its six sides the powers of two from 2 to 64."
      ],
      "links": [
        [
          "backgammon",
          "backgammon"
        ],
        [
          "cube",
          "cube"
        ],
        [
          "power",
          "power"
        ],
        [
          "two",
          "two"
        ]
      ],
      "raw_glosses": [
        "(backgammon) A cube used to record the number of points at stake in a game, bearing on its six sides the powers of two from 2 to 64."
      ],
      "topics": [
        "backgammon",
        "games"
      ]
    }
  ],
  "word": "doubling cube"
}