the Senate and People of Rome.
Origin of S.P.Q.R.
From the Latin word Senātus Populusque Rōmānus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the insignia of Rome, from Latin Senatus Populusque Romanus "the Senate and People of Rome."
Online Etymology Dictionary, © 2010 Douglas Harper