"пи" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "пи̑",
      "tags": [
        "canonical",
        "neuter"
      ]
    },
    {
      "form": "pȋ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "n",
        "head": "пи̑"
      },
      "expansion": "пи̑ n (Latin spelling pȋ)",
      "name": "sh-noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "98 2",
          "kind": "topical",
          "langcode": "sh",
          "name": "Greek letter names",
          "orig": "sh:Greek letter names",
          "parents": [
            "Letter names",
            "Letters, symbols, and punctuation",
            "Names",
            "Orthography",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Writing",
            "Fundamental",
            "Nouns",
            "Human behaviour",
            "Language",
            "Lemmas",
            "Human",
            "Communication"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "73 27",
          "kind": "topical",
          "langcode": "sh",
          "name": "Mathematics",
          "orig": "sh:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "pi (Greek letter)"
      ],
      "id": "en-пи-sh-noun-jqAgmFHL",
      "links": [
        [
          "pi",
          "pi"
        ]
      ]
    },
    {
      "glosses": [
        "pi (mathematical constant)"
      ],
      "id": "en-пи-sh-noun-7US6wj72"
    }
  ],
  "sounds": [
    {
      "ipa": "/pîː/"
    }
  ],
  "word": "пи"
}

{
  "categories": [
    "Serbo-Croatian entries with incorrect language header",
    "Serbo-Croatian lemmas",
    "Serbo-Croatian neuter nouns",
    "Serbo-Croatian nouns",
    "Serbo-Croatian terms with IPA pronunciation",
    "sh:Greek letter names",
    "sh:Mathematics"
  ],
  "forms": [
    {
      "form": "пи̑",
      "tags": [
        "canonical",
        "neuter"
      ]
    },
    {
      "form": "pȋ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "n",
        "head": "пи̑"
      },
      "expansion": "пи̑ n (Latin spelling pȋ)",
      "name": "sh-noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "pi (Greek letter)"
      ],
      "links": [
        [
          "pi",
          "pi"
        ]
      ]
    },
    {
      "glosses": [
        "pi (mathematical constant)"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pîː/"
    }
  ],
  "word": "пи"
}