"Pm" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "Pm",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Symbols for chemical elements",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Chemical symbol for promethium."
      ],
      "id": "en-Pm-mul-symbol-mul:Q1809",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "promethium",
          "promethium#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Chemical symbol for promethium."
      ],
      "senseid": [
        "mul:Q1809"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikidata": [
        "Q1809"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(petameter), an SI unit of length equal to 10¹⁵ metres (meters)",
          "word": "petametre"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Symbols for SI units",
          "parents": [
            "Units of measure"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "mul",
          "name": "Metrology",
          "orig": "mul:Metrology",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "24 76",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "23 77",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "34 66",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "38 62",
          "kind": "other",
          "langcode": "mul",
          "name": "Lanthanide series chemical elements",
          "orig": "mul:Lanthanide series chemical elements",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Symbol for petametre (petameter), an SI unit of length equal to 10¹⁵ metres (meters)."
      ],
      "id": "en-Pm-mul-symbol-mul:Q3277919",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "petametre",
          "petametre"
        ],
        [
          "petameter",
          "petameter"
        ],
        [
          "length",
          "length"
        ],
        [
          "metre",
          "metre"
        ],
        [
          "meter",
          "meter"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for petametre (petameter), an SI unit of length equal to 10¹⁵ metres (meters)."
      ],
      "senseid": [
        "mul:Q3277919"
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ],
      "wikidata": [
        "Q3277919"
      ]
    }
  ],
  "word": "Pm"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Translingual entries with incorrect language header",
    "Translingual lemmas",
    "Translingual symbols",
    "mul:Lanthanide series chemical elements"
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "Pm",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Symbols for chemical elements"
      ],
      "glosses": [
        "Chemical symbol for promethium."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "promethium",
          "promethium#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) Chemical symbol for promethium."
      ],
      "senseid": [
        "mul:Q1809"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikidata": [
        "Q1809"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(petameter), an SI unit of length equal to 10¹⁵ metres (meters)",
          "word": "petametre"
        }
      ],
      "categories": [
        "Symbols for SI units",
        "mul:Metrology"
      ],
      "glosses": [
        "Symbol for petametre (petameter), an SI unit of length equal to 10¹⁵ metres (meters)."
      ],
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "petametre",
          "petametre"
        ],
        [
          "petameter",
          "petameter"
        ],
        [
          "length",
          "length"
        ],
        [
          "metre",
          "metre"
        ],
        [
          "meter",
          "meter"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for petametre (petameter), an SI unit of length equal to 10¹⁵ metres (meters)."
      ],
      "senseid": [
        "mul:Q3277919"
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ],
      "wikidata": [
        "Q3277919"
      ]
    }
  ],
  "word": "Pm"
}