"SPQR" meaning in Latin

{
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "proper noun"
      },
      "expansion": "SPQR",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(“the Roman Senate and People”),",
          "word": "senātus populusque rōmānus"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "(please add an English translation of this quotation)",
          "ref": "203 C.E., Arch of Septimius Severus",
          "text": "S·P·Q·R",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of senātus populusque rōmānus (“the Roman Senate and People”),"
      ],
      "id": "en-SPQR-la-name-GlHGMB0U",
      "links": [
        [
          "senātus populusque rōmānus",
          "senatus populusque romanus#Latin"
        ]
      ],
      "synonyms": [
        {
          "word": "S. P. Q. R."
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "wikipedia": [
        "SPQR"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/seˈnaː.tus po.puˈlus.kʷe roːˈmaː.nus/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[s̠ɛˈnäːt̪ʊs̠ pɔpʊˈɫ̪ʊs̠kʷɛ roːˈmäːnʊs̠]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/seˈna.tus po.puˈlus.kwe roˈma.nus/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[seˈnäːt̪us popuˈluskwe roˈmäːnus]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "SPQR"
}

{
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "proper noun"
      },
      "expansion": "SPQR",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(“the Roman Senate and People”),",
          "word": "senātus populusque rōmānus"
        }
      ],
      "categories": [
        "Latin entries with incorrect language header",
        "Latin initialisms",
        "Latin lemmas",
        "Latin proper nouns",
        "Latin terms with IPA pronunciation",
        "Latin terms with quotations",
        "Requests for translations of Latin quotations"
      ],
      "examples": [
        {
          "english": "(please add an English translation of this quotation)",
          "ref": "203 C.E., Arch of Septimius Severus",
          "text": "S·P·Q·R",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of senātus populusque rōmānus (“the Roman Senate and People”),"
      ],
      "links": [
        [
          "senātus populusque rōmānus",
          "senatus populusque romanus#Latin"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "wikipedia": [
        "SPQR"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/seˈnaː.tus po.puˈlus.kʷe roːˈmaː.nus/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[s̠ɛˈnäːt̪ʊs̠ pɔpʊˈɫ̪ʊs̠kʷɛ roːˈmäːnʊs̠]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/seˈna.tus po.puˈlus.kwe roˈma.nus/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[seˈnäːt̪us popuˈluskwe roˈmäːnus]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "synonyms": [
    {
      "word": "S. P. Q. R."
    }
  ],
  "word": "SPQR"
}