"A2/c" meaning in English

{
  "forms": [
    {
      "form": "c",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "c (plural cs)",
      "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"
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          "source": "w"
        },
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          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military ranks",
          "orig": "en:Military ranks",
          "parents": [
            "Military",
            "Positions of authority",
            "Titles",
            "Society",
            "Leaders",
            "Occupations",
            "People",
            "All topics",
            "Work",
            "Human",
            "Fundamental",
            "Human activity",
            "Human behaviour"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2010, Franklin D. Duke, 21 Years in Blue: Story of Frank's Air Force Career 1951-1972:",
          "text": "I was still a two-striper (A2/c) I couldn't afford phone calls.",
          "type": "quote"
        }
      ],
      "glosses": [
        "airman second class"
      ],
      "id": "en-A2/c-en-noun-zk81BinX",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "airman second class",
          "Airman second class"
        ]
      ],
      "raw_glosses": [
        "(military) airman second class"
      ],
      "synonyms": [
        {
          "word": "A2C"
        },
        {
          "word": "A2/C"
        }
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "word": "A2/c"
}

{
  "forms": [
    {
      "form": "c",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "c (plural cs)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Military ranks"
      ],
      "examples": [
        {
          "ref": "2010, Franklin D. Duke, 21 Years in Blue: Story of Frank's Air Force Career 1951-1972:",
          "text": "I was still a two-striper (A2/c) I couldn't afford phone calls.",
          "type": "quote"
        }
      ],
      "glosses": [
        "airman second class"
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "airman second class",
          "Airman second class"
        ]
      ],
      "raw_glosses": [
        "(military) airman second class"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "A2C"
    },
    {
      "word": "A2/C"
    }
  ],
  "word": "A2/c"
}

{
  "called_from": "form_descriptions/1147",
  "msg": "suspicious related form tags ['canonical']: 'c' in 'c (plural cs)'",
  "path": [
    "A2/c"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "A2/c",
  "trace": ""
}