"nu" meaning in Neapolitan

{
  "etymology_templates": [
    {
      "args": {
        "1": "nap",
        "2": "la",
        "3": "ūnus"
      },
      "expansion": "Latin ūnus",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin ūnus.",
  "forms": [
    {
      "form": "'nu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "n'",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "nap",
        "2": "article",
        "g": "m-s"
      },
      "expansion": "nu m sg",
      "name": "head"
    }
  ],
  "lang": "Neapolitan",
  "lang_code": "nap",
  "pos": "article",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Neapolitan articles",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Neapolitan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 73 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "a, an"
      ],
      "id": "en-nu-nap-article-jF9Wbm2d",
      "links": [
        [
          "a",
          "a"
        ],
        [
          "an",
          "an"
        ]
      ],
      "tags": [
        "masculine",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/nu/"
    }
  ],
  "word": "nu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "nap",
        "2": "la",
        "3": "ūnus"
      },
      "expansion": "Latin ūnus",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin ūnus.",
  "forms": [
    {
      "form": "'nu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "n'",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "nap",
        "2": "article",
        "g": "m-s"
      },
      "expansion": "nu m sg",
      "name": "head"
    }
  ],
  "lang": "Neapolitan",
  "lang_code": "nap",
  "pos": "article",
  "senses": [
    {
      "categories": [
        "Neapolitan articles",
        "Neapolitan entries with incorrect language header",
        "Neapolitan lemmas",
        "Neapolitan terms derived from Latin",
        "Neapolitan terms inherited from Latin",
        "Pages with 73 entries",
        "Pages with entries"
      ],
      "glosses": [
        "a, an"
      ],
      "links": [
        [
          "a",
          "a"
        ],
        [
          "an",
          "an"
        ]
      ],
      "tags": [
        "masculine",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/nu/"
    }
  ],
  "word": "nu"
}