"-is" meaning in Czech

{
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "-is n (noun-forming suffix, indeclinable)",
      "name": "cs-noun"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Měl zahrát gis, ale omylem zahrál ais.",
          "type": "example"
        }
      ],
      "glosses": [
        "indicates a sharp of a note"
      ],
      "id": "en--is-cs-suffix-kwt~EquA",
      "links": [
        [
          "sharp",
          "sharp#English"
        ],
        [
          "note",
          "note#English"
        ]
      ],
      "tags": [
        "indeclinable",
        "morpheme",
        "neuter"
      ]
    }
  ],
  "word": "-is"
}

{
  "categories": [
    "Pages with raw sortkeys"
  ],
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "-is n (noun-forming suffix, indeclinable)",
      "name": "cs-noun"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Czech entries with incorrect language header",
        "Czech indeclinable nouns",
        "Czech lemmas",
        "Czech neuter suffixes",
        "Czech noun-forming suffixes",
        "Czech suffixes",
        "Czech terms with usage examples",
        "Pages with raw sortkeys",
        "Requests for translations of Czech usage examples"
      ],
      "examples": [
        {
          "text": "Měl zahrát gis, ale omylem zahrál ais.",
          "type": "example"
        }
      ],
      "glosses": [
        "indicates a sharp of a note"
      ],
      "links": [
        [
          "sharp",
          "sharp#English"
        ],
        [
          "note",
          "note#English"
        ]
      ],
      "tags": [
        "indeclinable",
        "morpheme",
        "neuter"
      ]
    }
  ],
  "word": "-is"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: noun-forming suffix",
  "path": [
    "-is"
  ],
  "section": "Czech",
  "subsection": "suffix",
  "title": "-is",
  "trace": ""
}