"R-tree" meaning in English

{
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        "2": "rectangle"
      },
      "expansion": "rectangle",
      "name": "m"
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  ],
  "etymology_text": "The R stands for rectangle.",
  "forms": [
    {
      "form": "R-trees",
      "tags": [
        "plural"
      ]
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  ],
  "head_templates": [
    {
      "args": {
        "head": "R-tree"
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      "expansion": "R-tree (plural R-trees)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "Theory of computing",
          "orig": "en:Theory of computing",
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      ],
      "glosses": [
        "A kind of tree data structure used to group objects by nearness of location, representing them by their minimum bounding rectangles in the next higher level of the tree."
      ],
      "id": "en-R-tree-en-noun-FsvV1nyI",
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        [
          "tree",
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        [
          "data structure",
          "data structure"
        ]
      ],
      "raw_glosses": [
        "(computing theory) A kind of tree data structure used to group objects by nearness of location, representing them by their minimum bounding rectangles in the next higher level of the tree."
      ],
      "related": [
        {
          "word": "Hilbert R-tree"
        },
        {
          "word": "priority R-tree"
        },
        {
          "word": "R* tree"
        },
        {
          "word": "R+ tree"
        }
      ],
      "topics": [
        "computing",
        "computing-theory",
        "engineering",
        "mathematics",
        "natural-sciences",
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    }
  ],
  "word": "R-tree"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "rectangle"
      },
      "expansion": "rectangle",
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  ],
  "etymology_text": "The R stands for rectangle.",
  "forms": [
    {
      "form": "R-trees",
      "tags": [
        "plural"
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  ],
  "head_templates": [
    {
      "args": {
        "head": "R-tree"
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      "expansion": "R-tree (plural R-trees)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Hilbert R-tree"
    },
    {
      "word": "priority R-tree"
    },
    {
      "word": "R* tree"
    },
    {
      "word": "R+ tree"
    }
  ],
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      "glosses": [
        "A kind of tree data structure used to group objects by nearness of location, representing them by their minimum bounding rectangles in the next higher level of the tree."
      ],
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          "computing#Noun"
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          "data structure",
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      "raw_glosses": [
        "(computing theory) A kind of tree data structure used to group objects by nearness of location, representing them by their minimum bounding rectangles in the next higher level of the tree."
      ],
      "topics": [
        "computing",
        "computing-theory",
        "engineering",
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    }
  ],
  "word": "R-tree"
}