"OII" meaning in Translingual

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "O_(II) emission line",
            "3": "OII emission line",
            "4": "O-II emission line",
            "5": "O II emission line"
          },
          "expansion": "English: O_(II) emission line, OII emission line, O-II emission line, O II emission line",
          "name": "desc"
        }
      ],
      "text": "English: O_(II) emission line, OII emission line, O-II emission line, O II emission line"
    }
  ],
  "etymology_text": "O (“oxygen”)+II (“2”)",
  "forms": [
    {
      "form": "O_(II)",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "head": "O_(II)"
      },
      "expansion": "O_(II)",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Chemistry",
          "orig": "mul:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Spectroscopy",
          "orig": "mul:Spectroscopy",
          "parents": [
            "Analytical chemistry",
            "Optics",
            "Physics",
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "singly-ionized oxygen; an atomic oxygen ion needing 1 electron to become neutral"
      ],
      "id": "en-OII-mul-symbol-8hz68N6S",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "spectroscopy",
          "spectroscopy"
        ]
      ],
      "qualifier": "spectroscopy",
      "raw_glosses": [
        "(chemistry, spectroscopy) singly-ionized oxygen; an atomic oxygen ion needing 1 electron to become neutral"
      ],
      "related": [
        {
          "english": "doubly-ionized atomic oxygen",
          "word": "OIII"
        },
        {
          "english": "neutral atomic oxygen",
          "word": "OI"
        },
        {
          "english": "oxygen",
          "word": "O"
        },
        {
          "english": "dioxygen, molecular oxygen",
          "word": "O2"
        }
      ],
      "synonyms": [
        {
          "word": "O+"
        },
        {
          "word": "O1+"
        },
        {
          "word": "O-II"
        },
        {
          "word": "O II"
        }
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "OII"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "O_(II) emission line",
            "3": "OII emission line",
            "4": "O-II emission line",
            "5": "O II emission line"
          },
          "expansion": "English: O_(II) emission line, OII emission line, O-II emission line, O II emission line",
          "name": "desc"
        }
      ],
      "text": "English: O_(II) emission line, OII emission line, O-II emission line, O II emission line"
    }
  ],
  "etymology_text": "O (“oxygen”)+II (“2”)",
  "forms": [
    {
      "form": "O_(II)",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "head": "O_(II)"
      },
      "expansion": "O_(II)",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "related": [
    {
      "english": "doubly-ionized atomic oxygen",
      "word": "OIII"
    },
    {
      "english": "neutral atomic oxygen",
      "word": "OI"
    },
    {
      "english": "oxygen",
      "word": "O"
    },
    {
      "english": "dioxygen, molecular oxygen",
      "word": "O2"
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual symbols",
        "mul:Chemistry",
        "mul:Spectroscopy"
      ],
      "glosses": [
        "singly-ionized oxygen; an atomic oxygen ion needing 1 electron to become neutral"
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "spectroscopy",
          "spectroscopy"
        ]
      ],
      "qualifier": "spectroscopy",
      "raw_glosses": [
        "(chemistry, spectroscopy) singly-ionized oxygen; an atomic oxygen ion needing 1 electron to become neutral"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "O+"
    },
    {
      "word": "O1+"
    },
    {
      "word": "O-II"
    },
    {
      "word": "O II"
    }
  ],
  "word": "OII"
}