"â" meaning in Neapolitan

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "alla"
      },
      "expansion": "Italian alla",
      "name": "cog"
    }
  ],
  "etymology_text": "Compare Italian alla.",
  "head_templates": [
    {
      "args": {
        "1": "nap",
        "2": "contraction",
        "3": "used with feminine singular nouns"
      },
      "expansion": "â (used with feminine singular nouns)",
      "name": "head"
    }
  ],
  "lang": "Neapolitan",
  "lang_code": "nap",
  "pos": "contraction",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "to the",
          "word": "a 'a"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Neapolitan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Contraction of a 'a (“to the”)."
      ],
      "id": "en-â-nap-contraction-L06Fni2k",
      "links": [
        [
          "a",
          "a#Neapolitan"
        ],
        [
          "'a",
          "'a#Neapolitan"
        ]
      ],
      "related": [
        {
          "word": "ê"
        },
        {
          "word": "ô"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction"
      ]
    }
  ],
  "word": "â"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "alla"
      },
      "expansion": "Italian alla",
      "name": "cog"
    }
  ],
  "etymology_text": "Compare Italian alla.",
  "head_templates": [
    {
      "args": {
        "1": "nap",
        "2": "contraction",
        "3": "used with feminine singular nouns"
      },
      "expansion": "â (used with feminine singular nouns)",
      "name": "head"
    }
  ],
  "lang": "Neapolitan",
  "lang_code": "nap",
  "pos": "contraction",
  "related": [
    {
      "word": "ê"
    },
    {
      "word": "ô"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "extra": "to the",
          "word": "a 'a"
        }
      ],
      "categories": [
        "Neapolitan contractions",
        "Neapolitan entries with incorrect language header",
        "Neapolitan non-lemma forms"
      ],
      "glosses": [
        "Contraction of a 'a (“to the”)."
      ],
      "links": [
        [
          "a",
          "a#Neapolitan"
        ],
        [
          "'a",
          "'a#Neapolitan"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction"
      ]
    }
  ],
  "word": "â"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: used with feminine singular nouns",
  "path": [
    "â"
  ],
  "section": "Neapolitan",
  "subsection": "contraction",
  "title": "â",
  "trace": ""
}