"retroflex hook" meaning in English

{
  "forms": [
    {
      "form": "retroflex hooks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "retroflex hook (plural retroflex hooks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Typography",
          "orig": "en:Typography",
          "parents": [
            "Printing",
            "Writing",
            "Industries",
            "Human behaviour",
            "Language",
            "Business",
            "Human",
            "Communication",
            "Economics",
            "Society",
            "All topics",
            "Social sciences",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hamiform diacritic used to mark consonantal retroflexion."
      ],
      "id": "en-retroflex_hook-en-noun-h-i6Nw9C",
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "retroflexion",
          "retroflexion#English"
        ]
      ],
      "raw_glosses": [
        "(typography) A hamiform diacritic used to mark consonantal retroflexion."
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    }
  ],
  "word": "retroflex hook"
}

{
  "forms": [
    {
      "form": "retroflex hooks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "retroflex hook (plural retroflex hooks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Typography"
      ],
      "glosses": [
        "A hamiform diacritic used to mark consonantal retroflexion."
      ],
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "retroflexion",
          "retroflexion#English"
        ]
      ],
      "raw_glosses": [
        "(typography) A hamiform diacritic used to mark consonantal retroflexion."
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    }
  ],
  "word": "retroflex hook"
}