"sign manual" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sign"
      },
      "expansion": "sign",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "manual"
      },
      "expansion": "manual",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "frm",
        "3": "signe"
      },
      "expansion": "Middle French signe",
      "name": "der"
    },
    {
      "args": {
        "1": "frm",
        "2": "manuel"
      },
      "expansion": "manuel",
      "name": "m"
    }
  ],
  "etymology_text": "From sign + manual, probably after Middle French signe manuel.",
  "forms": [
    {
      "form": "signs manual",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "signs manual"
      },
      "expansion": "sign manual (plural signs manual)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1789, Edward Gibbon, Memoirs of My Life, Penguin, published 1990, page 124",
          "text": "We were undeceived by the King's sign manual for our embodying, which was issued May 10th 1760.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An authentic signature; (especially), the signature of a sovereign, used to validate a formal document."
      ],
      "id": "en-sign_manual-en-noun-WJxUd-sj",
      "links": [
        [
          "signature",
          "signature"
        ],
        [
          "sovereign",
          "sovereign"
        ]
      ],
      "wikipedia": [
        "Royal sign-manual"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌsʌɪn ˈmanjʊəl/",
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "sign manual"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sign"
      },
      "expansion": "sign",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "manual"
      },
      "expansion": "manual",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "frm",
        "3": "signe"
      },
      "expansion": "Middle French signe",
      "name": "der"
    },
    {
      "args": {
        "1": "frm",
        "2": "manuel"
      },
      "expansion": "manuel",
      "name": "m"
    }
  ],
  "etymology_text": "From sign + manual, probably after Middle French signe manuel.",
  "forms": [
    {
      "form": "signs manual",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "signs manual"
      },
      "expansion": "sign manual (plural signs manual)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from Middle French",
        "English terms with IPA pronunciation",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1789, Edward Gibbon, Memoirs of My Life, Penguin, published 1990, page 124",
          "text": "We were undeceived by the King's sign manual for our embodying, which was issued May 10th 1760.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An authentic signature; (especially), the signature of a sovereign, used to validate a formal document."
      ],
      "links": [
        [
          "signature",
          "signature"
        ],
        [
          "sovereign",
          "sovereign"
        ]
      ],
      "wikipedia": [
        "Royal sign-manual"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌsʌɪn ˈmanjʊəl/",
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "sign manual"
}