"◌̈" meaning in Portuguese

{
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 15 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Portuguese 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": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Portuguese terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Portuguese terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A diacritical mark of the Latin script, called trema (“trema”) in Portuguese, and found on Ü/ü."
      ],
      "id": "en-◌̈-pt-character-ZVttKOpr",
      "links": [
        [
          "diacritical mark",
          "diacritical mark"
        ],
        [
          "trema",
          "trema#Portuguese"
        ],
        [
          "Ü",
          "Ü#Portuguese"
        ],
        [
          "ü",
          "ü#Portuguese"
        ]
      ],
      "raw_glosses": [
        "(obsolete) A diacritical mark of the Latin script, called trema (“trema”) in Portuguese, and found on Ü/ü."
      ],
      "tags": [
        "diacritic",
        "obsolete"
      ]
    }
  ],
  "word": "◌̈"
}

{
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Pages with 15 entries",
        "Pages with entries",
        "Portuguese diacritical marks",
        "Portuguese entries with incorrect language header",
        "Portuguese lemmas",
        "Portuguese terms in nonstandard scripts",
        "Portuguese terms with obsolete senses",
        "Portuguese terms with redundant script codes"
      ],
      "glosses": [
        "A diacritical mark of the Latin script, called trema (“trema”) in Portuguese, and found on Ü/ü."
      ],
      "links": [
        [
          "diacritical mark",
          "diacritical mark"
        ],
        [
          "trema",
          "trema#Portuguese"
        ],
        [
          "Ü",
          "Ü#Portuguese"
        ],
        [
          "ü",
          "ü#Portuguese"
        ]
      ],
      "raw_glosses": [
        "(obsolete) A diacritical mark of the Latin script, called trema (“trema”) in Portuguese, and found on Ü/ü."
      ],
      "tags": [
        "diacritic",
        "obsolete"
      ]
    }
  ],
  "word": "◌̈"
}