"гм" meaning in Russian

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "гектоме́тр",
        "3": "",
        "4": "hectometer"
      },
      "expansion": "Abbreviation of гектоме́тр (gektométr, “hectometer”)",
      "name": "abbrev"
    }
  ],
  "etymology_text": "Abbreviation of гектоме́тр (gektométr, “hectometer”).",
  "forms": [
    {
      "form": "gm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "",
        "2": "m-in",
        "3": "-"
      },
      "expansion": "гм • (gm) m inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "7 93",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "16 84",
          "kind": "topical",
          "langcode": "ru",
          "name": "Units of measure",
          "orig": "ru:Units of measure",
          "parents": [
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "hectometer"
      ],
      "id": "en-гм-ru-noun-rODQpKwY",
      "links": [
        [
          "hectometer",
          "hectometer"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɡʲɪktɐˈmʲetr]"
    }
  ],
  "word": "гм"
}

{
  "etymology_number": 2,
  "etymology_text": "Echoic.",
  "forms": [
    {
      "form": "gm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection"
      },
      "expansion": "гм • (gm)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "xm",
          "word": "хм"
        }
      ],
      "glosses": [
        "Alternative form of хм (xm)"
      ],
      "id": "en-гм-ru-intj-df7GxqHg",
      "links": [
        [
          "хм",
          "хм#Russian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[m̥m̩]"
    }
  ],
  "word": "гм"
}

{
  "categories": [
    "Russian 1-syllable words",
    "Russian 3-syllable words",
    "Russian abbreviations",
    "Russian entries with incorrect language header",
    "Russian inanimate nouns",
    "Russian indeclinable nouns",
    "Russian interjections",
    "Russian lemmas",
    "Russian masculine nouns",
    "Russian nouns",
    "Russian terms with IPA pronunciation",
    "Russian terms with redundant head parameter",
    "ru:Units of measure"
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "гектоме́тр",
        "3": "",
        "4": "hectometer"
      },
      "expansion": "Abbreviation of гектоме́тр (gektométr, “hectometer”)",
      "name": "abbrev"
    }
  ],
  "etymology_text": "Abbreviation of гектоме́тр (gektométr, “hectometer”).",
  "forms": [
    {
      "form": "gm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "",
        "2": "m-in",
        "3": "-"
      },
      "expansion": "гм • (gm) m inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "hectometer"
      ],
      "links": [
        [
          "hectometer",
          "hectometer"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɡʲɪktɐˈmʲetr]"
    }
  ],
  "word": "гм"
}

{
  "categories": [
    "Russian 1-syllable words",
    "Russian entries with incorrect language header",
    "Russian interjections",
    "Russian lemmas",
    "Russian terms with IPA pronunciation",
    "ru:Units of measure"
  ],
  "etymology_number": 2,
  "etymology_text": "Echoic.",
  "forms": [
    {
      "form": "gm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection"
      },
      "expansion": "гм • (gm)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "xm",
          "word": "хм"
        }
      ],
      "glosses": [
        "Alternative form of хм (xm)"
      ],
      "links": [
        [
          "хм",
          "хм#Russian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[m̥m̩]"
    }
  ],
  "word": "гм"
}