"penna a sfera" meaning in Italian

{
  "forms": [
    {
      "form": "penne a sfera",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "penna a sfera f (plural penne a sfera)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "it",
          "name": "Writing instruments",
          "orig": "it:Writing instruments",
          "parents": [
            "Stationery",
            "Tools",
            "Writing",
            "Technology",
            "Human behaviour",
            "Language",
            "All topics",
            "Human",
            "Communication",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "ballpoint pen, biro"
      ],
      "id": "en-penna_a_sfera-it-noun-Ep4x8yqh",
      "links": [
        [
          "ballpoint pen",
          "ballpoint pen"
        ],
        [
          "biro",
          "biro"
        ]
      ],
      "synonyms": [
        {
          "word": "biro"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "penna a sfera"
}

{
  "forms": [
    {
      "form": "penne a sfera",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "penna a sfera f (plural penne a sfera)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian feminine nouns",
        "Italian lemmas",
        "Italian multiword terms",
        "Italian nouns",
        "it:Writing instruments"
      ],
      "glosses": [
        "ballpoint pen, biro"
      ],
      "links": [
        [
          "ballpoint pen",
          "ballpoint pen"
        ],
        [
          "biro",
          "biro"
        ]
      ],
      "synonyms": [
        {
          "word": "biro"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "penna a sfera"
}