What does Populusque mean in Latin?
Populusque is compounded from the nominative noun Populus, "the People", and -que, an enclitic particle meaning "and" which connects the two nominative nouns. The last word, Rōmānus ("Roman"), is an adjective modifying the whole of Senātus Populusque: the "Roman Senate and People", taken as a whole.
What does the Q in SPQR stand for?
Upon the triumphal arches, the altars, and the coins of Rome, SPQR stood for Senatus Populusque Romanus (the Senate and the Roman people). In antiquity, it was a shorthand means of signifying the entirety of the Roman state by referencing its two component parts: Rome's Senate and her people.