"◌̃" meaning in Middle French

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "diacritical mark"
      },
      "expansion": "◌̃",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Middle French diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle French links with redundant target parameters",
          "parents": [
            "Links with redundant target parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle French terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "an",
          "text": "ã"
        },
        {
          "english": "en",
          "text": "ẽ"
        }
      ],
      "glosses": [
        "Written on a letter, usually a vowel, in place of an omitted n or m."
      ],
      "id": "en-◌̃-frm-character-K3-c53rH",
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̃"
}

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "diacritical mark"
      },
      "expansion": "◌̃",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Middle French diacritical marks",
        "Middle French entries with incorrect language header",
        "Middle French lemmas",
        "Middle French links with redundant target parameters",
        "Middle French terms in nonstandard scripts"
      ],
      "examples": [
        {
          "english": "an",
          "text": "ã"
        },
        {
          "english": "en",
          "text": "ẽ"
        }
      ],
      "glosses": [
        "Written on a letter, usually a vowel, in place of an omitted n or m."
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̃"
}