"XRR" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "XRR",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "X-ray reflectivity"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Spectroscopy",
          "orig": "en:Spectroscopy",
          "parents": [
            "Analytical chemistry",
            "Optics",
            "Physics",
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of X-ray reflectivity."
      ],
      "id": "en-XRR-en-noun-MFlD5ub6",
      "links": [
        [
          "spectroscopy",
          "spectroscopy"
        ],
        [
          "X-ray",
          "X-ray#English"
        ],
        [
          "reflectivity",
          "reflectivity#English"
        ]
      ],
      "qualifier": "spectroscopy",
      "raw_glosses": [
        "(spectroscopy) Initialism of X-ray reflectivity."
      ],
      "related": [
        {
          "word": "XRF"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "XRR"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "XRR",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "XRF"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "word": "X-ray reflectivity"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Spectroscopy"
      ],
      "glosses": [
        "Initialism of X-ray reflectivity."
      ],
      "links": [
        [
          "spectroscopy",
          "spectroscopy"
        ],
        [
          "X-ray",
          "X-ray#English"
        ],
        [
          "reflectivity",
          "reflectivity#English"
        ]
      ],
      "qualifier": "spectroscopy",
      "raw_glosses": [
        "(spectroscopy) Initialism of X-ray reflectivity."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "XRR"
}