"эр" meaning in Russian

{
  "etymology_number": 1,
  "forms": [
    {
      "form": "er",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "эр",
        "2": "n-in",
        "3": "-"
      },
      "expansion": "эр • (er) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "90 9 1",
          "kind": "other",
          "langcode": "ru",
          "name": "Cyrillic letter names",
          "orig": "ru:Cyrillic letter names",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "48 48 5",
          "kind": "other",
          "langcode": "ru",
          "name": "Letter names",
          "orig": "ru:Letter names",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "The Cyrillic letter Р, р."
      ],
      "id": "en-эр-ru-noun-Zo5LAjU1",
      "links": [
        [
          "Р",
          "р#Russian"
        ],
        [
          "р",
          "р#Russian"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    },
    {
      "categories": [
        {
          "_dis": "11 74 16",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "38 58 4",
          "kind": "other",
          "langcode": "ru",
          "name": "Latin letter names",
          "orig": "ru:Latin letter names",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "48 48 5",
          "kind": "other",
          "langcode": "ru",
          "name": "Letter names",
          "orig": "ru:Letter names",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "The Roman letter R, r."
      ],
      "id": "en-эр-ru-noun-7SOxJnEZ",
      "links": [
        [
          "R",
          "R"
        ],
        [
          "r",
          "r"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛr]"
    }
  ],
  "word": "эр"
}

{
  "etymology_number": 2,
  "forms": [
    {
      "form": "er",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in-p"
      },
      "expansion": "эр • (er) f inan pl",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "extra": "éra",
          "word": "э́ра"
        }
      ],
      "glosses": [
        "genitive plural of э́ра (éra)"
      ],
      "id": "en-эр-ru-noun-k~mJdmw~",
      "links": [
        [
          "э́ра",
          "эра#Russian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛr]"
    }
  ],
  "word": "эр"
}

{
  "categories": [
    "Pages with 13 entries",
    "Pages with entries",
    "Russian 1-syllable words",
    "Russian entries with incorrect language header",
    "Russian inanimate nouns",
    "Russian indeclinable nouns",
    "Russian lemmas",
    "Russian neuter nouns",
    "Russian non-lemma forms",
    "Russian noun forms",
    "Russian nouns",
    "Russian terms with IPA pronunciation",
    "Russian terms with redundant head parameter",
    "ru:Cyrillic letter names",
    "ru:Latin letter names",
    "ru:Letter names",
    "sah:Age",
    "sah:Male family members",
    "sah:Male people",
    "sah:Marriage"
  ],
  "etymology_number": 1,
  "forms": [
    {
      "form": "er",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "эр",
        "2": "n-in",
        "3": "-"
      },
      "expansion": "эр • (er) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "The Cyrillic letter Р, р."
      ],
      "links": [
        [
          "Р",
          "р#Russian"
        ],
        [
          "р",
          "р#Russian"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    },
    {
      "glosses": [
        "The Roman letter R, r."
      ],
      "links": [
        [
          "R",
          "R"
        ],
        [
          "r",
          "r"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛr]"
    }
  ],
  "word": "эр"
}

{
  "categories": [
    "Pages with 13 entries",
    "Pages with entries",
    "Russian 1-syllable words",
    "Russian entries with incorrect language header",
    "Russian non-lemma forms",
    "Russian noun forms",
    "Russian terms with IPA pronunciation",
    "ru:Cyrillic letter names",
    "ru:Latin letter names",
    "ru:Letter names",
    "sah:Age",
    "sah:Male family members",
    "sah:Male people",
    "sah:Marriage"
  ],
  "etymology_number": 2,
  "forms": [
    {
      "form": "er",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in-p"
      },
      "expansion": "эр • (er) f inan pl",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "extra": "éra",
          "word": "э́ра"
        }
      ],
      "glosses": [
        "genitive plural of э́ра (éra)"
      ],
      "links": [
        [
          "э́ра",
          "эра#Russian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɛr]"
    }
  ],
  "word": "эр"
}