"specimen signatures" meaning in English

{
  "head_templates": [
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      "args": {
        "1": "en",
        "2": "noun form"
      },
      "expansion": "specimen signatures",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "specimen signature"
        }
      ],
      "glosses": [
        "plural of specimen signature"
      ],
      "id": "en-specimen_signatures-en-noun-7-Q1D1Q~",
      "links": [
        [
          "specimen signature",
          "specimen signature#English"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "specimen signatures"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "noun form"
      },
      "expansion": "specimen signatures",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with incorrect language header",
        "English non-lemma forms",
        "English noun forms"
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      "form_of": [
        {
          "word": "specimen signature"
        }
      ],
      "glosses": [
        "plural of specimen signature"
      ],
      "links": [
        [
          "specimen signature",
          "specimen signature#English"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "specimen signatures"
}