"∏" meaning in Translingual

{
  "etymology_templates": [
    {
      "args": {
        "1": "mul",
        "2": "grc",
        "3": "-"
      },
      "expansion": "Ancient Greek",
      "name": "der"
    }
  ],
  "etymology_text": "From the Ancient Greek letter Π.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "∏",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Mathematics",
          "orig": "mul:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "∏ₙ₌₁³2n=2·4·6=48"
        }
      ],
      "glosses": [
        "A symbol representing a product over a set of terms."
      ],
      "id": "en-∏-mul-symbol-9YYH95IN",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "product",
          "product"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A symbol representing a product over a set of terms."
      ],
      "related": [
        {
          "word": "∑"
        },
        {
          "word": "Π"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "∏"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "mul",
        "2": "grc",
        "3": "-"
      },
      "expansion": "Ancient Greek",
      "name": "der"
    }
  ],
  "etymology_text": "From the Ancient Greek letter Π.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "∏",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "related": [
    {
      "word": "∑"
    },
    {
      "word": "Π"
    }
  ],
  "senses": [
    {
      "categories": [
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual symbols",
        "Translingual terms derived from Ancient Greek",
        "mul:Mathematics"
      ],
      "examples": [
        {
          "text": "∏ₙ₌₁³2n=2·4·6=48"
        }
      ],
      "glosses": [
        "A symbol representing a product over a set of terms."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "product",
          "product"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A symbol representing a product over a set of terms."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "∏"
}