"ַ" meaning in Hebrew

{
  "head_templates": [
    {
      "args": {
        "1": "he",
        "2": "diacritical mark",
        "sc": "Hebr",
        "tr": "a"
      },
      "expansion": "ַ • (a)",
      "name": "head"
    }
  ],
  "lang": "Hebrew",
  "lang_code": "he",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Hebrew diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Hebrew entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Hebrew terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The niqqud point pataḥ."
      ],
      "id": "en-ַ-he-character-ZFILN9HJ",
      "links": [
        [
          "niqqud",
          "niqqud"
        ],
        [
          "pataḥ",
          "פתח"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "ַ"
}

{
  "head_templates": [
    {
      "args": {
        "1": "he",
        "2": "diacritical mark",
        "sc": "Hebr",
        "tr": "a"
      },
      "expansion": "ַ • (a)",
      "name": "head"
    }
  ],
  "lang": "Hebrew",
  "lang_code": "he",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Hebrew diacritical marks",
        "Hebrew entries with incorrect language header",
        "Hebrew lemmas",
        "Hebrew terms with redundant script codes"
      ],
      "glosses": [
        "The niqqud point pataḥ."
      ],
      "links": [
        [
          "niqqud",
          "niqqud"
        ],
        [
          "pataḥ",
          "פתח"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "ַ"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: a",
  "path": [
    "ַ"
  ],
  "section": "Hebrew",
  "subsection": "diacritical mark",
  "title": "ַ",
  "trace": ""
}