Why is the Roman acronym SPQR and not SPR?

SPQR: What does it stand for? In Latin, Senātus means “Senate”, Populusque refers to the people of Rome and Rōmānus is “Roman”. SPQR, therefore, is an abbreviation for the Roman Senate and People.

1. Why does the Roman flag say SPQR?
2. What does the Q in SPQR stand for?
3. Does Italy still use SPQR?
4. When did Rome stop using SPQR?

Why does the Roman flag say SPQR?

In the time of the Roman Republic the Standards were imprinted with the letters SPQR which was an abbreviation for Senatus Populusque Romanus (Senate and People of Rome). The Standard, then, represented not only the legion or cohort which carried it but the citizens of Rome, and the policies the army represented.

What does the Q in SPQR stand for?

The Oxford Classical Dictionary even says SPQR stands for senatus populusque Romanus.

Does Italy still use SPQR?

Even in contemporary usage, SPQR is still used in the municipal coat of arms of Rome and as abbreviation for the comune of Rome in official documents. The Italians have long used a different and humorous expansion of this abbreviation, "Sono Pazzi Questi Romani" (literally: "They're crazy, these Romans").

When did Rome stop using SPQR?

It last appears on coins of Constantine the Great (ruled AD 312-337), the first Christian Roman emperor. The signature continued in use under the Roman Empire.