"DDH" meaning in Salentin

{
  "categories": [
    {
      "kind": "other",
      "name": "Lettres en salentin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Salentin",
      "orig": "salentin",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Salentin",
  "lang_code": "salentin",
  "pos": "character",
  "pos_title": "Lettre",
  "senses": [
    {
      "glosses": [
        "Lettre utilisée dans l'alphabet salentin, parfois utilisée pour exprimer le son cacuminal inversé \\ɖɖ\\, alternative à ḍḍ."
      ],
      "id": "fr-DDH-salentin-character-Ytc1TKbE"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɖɖ\\"
    }
  ],
  "tags": [
    "letter"
  ],
  "word": "DDH"
}

{
  "categories": [
    "Lettres en salentin",
    "salentin"
  ],
  "lang": "Salentin",
  "lang_code": "salentin",
  "pos": "character",
  "pos_title": "Lettre",
  "senses": [
    {
      "glosses": [
        "Lettre utilisée dans l'alphabet salentin, parfois utilisée pour exprimer le son cacuminal inversé \\ɖɖ\\, alternative à ḍḍ."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɖɖ\\"
    }
  ],
  "tags": [
    "letter"
  ],
  "word": "DDH"
}