"Morse key" meaning in English

{
  "forms": [
    {
      "form": "Morse keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Morse key (plural Morse 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 language name categories using raw markup",
          "parents": [
            "Entries with language name 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"
        }
      ],
      "glosses": [
        "A device for transmitting Morse code by hand, still used by radio amateurs today."
      ],
      "id": "en-Morse_key-en-noun-8er20HCP",
      "links": [
        [
          "Morse code",
          "Morse code"
        ],
        [
          "radio amateur",
          "radio amateur"
        ]
      ],
      "synonyms": [
        {
          "word": "telegraph key"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "device for transmitting Morse code",
          "word": "sähkötysavain"
        }
      ],
      "wikipedia": [
        "Telegraph key"
      ]
    }
  ],
  "word": "Morse key"
}

{
  "forms": [
    {
      "form": "Morse keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Morse key (plural Morse keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "A device for transmitting Morse code by hand, still used by radio amateurs today."
      ],
      "links": [
        [
          "Morse code",
          "Morse code"
        ],
        [
          "radio amateur",
          "radio amateur"
        ]
      ],
      "wikipedia": [
        "Telegraph key"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "telegraph key"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "device for transmitting Morse code",
      "word": "sähkötysavain"
    }
  ],
  "word": "Morse key"
}