"Sr" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "Sr",
      "name": "head"
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  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Symbols for chemical elements",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Chemical symbol for strontium."
      ],
      "id": "en-Sr-mul-symbol-CcnxV1yO",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "strontium",
          "strontium#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Chemical symbol for strontium."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    },
    {
      "categories": [
        {
          "_dis": "6 7 24 8 55",
          "kind": "other",
          "name": "Pages with 5 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "3 8 21 7 61",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "18 82",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "27 73",
          "kind": "other",
          "langcode": "mul",
          "name": "Alkaline earth metals",
          "orig": "mul:Alkaline earth metals",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Strouhal number"
      ],
      "id": "en-Sr-mul-symbol-OVeGkF4W",
      "links": [
        [
          "Strouhal number",
          "Strouhal number"
        ]
      ]
    }
  ],
  "word": "Sr"
}

{
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    "Pages with 5 entries",
    "Pages with entries",
    "Translingual entries with incorrect language header",
    "Translingual lemmas",
    "Translingual symbols",
    "mul:Alkaline earth metals"
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
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      "expansion": "Sr",
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  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Symbols for chemical elements"
      ],
      "glosses": [
        "Chemical symbol for strontium."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "strontium",
          "strontium#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Chemical symbol for strontium."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    },
    {
      "glosses": [
        "Strouhal number"
      ],
      "links": [
        [
          "Strouhal number",
          "Strouhal number"
        ]
      ]
    }
  ],
  "word": "Sr"
}