"°r" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "Codici e simboli in italiano",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Italiano",
  "lang_code": "it",
  "pos": "symbol",
  "pos_title": "Codice / Simbolo",
  "senses": [
    {
      "glosses": [
        "grado Réaumur"
      ],
      "id": "it-°r-it-symbol-vALOnE1L",
      "topics": [
        "chemistry",
        "physics"
      ]
    }
  ],
  "word": "°r"
}

{
  "categories": [
    "Codici e simboli in italiano"
  ],
  "lang": "Italiano",
  "lang_code": "it",
  "pos": "symbol",
  "pos_title": "Codice / Simbolo",
  "senses": [
    {
      "glosses": [
        "grado Réaumur"
      ],
      "topics": [
        "chemistry",
        "physics"
      ]
    }
  ],
  "word": "°r"
}