"мм" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "миллиме́тр"
      },
      "expansion": "Abbreviation of миллиме́тр (millimétr)",
      "name": "abbrev"
    }
  ],
  "etymology_text": "Abbreviation of миллиме́тр (millimétr).",
  "forms": [
    {
      "form": "mm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "",
        "2": "m-in",
        "3": "-"
      },
      "expansion": "мм • (mm) m inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "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"
        }
      ],
      "glosses": [
        "mm, millimeter"
      ],
      "id": "en-мм-ru-noun-QSN5FT7M",
      "links": [
        [
          "mm",
          "mm"
        ],
        [
          "millimeter",
          "millimeter"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[mʲɪlʲɪˈmʲetr]"
    }
  ],
  "word": "мм"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "миллиме́тр"
      },
      "expansion": "Abbreviation of миллиме́тр (millimétr)",
      "name": "abbrev"
    }
  ],
  "etymology_text": "Abbreviation of миллиме́тр (millimétr).",
  "forms": [
    {
      "form": "mm",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "",
        "2": "m-in",
        "3": "-"
      },
      "expansion": "мм • (mm) m inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Russian 3-syllable words",
        "Russian abbreviations",
        "Russian entries with incorrect language header",
        "Russian inanimate nouns",
        "Russian indeclinable nouns",
        "Russian lemmas",
        "Russian masculine nouns",
        "Russian nouns",
        "Russian terms with IPA pronunciation",
        "Russian terms with redundant head parameter",
        "ru:Units of measure"
      ],
      "glosses": [
        "mm, millimeter"
      ],
      "links": [
        [
          "mm",
          "mm"
        ],
        [
          "millimeter",
          "millimeter"
        ]
      ],
      "tags": [
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[mʲɪlʲɪˈmʲetr]"
    }
  ],
  "word": "мм"
}