"fg" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "fg",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "an SI unit of mass equal to 10⁻¹⁵ grams",
          "word": "femtogram"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Symbols for SI units",
          "parents": [
            "SI units",
            "Units of measure",
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "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": "Metrology",
          "orig": "mul:Metrology",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1997, Recent Advances in Prostaglandin, Thromboxane, and Leukotriene Research (in English):",
          "text": "Using the same conjugate, but this time in the normal 2 hour assay format we can measure below 100 fg/mL, or about 10 fg per sample.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Symbol for femtogram, an SI unit of mass equal to 10⁻¹⁵ grams."
      ],
      "id": "en-fg-mul-symbol-3LeHiB3y",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "femtogram",
          "femtogram"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "gram",
          "gram"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for femtogram, an SI unit of mass equal to 10⁻¹⁵ grams."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "fg"
}

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "fg",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "an SI unit of mass equal to 10⁻¹⁵ grams",
          "word": "femtogram"
        }
      ],
      "categories": [
        "Pages with 3 entries",
        "Pages with entries",
        "Symbols for SI units",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual symbols",
        "Translingual terms with quotations",
        "mul:Metrology"
      ],
      "examples": [
        {
          "ref": "1997, Recent Advances in Prostaglandin, Thromboxane, and Leukotriene Research (in English):",
          "text": "Using the same conjugate, but this time in the normal 2 hour assay format we can measure below 100 fg/mL, or about 10 fg per sample.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Symbol for femtogram, an SI unit of mass equal to 10⁻¹⁵ grams."
      ],
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "femtogram",
          "femtogram"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "gram",
          "gram"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for femtogram, an SI unit of mass equal to 10⁻¹⁵ grams."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "fg"
}