"SSSR" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "СССР",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "m"
      },
      "expansion": "SSSR m (Cyrillic spelling СССР)",
      "name": "sh-proper noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "the USSR",
          "word": "Savez Sovjetskih Socijalističkih Republika"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian terms with 3 consecutive instances of the same letter",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "sh",
          "name": "Countries",
          "orig": "sh:Countries",
          "parents": [
            "Polities",
            "Places",
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Savez Sovjetskih Socijalističkih Republika (“the USSR”)."
      ],
      "id": "en-SSSR-sh-name-eUfFBmP8",
      "links": [
        [
          "Savez Sovjetskih Socijalističkih Republika",
          "Savez Sovjetskih Socijalističkih Republika#Serbo-Croatian"
        ],
        [
          "USSR",
          "USSR"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "masculine"
      ]
    }
  ],
  "word": "SSSR"
}

{
  "forms": [
    {
      "form": "СССР",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "m"
      },
      "expansion": "SSSR m (Cyrillic spelling СССР)",
      "name": "sh-proper noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "the USSR",
          "word": "Savez Sovjetskih Socijalističkih Republika"
        }
      ],
      "categories": [
        "Pages with 3 entries",
        "Pages with entries",
        "Serbo-Croatian entries with incorrect language header",
        "Serbo-Croatian initialisms",
        "Serbo-Croatian lemmas",
        "Serbo-Croatian links with redundant wikilinks",
        "Serbo-Croatian masculine nouns",
        "Serbo-Croatian proper nouns",
        "Serbo-Croatian terms with 3 consecutive instances of the same letter",
        "sh:Countries"
      ],
      "glosses": [
        "Initialism of Savez Sovjetskih Socijalističkih Republika (“the USSR”)."
      ],
      "links": [
        [
          "Savez Sovjetskih Socijalističkih Republika",
          "Savez Sovjetskih Socijalističkih Republika#Serbo-Croatian"
        ],
        [
          "USSR",
          "USSR"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "masculine"
      ]
    }
  ],
  "word": "SSSR"
}