"X0 system" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "X0 system",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Biology",
          "orig": "en:Biology",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "The system that determines the sex of offspring among grasshoppers, crickets, cockroaches, and some other insects, in which females have two sex cells (XX) and males have only one sex cell (X0, or simply X; the 0 signifies the lack of another X)."
      ],
      "id": "en-X0_system-en-name-LB0ks7c5",
      "links": [
        [
          "biology",
          "biology"
        ],
        [
          "grasshopper",
          "grasshopper"
        ],
        [
          "cricket",
          "cricket"
        ],
        [
          "cockroach",
          "cockroach"
        ],
        [
          "insects",
          "insects"
        ],
        [
          "sex cell",
          "sex cell"
        ],
        [
          "XX",
          "XX"
        ],
        [
          "X0",
          "X0"
        ],
        [
          "X",
          "X"
        ]
      ],
      "raw_glosses": [
        "(biology) The system that determines the sex of offspring among grasshoppers, crickets, cockroaches, and some other insects, in which females have two sex cells (XX) and males have only one sex cell (X0, or simply X; the 0 signifies the lack of another X)."
      ],
      "related": [
        {
          "word": "XY system"
        },
        {
          "word": "ZW system"
        }
      ],
      "topics": [
        "biology",
        "natural-sciences"
      ]
    }
  ],
  "word": "X0 system"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "X0 system",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "XY system"
    },
    {
      "word": "ZW system"
    }
  ],
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    {
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
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        "en:Biology"
      ],
      "glosses": [
        "The system that determines the sex of offspring among grasshoppers, crickets, cockroaches, and some other insects, in which females have two sex cells (XX) and males have only one sex cell (X0, or simply X; the 0 signifies the lack of another X)."
      ],
      "links": [
        [
          "biology",
          "biology"
        ],
        [
          "grasshopper",
          "grasshopper"
        ],
        [
          "cricket",
          "cricket"
        ],
        [
          "cockroach",
          "cockroach"
        ],
        [
          "insects",
          "insects"
        ],
        [
          "sex cell",
          "sex cell"
        ],
        [
          "XX",
          "XX"
        ],
        [
          "X0",
          "X0"
        ],
        [
          "X",
          "X"
        ]
      ],
      "raw_glosses": [
        "(biology) The system that determines the sex of offspring among grasshoppers, crickets, cockroaches, and some other insects, in which females have two sex cells (XX) and males have only one sex cell (X0, or simply X; the 0 signifies the lack of another X)."
      ],
      "topics": [
        "biology",
        "natural-sciences"
      ]
    }
  ],
  "word": "X0 system"
}