SPQR is the acronym of a phrase in Latin: Senātus Populusque Rōmānus translated as The Senate and People of Rome. After defeating Tarquin, the last Roman king, the people started a new type of government, a Republic. As a publicity campaign, and as propaganda, the new Senate had the letters SPQR chiseled, branded and stamped on everything that they controlled.  Public buildings, new coins, and even park benches got the letters SPQR added to them. Today SPQR is still the municipal symbol of the city of Rome.