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This tattoo comes from the Flickrstream of Geekygirlnyc and is licensed under Creative Commons. This tattoo is really red cuz it's fresh, but still mighty fine.
SPQR stands for Senatus Populusque Romanus which, roughly translated means "The Senate and the People of Rome". This was a phrase that by most accounts became well known not too long after the founding of the Roman Republic but, of course, lost some of its luster under the monarchy when the Senate and public opinion were subjugated by the Caesars and their successors. It appeared on coins, military standards, monuments and countless speeches and documents.