"ㄭ" meaning in Chinese

{
  "etymology_templates": [
    {
      "args": {
        "1": "zh",
        "2": "師"
      },
      "expansion": "師／师 (shī)",
      "name": "l"
    }
  ],
  "etymology_text": "Derived from 師／师 (shī).",
  "head_templates": [
    {
      "args": {
        "1": "cmn",
        "2": "letter"
      },
      "expansion": "ㄭ",
      "name": "head"
    }
  ],
  "lang": "Chinese",
  "lang_code": "zh",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mandarin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin zhuyin",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An additional letter of the Zhuyin alphabet."
      ],
      "id": "en-ㄭ-zh-character-dvDhwd6D",
      "tags": [
        "letter"
      ]
    }
  ],
  "word": "ㄭ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "zh",
        "2": "師"
      },
      "expansion": "師／师 (shī)",
      "name": "l"
    }
  ],
  "etymology_text": "Derived from 師／师 (shī).",
  "head_templates": [
    {
      "args": {
        "1": "cmn",
        "2": "letter"
      },
      "expansion": "ㄭ",
      "name": "head"
    }
  ],
  "lang": "Chinese",
  "lang_code": "zh",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Mandarin entries with incorrect language header",
        "Mandarin entries with language name categories using raw markup",
        "Mandarin lemmas",
        "Mandarin letters",
        "Mandarin terms with IPA pronunciation",
        "Mandarin zhuyin"
      ],
      "glosses": [
        "An additional letter of the Zhuyin alphabet."
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "word": "ㄭ"
}