"hex key" meaning in English

{
  "forms": [
    {
      "form": "hex keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hex key (plural hex keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Tools",
          "orig": "en:Tools",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hex head wrench."
      ],
      "id": "en-hex_key-en-noun-FoTRe7X0",
      "links": [
        [
          "hex head wrench",
          "hex head wrench"
        ]
      ],
      "related": [
        {
          "word": "Allen screw"
        },
        {
          "word": "Allen bolt"
        }
      ],
      "synonyms": [
        {
          "word": "Allen key"
        },
        {
          "word": "Allen wrench"
        },
        {
          "word": "hex head wrench"
        }
      ],
      "wikipedia": [
        "hex key"
      ]
    }
  ],
  "word": "hex key"
}

{
  "forms": [
    {
      "form": "hex keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hex key (plural hex keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Allen screw"
    },
    {
      "word": "Allen bolt"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Tools"
      ],
      "glosses": [
        "A hex head wrench."
      ],
      "links": [
        [
          "hex head wrench",
          "hex head wrench"
        ]
      ],
      "synonyms": [
        {
          "word": "Allen key"
        },
        {
          "word": "Allen wrench"
        },
        {
          "word": "hex head wrench"
        }
      ],
      "wikipedia": [
        "hex key"
      ]
    }
  ],
  "word": "hex key"
}